Updated on 2024/10/03

写真a

 
IGARASHI Go
 
Organization
Graduate School of Environmental Studies Department of Environmental Engineering and Architecture Building Structure and Construction Systems Associate professor
Graduate School
Graduate School of Environmental Studies
Undergraduate School
School of Engineering Architecture
Title
Associate professor
External link

Degree 3

  1. Doctor of Engineering ( 2014.3   Nagoya University ) 

  2. Master of Engineering ( 2011.3   Nagoya University ) 

  3. Bachelor of Engineering ( 2009.3   Nagoya University ) 

Research Interests 8

  1. building material

  2. geochemistry

  3. analytical chemistry

  4. cement chemistry

  5. building material

  6. cement chemistry

  7. geochemistry

  8. analytical chemistry

Research Areas 5

  1. Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Building structures and materials  / Cement Concrete Chemistry

  2. Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Building structures and materials  / Building Material

  3. Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Building structures and materials  / Concrete Engineering

  4. Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Building structures and materials  / Building Material

  5. Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Building structures and materials  / Concrete Engineering

Research History 7

  1. Nagoya University   Graduate School of Environmental Studies Department of Environmental Engineering and Architecture   Associate professor

    2022.10

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    Country:Japan

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  2. The University of Tokyo   The Graduate School of Engineering Department of Civil Engineering   Designated lecturer

    2019.4 - 2022.9

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  3. University of Surrey   客員研究員

    2017.1 - 2018.1

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  4. Tohoku University   Assistant Professor

    2014.4 - 2019.3

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  5. Tohoku University   Assistant Professor

    2014.4 - 2019.3

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  6. EMPA(スイス連邦材料研究所)   客員研究員

    2012.5 - 2012.11

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  7. Japan Society for the Promotion of Science

    2011.4 - 2014.3

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Education 6

  1. Nagoya University   環境学研究科   都市環境学専攻

    2011.4 - 2014.3

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    Country: Japan

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  2. Nagoya University   環境学研究科   都市環境学専攻

    2011.4 - 2014.3

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    Country: Japan

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  3. Nagoya University   環境学研究科   都市環境学専攻

    2009.4 - 2011.3

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    Country: Japan

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  4. Nagoya University   環境学研究科   都市環境学専攻

    2009.4 - 2011.3

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    Country: Japan

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  5. Nagoya University   Faculty of Engineering   社会環境工学科

    2005.4 - 2009.3

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    Country: Japan

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  6. Nagoya University   Faculty of Engineering   社会環境工学科

    2005.4 - 2009.3

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    Country: Japan

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Professional Memberships 4

  1. Architectural Institute of Japan (AIJ)

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  2. Japan Concrete Instite (JCI)

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  3. 日本原子力学会

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  4. Japan Society of Civil Engineers (JSCE)

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Committee Memberships 38

  1. 日本コンクリート工学会研究委員会JCI-TC232A「コンクリートのアカデミックデータベースの整理とAIへの活用に関する研究委員会」   委員  

    2023.4   

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    Committee type:Academic society

  2. 日本コンクリート工学会中部支部研究委員会「中部地域の革新的コンクリート技術の拠点想像に関する調査研究委員会」   幹事長  

    2023.4   

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    Committee type:Academic society

  3. 日本建築学会東海支部材料施工委員会   委員  

    2023.4   

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    Committee type:Academic society

  4. 日本建築学会建築工事標準仕様書・同解説 JASS 5N 原子力発電所施設における鉄筋コンクリート工事 改定小委員会   委員  

    2023.4   

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    Committee type:Academic society

  5. 日本材料学会「コンクリート構造物の補修,補強,アップグレード論文報告集」編集委員会   編集委員  

    2023.4   

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    Committee type:Academic society

  6. 日本建築学会建築工事標準仕様書・同解説 JASS 5N 原子力発電所施設における鉄筋コンクリート工事 改定小委員会   委員  

    2023.4   

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    Committee type:Academic society

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  7. 日本材料学会「コンクリート構造物の補修,補強,アップグレード論文報告集」編集委員会   編集委員  

    2023.4   

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    Committee type:Academic society

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  8. 日本コンクリート工学会中部支部研究委員会「中部地域の革新的コンクリート技術の拠点想像に関する調査研究委員会」   幹事長  

    2023.4   

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    Committee type:Academic society

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  9. 日本コンクリート工学会研究委員会JCI-TC232A「コンクリートのアカデミックデータベースの整理とAIへの活用に関する研究委員会」   委員  

    2023.4   

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    Committee type:Academic society

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  10. 日本建築学会東海支部材料施工委員会   委員  

    2023.4   

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  11. 日本コンクリート工学会研究委員会JCI-TC222A「コンクリート中の鉄筋腐食の統一的な取扱いに関する研究委員会」   委員  

    2022.4 - 2024.3   

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    Committee type:Academic society

  12. 日本コンクリート工学会研究委員会JCI-TC222A「コンクリート中の鉄筋腐食の統一的な取扱いに関する研究委員会」   委員  

    2022.4 - 2024.3   

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  13. 日本コンクリート工学会研究委員会JCI-TC224F「コンクリートのアカデミックデータベースの整理とAIへの活用に関するFS委員会」   委員  

    2022.4 - 2023.3   

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    Committee type:Academic society

  14. 日本コンクリート工学会研究委員会JCI-TC224F「コンクリートのアカデミックデータベースの整理とAIへの活用に関するFS委員会」   委員  

    2022.4 - 2023.3   

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    Committee type:Academic society

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  15. 日本コンクリート工学会研究委員会JCI-TC211A「微視的機構に基づくコンクリート構造物中の内部膨張評価と予測に関する研究委員会」   委員  

    2021.4 - 2023.3   

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    Committee type:Academic society

  16. 日本コンクリート工学会研究委員会JCI-TC211A「微視的機構に基づくコンクリート構造物中の内部膨張評価と予測に関する研究委員会」   委員  

    2021.4 - 2023.3   

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    Committee type:Academic society

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  17. 土木学会コンクリート委員会「プレストレストコンクリート黎明期に建設された茂喜登牛水路橋の解体調査研究小委員会(363委員会)」   委員  

    2020.4 - 2023.3   

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    Committee type:Academic society

  18. 土木学会コンクリート委員会「プレストレストコンクリート黎明期に建設された茂喜登牛水路橋の解体調査研究小委員会(363委員会)」   委員  

    2020.4 - 2023.3   

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    Committee type:Academic society

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  19. 日本コンクリート工学会研究委員会JCI-TC202A「コンクリート構造物の構造・耐久性シミュレーションにおける検証と妥当性確認に関する研究委員会」   委員  

    2020.4 - 2022.3   

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  20. 日本コンクリート工学会「コンクリート工学年次論文集」査読委員会   委員  

    2020.4 - 2022.3   

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    Committee type:Academic society

  21. 日本コンクリート工学会「コンクリート工学年次論文集」査読委員会   委員  

    2020.4 - 2022.3   

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  22. 日本コンクリート工学会研究委員会JCI-TC205F「内部膨張反応によるコンクリートの膨張評価と予測に関するFS委員会」   委員  

    2020.4 - 2021.3   

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    Committee type:Academic society

  23. 日本コンクリート工学会研究委員会JCI-TC205F「内部膨張反応によるコンクリートの膨張評価と予測に関するFS委員会」   委員  

    2020.4 - 2021.3   

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  24. 日本学術振興会 産学協力委員会 「レジリエントインフラのための次世代建設材料の創成」 R023委員会   学界委員  

    2020.4   

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    Committee type:Academic society

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  25. 日本学術振興会 産学協力委員会 「レジリエントインフラのための次世代建設材料の創成」 R023委員会   学界委員  

    2020.4   

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    Committee type:Academic society

  26. 日本コンクリート工学会研究委員会JCI-TC191A「中性子線を用いたコンクリートの 検査・診断に関する研究委員会」   委員  

    2019.4 - 2021.3   

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    Committee type:Academic society

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  27. 日本コンクリート工学会研究委員会JCI-TC195F「コンクリート工学における シミュレーションの検証と 妥当性確認に関するFS委員会」   委員  

    2019.4 - 2020.3   

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  28. 日本コンクリート工学会研究委員会JCI-TC-181A「有害廃棄物及び放射性廃棄物の処分へのセメント・コンクリート技術の適用に関する研究委員会」   委員  

    2018.4 - 2020.3   

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    Committee type:Academic society

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  29. 国立研究開発法人物質・材料研究機構セメント解析研究会   委員  

    2017.5 - 2019.3   

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    Committee type:Other

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  30. 日本コンクリート工学会研究委員会JCI-TC173A「エトリンガイトの遅延生成(DEF)に関する研究委員会」   委員  

    2017.4 - 2019.9   

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  31. 日本コンクリート工学会研究委員会JCI-TC175FS「有害廃棄物及び放射性廃棄物の処分へのセメント・コンクリート技術の適用に関するFS委員会」   委員  

    2017.4 - 2018.3   

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    Committee type:Academic society

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  32. 日本コンクリート工学会文献調査委員会   委員  

    2016.4 - 2018.3   

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    Committee type:Academic society

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  33. セメント協会C-S-H研究委員会   委員  

    2015.10 - 2017.3   

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    Committee type:Academic society

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  34. 日本コンクリート工学会研究委員会JCI-TC152A「性能規定に基づくASR制御型設計・維持管理シナリオに関する研究委員会」   委員  

    2015.6 - 2017.3   

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  35. 日本コンクリート工学会東北支部専門研究委員会「塩害外力の評価方法と評価結果の分析・利活用研究委員会」   委員  

    2014.10 - 2016.9   

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  36. 日本建築学会材料施工委員会 鉄筋コンクリート工事運営委員会 収縮低減材料コンクリート施工指針作成小委員会 収縮低減材料指針資料作成WG   委員  

    2014.7 - 2016.3   

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  37. 日本建築学会東北支部研究委員会材料部会   委員  

    2014.4 - 2019.3   

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  38. 土木学会コンクリート委員会「セメント系構築物と周辺地盤の化学的相互作用研究小委員会(345委員会)」   委員  

    2011.9 - 2014.6   

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Awards 21

  1. 令和5年度土木学会全国大会 第78回年次学術講演会優秀講演賞

    2023.10   土木学会   モルタルの再吸水時にみられる膨潤挙動の顕微鏡観察手法に関する一考察

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    Award type:Award from Japanese society, conference, symposium, etc. 

  2. 令和5年度土木学会全国大会 第78回年次学術講演会優秀講演賞

    2023.10   土木学会   モルタルの再吸水時にみられる膨潤挙動の顕微鏡観察手法に関する一考察

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  3. Award 2023 for Outstanding Reviewer of Journal of Advanced Concrete Technology

    2023.9   Japan Concrete Institute  

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    Award type:Honored in official journal of a scientific society, scientific journal 

  4. Award 2023 for Outstanding Reviewer of Journal of Advanced Concrete Technology

    2023.9   Japan Concrete Institute  

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  5. Award 2022 for Best Reviewer of Journal of Advanced Concrete Technology

    2022.9   Japan Concrete Institute  

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  6. 土木学会吉田研究奨励賞

    2022.5   土木学会  

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  7. Materials and Structures Best Reviewer Award 2021

    2022.1   Springer Nature  

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  8. 九州橋梁・構造工学シンポジウム論文賞

    2020.12   九州橋梁・構造工学研究会  

    川上隆, 山田一夫, 佐川康貴

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  9. Award 2020 for Best Reviewer of Journal of Advanced Concrete Technology

    2020.9   Japan Concrete Institute  

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  10. Award 2019 for Best Reviewer of Journal of Advanced Concrete Technology

    2019.9   Japan Concrete Institute  

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  11. 2016年度日本建築学会大会学術講演会材料施工委員会若手優秀発表

    2016.11   日本建築学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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  12. 第42回コンクリート工学会コンクリート工学会賞(論文賞)

    2016.6   日本コンクリート工学会  

    丸山 一平, 五十嵐 豪

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

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  13. 平成27年度コンクリート工学会東北支部賞(奨励賞)

    2016.5   日本コンクリート工学会東北支部  

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

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  14. 2015年度日本建築学会大会学術講演会材料施工委員会若手優秀発表

    2015.11   日本建築学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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  15. 第12回前田記念工学振興財団山田一宇賞

    2015.6   前田記念工学振興財団  

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    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

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  16. 第41回コンクリート工学会コンクリート工学会賞(奨励賞)

    2015.6   日本コンクリート工学会  

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

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  17. 第28回日本建築学会東海賞(論文賞)

    2014.2   日本建築学会東海支部  

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

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  18. 第67回セメント技術大会優秀講演賞

    2013.7   セメント協会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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  19. 第33回コンクリート工学講演会年次論文奨励賞

    2011.7   日本コンクリート工学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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  20. 第32回コンクリート工学講演会年次論文奨励賞

    2010.7   日本コンクリート工学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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  21. 第20回日本建築学会優秀卒業論文賞

    2009.7   日本建築学会  

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Papers 119

  1. New insight on the thermal impact on cementitious materials due to high-temperature with water supply: Continuous expansive spalling in water Reviewed

    Taito Miura, Shintaro Miyamoto, Ippei Maruyama, Abudushalamu Aili, Takumi Sato, Yuji Nagae, Go Igarashi

    Case Studies in Construction Materials   Vol. 21   page: e03571 - e03571   2024.12

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.cscm.2024.e03571

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  2. Shrinkage reduction mechanism of low Ca/Si ratio C-A-S-H in cement pastes containing fly ash Reviewed

    Miki Segawa, Ryo Kurihara, Abudushalamu Aili, Go Igarashi, Ippei Maruyama

    Cement and Concrete Research   Vol. 186   page: 107683 - 107683   2024.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.cemconres.2024.107683

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  3. Effect of reinforcement on the anisotropic expansion of concrete with CSA-based expansive additives Reviewed International coauthorship

    Mayank Gupta, Kolneath Pen, Go Igarashi, Yuya Takahashi, Tetsuya Ishida

    Journal of Building Engineering   Vol. 97   page: 110740 - 110740   2024.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jobe.2024.110740

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  4. EVALUATION OF QUANTIFICATION TG METHODS FOR CARBONATES IN CARBONATED CEMENT PASTES Reviewed

      Vol. 46 ( 1 ) page: 637 - 642   2024.6

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  5. 合成C-A-S-HのCs吸着に伴う組成および構造の評価 Reviewed

    富田 さゆり, 五十嵐 豪, 山田 一夫, 丸山 一平

    コンクリート工学年次論文集   Vol. 46 ( 1 ) page: 757 - 762   2024.6

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  6. 炭酸化前及び炭酸化途中の自由水がセメント硬化体の炭酸化反応に与える影響 Reviewed

    伊神 竜生, アイリ アブドゥシャラム, 五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 46 ( 1 ) page: 607 - 612   2024.6

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  7. 海水と真水のモルタルへの浸透性状に関する一考察 Reviewed

    牛垣 雅也, 市川 大貴, 五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 46 ( 1 ) page: 619 - 624   2024.6

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  8. Effect of expansive additives and external restraint on the early age mechanical properties and microstructure of cement paste Reviewed International coauthorship

    Mayank Gupta, Go Igarashi, Yuya Takahashi, Jose Granja, Miguel Azenha, Tetsuya Ishida

    Construction and Building Materials   Vol. 422   2024.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.conbuildmat.2024.135655

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  9. 1H-NMR RELAXOMETRY ANALYSIS OF WATER CONTENT CHANGES IN HARDENED CEMENT PASTES DURING CARBONATION PROCESS Reviewed

    Ryusei IGAMI, Abudushalamu AILI, Go IGARASHI, Ippei MARUYAMA

    Cement Science and Concrete Technology   Vol. 77 ( 1 ) page: 44 - 52   2024.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Cement Association  

    DOI: https://doi.org/10.14250/cement.77.44

  10. TIME-DEPENDENT STRAIN DISTIBUTION OF MORTAR IN CONCRETE DURING WATER UPTAKE MONITORED BY DIGITAL IMAGE CORRELATION METHOD Reviewed

    Keigo OGAWA, Chihiro HASHIMOTO, Go IGARASHI, Ippei MARUYAMA

    Cement Science and Concrete Technology   Vol. 77 ( 1 ) page: 222 - 230   2024.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Cement Association  

    DOI: https://doi.org/10.14250/cement.77.222

  11. EVALUATION OF CHEMICAL COMPOSITION AND STRUCTURE OF DECOMPOSED C-A-S-H WITH CARBONATION Reviewed

    Sayuri TOMITA, Go IGARASHI, Kazuo YAMADA, Ippei MARUYAMA

    Cement Science and Concrete Technology   Vol. 77 ( 1 ) page: 62 - 70   2024.3

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    DOI: https://doi.org/10.14250/cement.77.62

  12. 1H-NMR RELAXOMETRY ANALYSIS OF WATER CONTENT CHANGES IN HARDENED CEMENT PASTES DURING CARBONATION PROCESS Reviewed

    Ryusei IGAMI, Abudushalamu AILI, Go IGARASHI, Ippei MARUYAMA

    Cement Science and Concrete Technology   Vol. 77 ( 1 ) page: 44 - 52   2024.3

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    <p>In this paper, <sup>1</sup>H-NMR Relaxometry is applied to carbonation phase and analyzes changes of chemically bound water content, mobile water content, and total water content in hardened cement paste with the progress of carbonation. The results showed that calcium hydroxide and C-S-H were carbonated at 20℃ and 85%RH. From the measurement of transverse relaxation time T<sub>2</sub> by CPMG method, it was confirmed that the transverse relaxation time of Interlayer and Gel pore increased with carbonation. There was a positive correlation between carbonation degree of calcium hydroxide calculated by thermogravimetric/differential thermal analysis and decreasing of chemically bound water measured by Solid echo method, confirming that chemically bound water in calcium hydroxide changed to mobile water due to carbonation. Regarding mobile water, the water content of Gel pore increased and that of Interlayer decreased in C-S-H during the initial stage of carbonation.</p>

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  13. TIME-DEPENDENT STRAIN DISTIBUTION OF MORTAR IN CONCRETE DURING WATER UPTAKE MONITORED BY DIGITAL IMAGE CORRELATION METHOD Reviewed

    Keigo OGAWA, Chihiro HASHIMOTO, Go IGARASHI, Ippei MARUYAMA

    Cement Science and Concrete Technology   Vol. 77 ( 1 ) page: 222 - 230   2024.3

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    <p>In order to visualize liquid water movement in concrete, changes in the state of concrete when water is immersed on one surface against concrete in a dry state were visualized using a digital image correlation method that can detect minute deformations on the surface of the object. By obtaining the change over time of the principal strain distribution from the amount of deformation, deformations showing drying shrinkage and swelling caused by liquid water penetration in the cement paste section were visualized. Deviations from the linear relationship between water absorption and depth of penetration and the square root of time, indicating liquid water penetration into cementitious materials, were confirmed, indirectly indicating that water movement causes water absorption and swelling of the cement paste, even in concrete aggregate scale analysis.</p>

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  14. EVALUATION OF CHEMICAL COMPOSITION AND STRUCTURE OF DECOMPOSED C-A-S-H WITH CARBONATION Reviewed

    Sayuri TOMITA, Go IGARASHI, Kazuo YAMADA, Ippei MARUYAMA

    Cement Science and Concrete Technology   Vol. 77 ( 1 ) page: 62 - 70   2024.3

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    <p>In this study, we focused on the structural changes and phase composition of Calcium aluminate silicate hydrate (C-A-S-H) before and after carbonation to confirm its transformation by carbonation in the medium humidity range and its subsequent change after contact with liquid water. Based on the results of NMR, SEM-EDS analysis, and liquid phase composition analysis of the synthesized C-A-S-H, the structure was identified from the Ca/Si, Al/Si, H/Si, and Na/Si ratios and a schematic model was presented. After carbonation, the formation of vaterite, calcite, and aluminosilicate gel were confirmed. Unlike synthetic vaterite, vaterite of carbonated sample did not undergo a phase transition at 450℃. Thermogravimetric analysis demonstrated that carbonated sample’s vaterite undergoes a phase transition at 450-600℃. The vaterite underwent a phase change after immersion in the liquid phase and was confirmed to be all calcite. The aluminosilicate gel was found to have compositions of Al/Si=0.16, Ca/Si=0.09, and Na/Si=0.09.</p>

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  15. Evaluation of seismic performance of aged massive RC wall structure restrained by adjacent members using RBSM Reviewed

    Puttipong Srimook, Kazuo Yamada, Sayuri Tomita, Go Igarashi, Haruka Aihara, Yasumasa Tojo, Ippei Maruyama

    Nuclear Engineering and Design   Vol. 414   page: 112602 - 112602   2023.12

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  16. Multiscale expansion modeling of concrete with free lime-based expansive additives under isotropic conditions using poromechanics Reviewed International coauthorship International journal

    Journal of Building Engineering   Vol. 77   2023.10

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    Expansive additives have been used in concrete to compensate for shrinkage and to induce chemical pre-stress. The cement paste incurs internal expansive stress owing to the formation of confined portlandite and ettringite crystals in the pore network, resulting in expansion at the macroscale. In this study, a poromechanical model was designed to model the expansion of cement paste and concrete due to the formation of such expansive hydrates. The effective expansive stress on the cement paste was calculated considering the volume of the hydrates derived from the hydration model and tangent poroelastic properties estimated using a micromechanical scheme. Experiments were performed to measure the expansion of the cement paste and concrete with different amounts of expansive additives under stress-free and restraint conditions. The model predictions were compared with the experimentally measured expansion, which confirmed the rationality of the model for estimating free expansion. Finally, the extension of the current modeling framework to estimate the restrained expansion of concrete is deliberated. The proposed multiscale model can be employed by the engineers to estimate the expansion of cement paste and concrete with EA and provide insights to estimate the amount of EA required for a given application.

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  17. Various fundamental factors affecting the ion penetration in concrete Reviewed International journal

    K. Yamada, I. Maruyama, T. Ichikawa, H. Hokora, S. Tomita, Y. Tojo, K. Shibuya, K. Haga, Y. Hosokawa, G. Igarashi

    Proceedings of the 16th International Congress on the Chemistry of Cement 2023 (ICCC2023)   ( 3 ) page: 202 - 206   2023.9

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  18. Various fundamental factors affecting the ion penetration in concrete Reviewed International journal

    K. Yamada, I. Maruyama, T. Ichikawa, H. Hokora, S. Tomita, Y. Tojo, K. Shibuya, K. Haga, Y. Hosokawa, G. Igarashi

    Proceedings of the 16th International Congress on the Chemistry of Cement 2023 (ICCC2023)   ( 3 ) page: 202 - 206   2023.9

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  19. A Review of Numerical Models for the Performance Assessment of Concrete Structures Affected by Alkali-Silica Reaction Reviewed International coauthorship International journal

    Takahashi Yuya, Miura Taito, Ueda Naoshi, Toda Yoshihiko, Igarashi Go, Multon Stéphane, Kawabata Yuichiro

    Journal of Advanced Concrete Technology   Vol. 21 ( 8 ) page: 655 - 679   2023.8

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    <p>This paper reviews numerical studies on the effect of expansion and damage due to alkali-silica reaction (ASR) on the mechanical performance of concrete and reinforced concrete at the structural scale level. Previous research on model development that has focused on the performance of RC members or structures is collected and summarized based on how they operationalize expansion progress. The models can be divided into three categories: models that receive the target expansion amount as an input value, models that use expansion curves, and models that calculate the increase in free expansion by considering the kinetic process of ASR. The aim of the model development can be related to either the deformation of the member or the load capacity for static or dynamic load actions. Expansion transfer under confined conditions is characteristic of the ASR problem, and the methods to model expansion transfer are accordingly summarized. Various considerations concerning the effect of ASR expansion and associated damage on the concrete constitutive laws are also studied. Expansion transfer under multi-axial stress states can be accurately reproduced by the modeling of expansion redistribution and volumetric expansion reduction under stress conditions. There are diverse methods to model the resultant deterioration of mechanical properties, but the primary method is by reducing the strength and elastic modulus according to empirically determined relationships. The ideal modeling approach is still under discussion because the effect of the anisotropic cracking state on the anisotropic mechanical response still requires further study. Finally, current problems of assessment of ASR-damaged concrete structures were discussed, and the significance of the causal correlation between macroscopic expansion behavior and microscale factors was suggested.</p>

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  20. Multiscale chemo-mechanical modeling of concrete expansion with free lime-based expansive additives under restraint conditions Reviewed International coauthorship International journal

    Mayank Gupta, Go Igarashi, Yuya Takahashi, Tetsuya Ishida

    Cement and Concrete Composites   Vol. 141   page: 105126 - 105126   2023.8

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    Expansion of concrete due to expansive additives (EAs) is greatly affected by the degree of external restraints in the form of reinforcements and supports. Furthermore, the presence of anisotropic restraints influences concrete expansion in different directions. In this study, a chemo-mechanical model was developed to estimate concrete expansion under the framework of poromechanics. The volume of expansive hydrates was obtained from the hydration model, which was used for estimating the stress on the cement paste using poromechanical formulations. An external non-isotropic state of stress affects the orientation of crystal precipitating inside the pores of the cement paste. Thus, anisotropy in concrete expansion due to external stress was considered by maintaining the chemo-mechanical equilibrium of crystals of expansive hydrates, which was reflected in the poro-elastic constants utilized to estimate the stress at the cement paste scale. Poroelastic coefficients were estimated using a micromechanical scheme reflecting the effect of crystal orientation. Dedicated experiments were performed to comprehend the anisotropic expansion of concrete under anisotropic external restraint conditions. Finally, the applicability of the model was verified by comparing the expansion in different directions estimated from the model and experiments performed in this study with available literature data. Thus, the developed chemo-mechanical model could benefit practitioners and engineers in evaluating the expansion behavior of restrained concrete for a given application.

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  21. X線CR画像と画像相関法を用いたコンクリートの水分移動の影響評価 Reviewed

    Kim Suji, Aili Abudushalamu, 五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 45 ( 1 ) page: 460 - 465   2023.7

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  22. 低温条件およびcalciteの有無によるセメントペーストの海水浸漬時の固液相組成変化に関する基礎的検討 Reviewed

    木下 弘晶, 宮本 慎太郎, 渡辺 智也, 五十嵐 豪

    コンクリート工学年次論文集   Vol. 45 ( 1 ) page: 622 - 627   2023.7

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  23. フライアッシュを混和したセメント硬化体の乾燥収縮性状 Reviewed

    瀬川 実暉, 五十嵐 豪, Aili Abudushalamu, 丸山 一平

    コンクリート工学年次論文集   Vol. 45 ( 1 ) page: 232 - 237   2023.7

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  24. セメント硬化体の炭酸化とそれに伴う微細構造変化に及ぼすCO2濃度及び初期含水率の影響 Reviewed

    伊神 竜生, Aili abudushalamu, 五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 45 ( 1 ) page: 268 - 273   2023.7

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  25. X線CR画像と画像相関法を用いたコンクリートの水分移動の影響評価 Reviewed

    Kim Suji, Aili Abudushalamu, 五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 45 ( 1 ) page: 460 - 465   2023.7

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  26. 低温条件およびcalciteの有無によるセメントペーストの海水浸漬時の固液相組成変化に関する基礎的検討 Reviewed

    木下 弘晶, 宮本 慎太郎, 渡辺 智也, 五十嵐 豪

    コンクリート工学年次論文集   Vol. 45 ( 1 ) page: 622 - 627   2023.7

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  27. フライアッシュを混和したセメント硬化体の乾燥収縮性状 Reviewed

    瀬川 実暉, 五十嵐 豪, Aili Abudushalamu, 丸山 一平

    コンクリート工学年次論文集   Vol. 45 ( 1 ) page: 232 - 237   2023.7

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  28. セメント硬化体の炭酸化とそれに伴う微細構造変化に及ぼすCO2濃度及び初期含水率の影響 Reviewed

    伊神 竜生, Aili abudushalamu, 五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 45 ( 1 ) page: 268 - 273   2023.7

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  29. Pilot study on the influence of high alkali content coal gasification slag fine aggregate on alkali silica reaction Reviewed

    Go IGARASHI, Yuichiro KAWABATA, Tadataka MATSUURA, Tetsuya ISHIDA

    Cement Science and Concrete Technology   Vol. 76 ( 1 ) page: 238 - 244   2023.3

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  30. Penetration of Cs and Sr into Cracked Dry Carbonated Mortar Considering the Contamination History of Fukushima Daiichi NPP Reviewed International journal

    Yamada, K., Tojo, Y., Aihara, H., Tomita, S., Hokora, H., Shibuya, K., Koma, K., Igarashi, G., Hosokawa, Y., Maruyama, I.

    Proceedings of WM2023 Conference     page: 23068   2023.2

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  31. Penetration of Cs and Sr into Cracked Dry Carbonated Mortar Considering the Contamination History of Fukushima Daiichi NPP Reviewed International journal

    Yamada, K, Tojo, Y, Aihara, H, Tomita, S, Hokora, H, Shibuya, K, Koma, K, Igarashi, G, Hosokawa, Y, Maruyama, I

    Proceedings of WM2023 Conference     page: 23068   2023.2

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  32. Expansion characteristics of concrete with free lime based expansive additives under uniaxial restraint conditions Reviewed International coauthorship International journal

    Mayank Gupta, Kolneath Pen, Go Igarashi, Yuya Takahashi, Tetsuya Ishida

    Construction and Building Materials   Vol. 356   2022.11

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    Expansive additives in higher dosages induce chemical prestress in concrete by imparting higher early-age expansion. However, induced stress and concrete expansion can vary significantly, depending on different restraint conditions. In addition, concrete expansion can be highly anisotropic depending on the nature of external restraints and boundary conditions. Experimentations have been performed to study the effect of uniaxial (anisotropic) restraint on the concrete expansion (in both restraint and stress-free directions) and induced prestress. A higher degree of restraint resulted in a substantial decrement in the longitudinal expansion. In contrast, expansion in the stress-free (lateral) direction was not much affected by the restraint in other direction. As a result, an overall decrement in the volumetric expansion was observed with an increase in the reinforcement ratios. Stress induced in concrete due to the restraint expansion in the longitudinal direction was found to be higher for a higher reinforcement ratio. Data provided from the current work can be used for the comprehensive modelling of expansive concrete under external restraints.

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  33. Evaluation of thermal crack width and crack spacing in massive reinforced concrete structures subject to external restraints using RBSM Reviewed International journal

    Puttipong Srimook, Ippei Maruyama, Kazutoshi Shibuya, Sayuri Tomita, Go Igarashi, Yo Hibino, Kazuo Yamada

    Engineering fracture mechanics   Vol. 274   2022.10

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    This study aimed to develop a numerical method to evaluate thermal cracking, in terms of pa-rameters such as thermal crack width and crack spacing, on massive reinforced concrete (RC) wall structures externally restrained by a base structure. The existing experimental study was inves-tigated using the rigid body-spring model (RBSM) with new constitutive laws developed for this objective. Thermal cracks, which localized and propagated throughout the wall thickness, were successfully reproduced, and the good agreement with the experiment indicated the capability of the proposed numerical method. The time-dependent cracking behavior and the impacts of fac-tors affecting thermal cracking, which are difficult to investigate experimentally, are discussed.

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  34. Surface area changes in C3S paste during the first drying analyzed by 1H NMR relaxometry Reviewed International journal

    Ippei Maruyama, Tetsuya Fujimaki, Ryo Kurihara, Go Igarashi, Takahiro Ohkubo

    Cement and concrete research   Vol. 156   2022.6

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    The drying process of pure C3S paste with a water to binder ratio of 0.55 under different relative humidity conditions was monitored using proton nuclear magnetic resonance relaxometry. The desorption isotherm of the interlayer water was obtained experimentally. The relationship between the interlayer water content and T-2 value of the interlayer water defines the surface relaxation time, which provides quantitative data regarding the adsorbed water. According to the fast exchange model, the surface area at the sealed condition was 630 m(2)/g-calcium silicate hydrate (C-S-H), and it decreased during drying, which was associated with an increase in chemically bound water. The ratio of the decrease in the interlayer surface area to the increase in chemically bound water was 5400 m(2)/g. Based on this value, the total surface area of C-S-H was calculated to 830 to 921 m(2)/g-C-S-H.

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  35. Numerical Simulation of Dimensional Stability of Precast Segments Exposed to Solar Radiation during Yard Storage Reviewed International journal

    Go Igarashi, Mamoru Ichimiya, Fumito Ohya, Tetsuya Ishida

    Journal of Advanced Concrete Technology   Vol. 20 ( 3 ) page: 200 - 211   2022.3

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    There has been a recent trend in Japan toward using precast segments to reduce the burden on construction sites and improve productivity. In large-scale precast segment structures such as bridges, the deformation of precast segments must be controlled during yard storage. This paper uses the multi-scale integrated chemo-hygric computational system (DuCOM-COM3) developed and extended by our group to numerically evaluate dimensional stability during yard storage of precast concrete with fly ash for a large-scale precast segmental bridge. To demonstrate the sensitivity to deformation behavior, simulations are conducted under three hypothetical cases of outdoor air temperature, outdoor air humidity, and temperature at the top surface of the segment, including the harsh temperature conditions expected in the Shikoku region. In the sensitivity analysis using the climatic conditions obtained from the field monitoring data as input, the reproducibility of the surface temperature and shrinkage of the concrete segment is improved by introducing the absorption of shortwave radiation by solar radiation on the segment top surface as an input parameter in the simulation.

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  36. Modeling of the Adsorption Behavior of Cs and Sr on Calcium Silicate Hydrates Reviewed International journal

    Sayuri Tomita, Kazuko Haga, Yoshifumi Hosokawa, Kazuo Yamada, Go Igarashi, Ippei Maruyama

    Journal of Advanced Concrete Technology   Vol. 19 ( 10 ) page: 1061 - 1074   2021.10

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    For safe disposal of the large volume of concrete waste generated during the decommissioning of the Fukushima Daiichi Nuclear Power Station (F1NPS), the state of Cs and Sr contamination in concrete waste must ideally be estimated in advance during waste disposal planning Cs and Sr are primarily adsorbed by calcium silicate hydrate (C-S-H) in cementitious materials. However, the amount of adsorption varies greatly with the Ca/Si mole ratio (C/S ratio) of C-S-H and with the presence or absence of coexisting elements, both of which vary according to interactions with the environment. This study attempted to model on the results of experiments on Cs and Sr adsorption by synthetic C-S-H with varying C/S ratios. Furthermore, for verifying whether the model can be applied to F1NPS, the results calculated by the model were compared with the experimental results for Cs and Sr adsorption on cement paste subjected to environmental conditions (carbonation, leaching, and presence or absence of coexisting elements (Na, K)). It was confirmed that the present model is overall able to reproduce Cs and Sr adsorption behavior on cement paste, considering changes due to environmental conditions.

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  37. General Overview of the Research Project Investigating the Radionuclide Solution Behavior in Mock Mortar Matrix Modeled after Conditions at the Fukushima-Daiichi Nuclear Power Station Reviewed International journal

    Go Igarashi, Kazuko Haga, Kazuo Yamada, Haruka Aihara, Atsuhiro Shibata, Yoshikazu Koma, Ippei Maruyama

    JOURNAL OF ADVANCED CONCRETE TECHNOLOGY   Vol. 19 ( 9 ) page: 950 - 976   2021.9

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    Decommissioning of the Fukushima Daiichi Nuclear Power Station (F1NPS) in a proper manner requires assessment of the contamination levels and mechanisms for contamination in the concrete structures. Between January 2018 and March 2020, Japan's Ministry of Education Ministry of Education, Culture, Sports, Science and Technology (MEXT) conducted a project called "The Analysis of Radionuclide Contamination Mechanisms of Concrete and the Estimation of Contamination Distribution at the Fukushima Daiichi Nuclear Power Station". In this review, we outline the results of this study. The experimental results from the first project indicate that concrete carbonation, Ca leaching, and drying conditions affected the adsorption behaviors of Cs and Sr and therefore, their penetration depths. Additionally, the studies showed that a-nuclides precipitated on the surface of the samples because concrete causes a high pH. A reaction transport model was developed to assess further the adsorption characteristics of Cs and Sr in carbonated cement paste and on concrete aggregates. The model used real concrete characteristics from the materials used at F1NPS and historical boundary conditions at the site, including radionuclide concentrations and penetration profiles within the turbine pit wall. Capillary water suction resulting from dried concrete was evaluated by considering structural changes in cement hydrates using X-ray CR and H-1-NMR relaxometry.

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  38. Hinderance of C-S-H sheet piling during first drying using a shrinkage reducing agent: A SAXS study Reviewed International journal

    Ippei Maruyama, Go Igarashi, Kunio Matsui, Naoki Sakamoto

    CEMENT AND CONCRETE RESEARCH   Vol. 144   2021.6

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    The role of a shrinkage reducing agent (SRA) in the hardened cement paste during a first desorption process was investigated by measuring the small-angle X-ray scattering (SAXS). Fractal disc analysis and Guinier approximation were adopted to interpret the SAXS profiles. We experimentally confirmed that the presence of SRA molecules mitigated the piling of calcium-silicate hydrate (C-S-H) sheets, which could be monitored by the increase in the thickness of the disc, representing the agglomeration of C-S-H sheets. In addition, the basal spacing of C-S-H did not change during the drying. By contrast, the diameter of the discs monotonically decreased and showed a similar trend to that of samples lacking SRA. Based on these findings, we concluded that SRA molecules were on the surface of the C-S-H sheets and mitigated the piling, facilitating water removal from the C-S-H agglomeration in the RH range of 80-40%.

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  39. Experimental Study Investigating the Effects of Concrete Conditions on the Penetration Behaviors of Cs and Sr at Low Concentration Ranges International journal

    Kazuo Yamada, Go Igarashi, Norihisa Osawa, Rohith Kiran, Kazuko Haga, Sayuri Tomita, Ippei Maruyama

    Journal of advanced concrete technology   Vol. 19 ( 6 ) page: 756 - 770   2021.6

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    To decommission of the Fukushima-Daiichi nuclear power plant after the reactor accident, it is important to estimate the distribution of radionuclide contamination in the concrete for key elements such as Cs and Sr. A reaction transport model will be developed for these calculations. However, for a realistic model, the behaviors of Cs and Sr penetration in concrete must be experimentally investigated. A part of the results of a MEXT project called "The Analysis of Radionuclide Contamination Mechanisms of Concrete and the Estimation of Contamination Distribution at the Fukushima Daiichi Nuclear Power Station" are presented in this technical report. From our penetration analyses, the behaviors of neither Cs nor Sr were affected by each other. Additionally, the apparent diffusion coefficients of Cs and Sr were not significantly affected by the concentration or the presence of clay in the mortars. The penetration depth of Sr was smaller than that of Cs, and fly ash blended cement increased the resistance to penetration compared with ordinary Portland cement. Carbonation in the mortar samples increased the adsorption of Cs especially. Sr interacted with cement hydrates more than with clays. In oven-dried mortars, under the condition of water suction, the presence of clay retarded Cs penetration but had no effect on Sr. When the mortars were carbonated and oven-dried, the interactions between the solid phase and Cs or Sr took hours at least to complete.

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  40. Research on a new approach assessing ASR of concrete structures for nuclear facilities Reviewed International journal

    J. Eto, S. Ogawa, K. Shibuya, Y. Kawabata, G. Igarashi, A. Teramoto, I. Maruyama, K. Yamada

    Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations     page: 2651 - 2658   2021.4

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    Japan Nuclear Energy Safety Organization (JNES) has published an aggregate test method so-called as JNES flow (the method mainly composed of international methods RILEM AAR 3 and RILEM AAR 4) and alkali-silica reaction (ASR) diagnosis method. In this research, we conducted the RILEM methods using Japanese aggregates, which were international aggregate test methods that were considered to be highly reliable. Especially, we evaluated the suitability of various RILEM aggregate testing methods for Japanese aggregates with regard to methods for detecting reactivity of late expansive aggregates, which have been reported in recent years. Furthermore, for the ASR diagnostic method that emphasizes the petrological evaluation test after collecting concrete cores samples, various test specimens with different stages of deterioration were produced, and the core appearance observation and polarization microscope observation were performed on the collected core samples. We also conducted observations using a film scanner and evaluated the applicability of the proposed ASR diagnostic method to Japanese aggregates. Based on the above, an example of the alkali aggregate reaction test flow of concrete structures effective for reactive aggregates were proposed through comparison among various domestic and international aggregate test methods. Furthermore, an example of the alkali aggregate reaction diagnosis flow of concrete structures was proposed by conducting tests with several methods using cores which were sampled from the concrete specimens and the concrete structures.

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  41. Water Uptake in OPC and FAC Mortars under Different Temperature Conditions Reviewed International journal

    Rohith Kiran, Hamza Samouh, Akira Matsuda, Go Igarashi, Sayuri Tomita, Kazuo Yamada, Ippei Maruyama

    JOURNAL OF ADVANCED CONCRETE TECHNOLOGY   Vol. 19 ( 3 ) page: 168 - 180   2021.3

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    This experimental and numerical study aims to evaluate the penetration depth of contaminated water in the concrete structures involved in the Fukushima Daiichi nuclear powerplant. The influence of the mortar mixture on water absorption was investigated by varying the composition: mortars containing aggregates from river sand and crushed limestone sand were compared, and 15% of the cement in the mixture was substituted with fly ash. The effect of temperature in nuclear conditions is also significant; therefore, water uptake at temperatures of 20 and 60 degrees C was considered. Finally, pre-drying conditions were studied by drying the sample at two different conditions: at 105 degrees C and at 40% RH (relative humidity) and 20 degrees C. Water uptake was monitored using x-ray computed radiography in combination with mass measurements. In all cases, anomalous sorption, or a nonlinear relationship between penetration depth and the square root of exposure time was observed, with the sorption curves showing bimodal behavior. The aggregate type had no significant effect on the water uptake results. However, the samples containing fly ash clearly had lower water uptake rates, which can be explained by the differences in the calcium silicate hydrate (C-S-H) structures. With increasing temperature, the penetration was slightly accelerated at the beginning of the experiment, with the rate of penetration then decreasing rapidly. The densification of C-S-H at higher temperatures could contribute to this phenomenon. Microstructural rearrangements can also explain why the highest uptake rates occurred for samples that were exposed to severe drying conditions (105 degrees C). The experimental results were consistent when the microstructural rearrangement was considered, further confirming these conclusions.

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  42. A Project Focusing on the Contamination Mechanism of Concrete After the Accident at Fukushima Daiichi Nuclear Power Plant Reviewed International journal

    Yamada, K., Maruyama, I., Haga, K., Igarashi, G., Aihara, H., Tomita, S., Kiran, R., Osawa, N., Shibata, A., Shibuya, K., Ida, M., Kobayashi, Y., Koma, Y.

    Proceedings of WM2021 Conference     page: 21320   2021.2

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  43. A Project Focusing on the Contamination Mechanism of Concrete After the Accident at Fukushima Daiichi Nuclear Power Plant Reviewed International journal

    Yamada, K, Maruyama, I, Haga, K, Igarashi, G, Aihara, H, Tomita, S, Kiran, R, Osawa, N, Shibata, A, Shibuya, K, Ida, M, Kobayashi, Y, Koma, Y

    Proceedings of WM2021 Conference     page: 21320   2021.2

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  44. Development of Expansive Agent Model in a Multi-scale Thermodynamic Framework Based on Hydration and Microstructure Formation Reviewed International journal

    Kolneath Pen, Tetsuya Ishida, Igarashi Go, Yuya Takahashi, Shinya Ito

    RILEM Bookseries   Vol. 31   page: 211 - 225   2021

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    This study aims to develop an analytical tool to predict the expansion of Hauyne and free-lime based expansive additives in RC structures. Hydration of species was based on the multi-component heat of hydration model which incorporates referential heat rate at a certain temperature and thermal activities following Arrhenius' law of chemical reaction. All other time-dependent properties of concrete such as elastic modulus, temperature, pore pressure, creep, moisture status, total porosity of interlayer, gel and capillary pores are computed internally based on the micromodels of materials inside the system. Coupling this material information with poromechanics, volumetric change generated by cement hydration and shrinkage is systematically included in the modelling of concrete mechanics, which deals with macroscopic structural responses based on the space-averaged constitutive laws on the fixed four-way cracked concrete model. Finally, the models are then verified with experimental results that could prove the models’ capability in predicting the amount of expansion under various replacement ratios.

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  45. Temperature-Dependent Water Redistribution from Large Pores to Fine Pores after Water Uptake in Hardened Cement Paste Reviewed International journal

    Rohith Kiran, Hamza Samouh, Go Igarashi, Tatsuto Haji, Takahiro Ohkubo, Sayuri Tomita, Ippei Maruyama

    Journal of Advanced Concrete Technology   Vol. 18 ( 10 ) page: 588 - 599   2020.10

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    During sorption, the microstructural evolutions of two different cement pastes (with water-to-cement ratios of 0.40 and 0.55) are studied via proton-nuclear-magnetic-resonance relaxometry. The water uptake test is performed for samples dried at 105 degrees C under three different temperatures of 20 degrees C, 40 degrees C, and 60 degrees C for the first twenty-six days of sorption. It is observed that the water went first to the larger pores before migrating to the finest ones. This behavior is accelerated with increasing temperature. The rate of water exchange between fine and large pores is estimated and found to increase with temperature for both studied mixtures. The activation energy corresponding to this water movement is calculated and found to be higher for the lowest water-to-cement ratio, owing its finer microstructure. Finally, the activation energy related to the local water transport in re-distribution from large pores to fine pores is calculated and found to be inferior to the experimental results, which can be explained by the dynamic microstructure not being considered in the classical theories.

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  46. 拡張BET理論から得られる異なる温度における第一脱着性状 Reviewed

    五十嵐豪, 丸山一平, 石田哲也

    コンクリート工学年次論文集   Vol. 42 ( 1 ) page: 407 - 412   2020.7

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  47. Experimental study on the transfer of Cs, Sr, Pu and water in concrete for the estimation of contamination Reviewed International journal

    Yamada, K., Maruyama, I., Ida, M., Aihara, H., Kiran, R., Tomita, S., Igarashi, G., Haga, K., Shibuya, K., Shibata, A., Koma, Y.

    Proceedings of WM2020 Conference     page: 20085   2020.2

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  48. Experimental study on the transfer of Cs, Sr, Pu and water in concrete for the estimation of contamination Reviewed International journal

    Yamada, K, Maruyama, I, Ida, M, Aihara, H, Kiran, R, Tomita, S, Igarashi, G, Haga, K, Shibuya, K, Shibata, A, Koma, Y

    Proceedings of WM2020 Conference     page: 20085   2020.2

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  49. Tailoring Confining Jacket for Concrete Column Using Ultra High Performance-Fiber Reinforced Cementitious Composites (UHP-FRCC) with High Volume Fly Ash (HVFA) Reviewed International coauthorship International journal

    Alessandro P. Fantilli, Lucia Paternesi Meloni, Tomoya Nishiwaki, Go Igarashi

    MATERIALS   Vol. 12 ( 23 )   2019.12

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    Ultra-High Performance Fibre-Reinforced Cementitious Composites (UHP-FRCC) show excellent mechanical performances in terms of strength, ductility, and durability. Therefore, these cementitious materials have been successfully used for repairing, strengthening, and seismic retrofitting of old structures. However, UHP-FRCCs are not always environmental friendly products, especially in terms of the initial cost, due to the large quantity of cement that is contained in the mixture. Different rates of fly ash substitute herein part of the cement, and the new UHP-FRCCs are used to retrofit concrete columns to overcome this problem. To simulate the mechanical response of these columns, cylindrical specimens, which are made of normal concrete and reinforced with different UHP-FRCC jackets, are tested in uniaxial compression. Relationships between the size of the jacket, the percentage of cement replaced by fly ash, and the strength of the columns are measured and analyzed by means of the eco-mechanical approach. As a result, a replacement of approximately 50% of cement with fly ash, and a suitable thickness of the UHP-FRCC jacket, might ensure the lowest environmental impact without compromising the mechanical performances.

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  50. Field Survey of Radioactive Cesium Contamination in Concrete After the Fukushima-Daiichi Nuclear Power Station Accident Reviewed International journal

    Kazuo Yamada, Yukio Takeuchi, Go Igarashi, Masahiko Osako

    Journal of Advanced Concrete Technology   Vol. 17 ( 12 ) page: 659 - 672   2019.12

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    The Fukushima-Daiichi nuclear power station accident in East Japan in 2011 released radioactive cesium (r-Cs) into the surrounding environment. In addition to the major contamination of soil and vegetation, surrounding concrete structures have also been contaminated. Understanding the contamination characteristics is important for the decontamination or disposal of offsite and onsite concrete structures. However, r-Cs contamination of actual concrete has not been extensively investigated. In this paper, the r-Cs contamination characteristics of actual concrete are introduced on the basis of several field surveys and analysis of concrete samples taken from actual contaminated structures in the Fukushima prefecture. As no dissolution to water was detected, the surface contamination was safely removed by water-jet abrasion. However, in KCl solution, significant dissolution of r-Cs was detected. A contamination depth analysis was performed by quantitative r-Cs concentration mapping based on beta-ray radiography using imaging plates. In many cases, such as roadside gutter cover plates, r-Cs was located on the surface without significant penetration into the concrete. However, in cases such as degraded concrete, deeper penetration up to several millimeters deep was observed. In cracked concrete, the r-Cs penetrated at least 10 cm, with the contamination level decreasing one order of magnitude in the first 1 cm.

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  51. コンクリート断面に現れるASR ゲルの観察における二重着色法(ゲルステイン法)とゲルフルオレッセンス法との比較

    五十嵐豪, 山田一夫, 村上光樹, 佐川康貴

    コンクリート工学年次論文集   Vol. 41 ( 1 )   2019.9

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  52. イメージングプレートを用いた Cs-137 と Sr-90 の判別定量に関する検討 Reviewed

    大澤紀久, 山田一夫, 五十嵐豪, 富田さゆり

    コンクリート工学年次論文集   Vol. 41 ( 1 ) page: 35 - 40   2019.7

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  53. イメージングプレートを用いたCs-137とSr-90の判別定量に関する検討 Reviewed

    大澤 紀久, 山田 一夫, 五十嵐 豪, 富田 さゆり

    コンクリート工学年次論文集   Vol. 41 ( 1 ) page: 35 - 40   2019.7

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  54. コンクリート断面に現れるASRゲルの観察における二重着色法(ゲルステイン法)とゲルフルオレッセンス法との比較 Reviewed

    五十嵐 豪, 山田 一夫, 村上 光樹, 佐川 康貴

    コンクリート工学年次論文集   Vol. 41 ( 1 ) page: 899 - 904   2019.7

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  55. 異なる径のPP短繊維を多添加した繊維補強コンクリートの材料特性及びひび割れに対する自己修復機能に関する研究 Reviewed

    李 豪傑, 李 豪傑, 西脇 智哉, 佐藤 駿介, 五十嵐 豪

    コンクリート工学年次論文集   Vol. 41 ( 1 ) page: 305 - 310   2019.6

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  56. 超高強度高靭性繊維補強セメント系複合材料の合理的な適用方法の検討とその環境影響評価 Reviewed

    安達 由佳, 西脇 智哉, 五十嵐 豪

    コンクリート工学年次論文集   Vol. 41 ( 1 ) page: 317 - 322   2019.6

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  57. 酸化亜鉛を添加した高炉スラグ微粉末ベースジオポリマーの性能発現挙動に関する基礎的検討 Reviewed

    古江 翔子, 五十嵐 豪, 西脇 智哉

    コンクリート工学年次論文集   Vol. 41 ( 1 ) page: 1931 - 1936   2019.6

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  58. New Project on the Analysis of Contamination Mechanisms of Concrete at the Fukushima Daiichi Nuclear Power Station Reviewed International journal

    Yamada, K., Maruyama, I., Koma, Y., Aihara, H., Haga, K., Shibuya, K., Igarashi, G.

    Proceedings of WM2019 Conference     2019.2

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  59. New Project on the Analysis of Contamination Mechanisms of Concrete at the Fukushima Daiichi Nuclear Power Station Reviewed International journal

    Yamada, K, Maruyama, I, Koma, Y, Aihara, H, Haga, K, Shibuya, K, Igarashi, G

    Proceedings of WM2019 Conference     2019.2

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  60. イメージングプレートを用いたCs-137とSr-90の判別定量の基礎実験 Reviewed

    大澤紀久, 山田一夫, 竹内幸生, 五十嵐豪

    コンクリート工学年次論文集   Vol. 40 ( 1 ) page: 63 - 68   2018.7

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  61. ひび割れを有するUHP-FRCCの曲げクリープ時のひび割れ変化 Reviewed

    高桑 謙吾, 西脇 智哉, Kwon Sukmin, 五十嵐 豪

    コンクリート工学年次論文集 = Proceedings of the Japan Concrete Institute   Vol. 40 ( 1 ) page: 285 - 290   2018.6

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  62. ひび割れを有するUHP-FRCCの凍結融解抵抗性能および自己治癒 Reviewed

    大坂 祐樹, 西脇 智哉, 石山 智, 五十嵐 豪

    コンクリート工学年次論文集 = Proceedings of the Japan Concrete Institute   Vol. 40 ( 1 ) page: 280 - 284   2018.6

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  63. Effects of Soak Solution Type on Alkali Release from Volcanic Aggregates - Is Alkali Release Really Responsible for Accelerating ASR Expansion? - Reviewed International journal

    Yuichiro Kawabata, Kazuo Yamada, Go Igarashi, Yasutaka Sagawa

    Journal of Advanced Concrete Technology   Vol. 16 ( 1 ) page: 61 - 74   2018.1

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    Alkali release from aggregates is considered to cause expansion due to the alkali-silica reaction (ASR), owing to the increase in the hydroxide ion concentration (namely pH) of the pore solution. However, a direct validation of this assertion has not yet been made. In this research, the effects of the type of soak solution, which might better mimic the composition of the pore solution, on the behavior of alkali release from aggregates are investigated through immersion tests of aggregates. More importantly, accompanying ions dissolved from the aggregates are also measured in order to determine the mechanism for the increase in hydroxide ion concentration of the pore solution. The test results show that this increase can barely be observed, despite a considerable amount of alkalis being released. The results critically question the conventional view that alkali released from an aggregate serves to accelerate the ASR.

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  64. Ecological and Mechanical Properties of Ultra High Performance - Fiber Reinforced Cementitious Composites Containing High Volume Fly Ash Reviewed International coauthorship International journal

    Tomoya Nishiwaki, Keita Suzuki, Sukmin Kwon, Go Igarashi, Alessandro P. Fantilli

    STRAIN-HARDENING CEMENT-BASED COMPOSITES   Vol. 15   page: 249 - 256   2018

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    Ultra High Performance - Fiber Reinforced Cementitious Composites (UHP-FRCC) has successfully developed in the last decades. They show excellent mechanical properties and durability, due to the highly dense microstructure produced by extremely low water/binder ratio and large amounts of cement. Thus, replacing part of the cement content with High Volume Fly Ash (HVFA) could be an effective way to improve also the ecological properties of UHP-FRCC. Indeed, most of the carbon footprint of cement-based composites is caused by the CO2 production of cement manufacturing. On the other hand, HVFA tends to reduce the mechanical properties of UHP-FRCC, especially at the early age. To evaluate the effect of some cement replacement (20, 50 and 70% by weight), a series of uniaxial compression and tensile tests have been performed and described in this paper. At the same time, through the Eco-Mechanical Index (EMI), ecological performances are evaluated on the basis of the measured mechanical properties. As a result, the application of UHP-FRCC in full-scale structures (e.g., composite concrete columns) is really convenient in the presence of HVFA, although the material properties (the compressive strength, in particular) show an opposite trend.

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  65. アルカリラッピングしたコンクリートプリズムを用いたASR加速試験の適用性に関する考察 Reviewed

    佐川康貴, 富山潤, 五十嵐豪, 吉田夏樹, 小川彰一

    コンクリート構造物の補修, 補強, アップグレード論文報告集   Vol. 17   page: 485 - 490   2017.10

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  66. 高温加熱を受けたコンクリートの力学的性質とひび割れの関係 Reviewed

    加藤 優志, 五十嵐 豪, 西脇 智哉

    コンクリート工学年次論文集   Vol. 39 ( 1 ) page: 1093 - 1098   2017.7

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  67. Microstructural changes in white Portland cement paste under the first drying process evaluated by WAXS, SAXS, and USAXS Reviewed International journal

    Ippei Maruyama, Naoki Sakamoto, Kunio Matsui, Go Igarashi

    Cement and concrete research   Vol. 91   page: 24 - 32   2017.1

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    Meso- and micro-scale structural changes in matured hardened cement paste dried slowly for 1.5 years at different relative humidities (RHs) are evaluated by small-angle X-ray scattering profiles covering a q range of 0.017 nm(-1)-30 nm(-1) with a fractal disc-shaped particle analysis and Guinier approximation. The fractal disc-shaped particle analysis revealed that calcium-silicate-hydrate (C-S-H) agglomerations are very thin (similar to 2.5 nm) and of relatively large width (similar to 35 nm) under high RH conditions. However, the agglomerations are segmented (in width) into similar to 10 nm below an RH of 40%. The Guinier approximation found the possibility that the scattering profiles in the range of 2 nm(-1)-8 nm(-1) correspond to a spacing between C-S-H monolayers and it showed stepwise changes at 40%-50% RH. The stepwise behavior of the distance between C-S-H monolayers may explain a kink in water vapor desorption at around 40% RH. (C) 2016 Elsevier Ltd. All rights reserved.

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  68. Experimental Study on Time-Dependent Behavior of Cracked UHP-FRCC Under Sustained Loads Reviewed International coauthorship International journal

    Tomoya Nishiwaki, Sukmin Kwon, Hiroto Otaki, Go Igarashi, Faiz U. A. Shaikh, Alessandro P. Fantilli

    CREEP BEHAVIOUR IN CRACKED SECTIONS OF FIBRE REINFORCED CONCRETE   Vol. 14   page: 101 - 109   2017

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    Ultra-high-performance fiber-reinforced cementitious composite (UHP-FRCC) has been successfully developed over the last decade. UHP-FRCC shows very high strength and high durability because of its very low water binder ratio and dense microstructures. Moreover, by incorporating a combination of steel and mineral fibers with different sizes in the mixture design, UHP-FRCC also exhibits high ductility and high energy absorption capacity, even under uniaxial tensile stress. The high ductility of UHP-FRCC materials shows strain hardening behavior with multiple cracking after the occurrence of the first crack. While extensive research on the tensile and bending behavior of this composite under short-term loading is reported, only limited results can be found on time-dependent behavior of UHP-FRCC under sustained long-term loading, which is strongly related to the situation of real structures. This paper presents experimental results concerning the time-dependent behavior of cracked UHP-FRCC specimens under sustained bending load. In bending creep test, sustained load with 50 % of the pre-cracking load was applied to a pair of prismatic specimens of 50 x 100 x 400 mm under a 4-point bending setup. The performance of UHP-FRCC is compared with those of conventional fiber reinforced cementitious composites(FRCC) using steel and synthetic fibers, which are investigated within the Round Robin Test (RRT) organized by RILEM TC 261-CCF. The results showed that UHP-FRCC exhibited smaller creep deformation at the sustained loading condition than the conventional FRCC, even when the initial deformation of the UHP-FRCC is much larger than the conventional FRCC. Cracking pattern, in terms of crack width and number of cracks, was also studied in both composites under sustained loads. As a result, the superior resistance of UHP-FRCC was obtained with respect to conventional FRCC.

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  69. Experimental study on the tensile and bending creep behavior of cracked UHP-FRCC Reviewed International coauthorship International journal

    T. Nishiwaki, H. Otaki, G. Igarashi, S. Kwon, F. Shaikh, A. P. Fantilli

    Mechanics of Structures and Materials: Advancements and Challenges - Proceedings of the 24th Australasian Conference on the Mechanics of Structures and Materials, ACMSM24 2016     page: 149 - 154   2017

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    Ultra-High-Performance Fiber-Reinforced Cementitious Composite (UHP-FRCC) shows very high strength and durability due to its very dense microstructure. While extensive research on the tensile and bending behavior of this composite under short-term loading has been reported, limited results are available on the time dependent behavior of UHP-FRCC under sustained loading, which are strongly related to the real-life-structures. This paper presents experimental results concerning creep behavior of cracked UHP-FRCC specimens under sustained tensile and bending loads up to 28 days. Under uniaxial tension, the load is applied to dog-bone type specimens. In the case of bending creep test, a sustained load is applied to a pair of prismatic specimens in a 4-point bending setup. The results show that UHP-FRCC exhibits low creep deformation under both these loading conditions. Furthermore, deflection hardening behavior lasts under Cracking behavior in terms of crack width and number of cracks under sustained loads in both composites is also studied and their comparisons are presented in the paper.

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  70. FUNDAMENTAL STUDY ON THE MECHANISM OF EXPANSION GENERATION BY ALKALI-SILICA GEL FROM ALKALI-SILICA REACTION

    OSAWA Norihisa, IGARASHI Go, YAMADA Kazuo, NISHIWAKI Tomoya

    Cement Science and Concrete Technology   Vol. 71 ( 1 ) page: 272 - 279   2017

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    <p>Although it is apparent that the deterioration due to alkali silica reaction is caused by the expansion produced by alkali-silica gel generated by the reaction between alkali and some reactive silicious minerals in alkali-reactive aggregate, there is still controversial for the mechanism of alkali-silica gel staying in the reactive aggregate and producing the expansion pressure and cracks in the concrete. Therefore, this paper tried to identify the mechanism of expansion pressure through some simplified element test using highly reactive andesite, which focuses on alkali-silica gel leaching / staying in the reactive aggregate. A series of experiments, the fluorescent observation of the alkali-silica gel distribution appeared on the cut surface of the reactive aggregate, which immersed into some kind of alkali solutions, hardened gypsum pastes or hardened cement pastes and the crack distribution in the cut surface of the cement paste matrix was carried out. As a result, the alkali-silica gel leached out and did not stay in the reactive aggregate without dense hardened cement paste matrix around. Furthermore, the alkali-silica gel in the dense hardened cement paste seems leach gradually from the reactive aggregate into hardened cement paste matrix without any visible cracking and this trend should be accelerated in case of high temperature or high water to binder ratio.</p>

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  71. Self-Healing Capability of Ultra-High-Performance Fiber-Reinforced Cementitious Composites (UHP-FRCC) with PVA fibers Reviewed International journal

    Tomoya Nishiwaki, Haruka Sasaki, Sukmin Kwon, Go Igarashi, Hirozo Mihashi

    HealCON conference     2016.12

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  72. 超高強度高靭性繊維補強セメント系複合材料の収縮性状に関する基礎的研究 Reviewed

    高桑 謙吾, 西脇 智哉, Kwon Sukmin, 五十嵐 豪

    コンクリート工学年次論文集   Vol. 38 ( 1 ) page: 537 - 542   2016.7

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  73. 産業副産物系混和材料を用いた繊維補強セメント系複合材料の自己治癒性能 Reviewed

    大坂 祐樹, 佐々木 悠, 五十嵐 豪, 西脇 智哉

    コンクリート工学年次論文集   Vol. 38 ( 1 ) page: 1683 - 1688   2016.7

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  74. 合成エトリンガイトの体積変化メカニズムに関する基礎的研究 Reviewed

    赤羽根 駿之介, 五十嵐 豪, 西脇 智哉, 丸山 一平

    コンクリート工学年次論文集   Vol. 38 ( 1 ) page: 579 - 584   2016.7

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  75. ゲルフルオレッセンス法によるASRゲルの観察条件に関する一考察 Reviewed

    五十嵐 豪, 山田 一夫, 小川 彰一

    コンクリート工学年次論文集   Vol. 38 ( 1 ) page: 1047 - 1052   2016.7

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  76. フライアッシュを大量に使用したUHP-FRCCの力学特製 Reviewed

    鈴木 慶汰, Kwon Sukmin, 西脇 智哉, 五十嵐 豪

    コンクリート工学年次論文集   Vol. 38 ( 1 ) page: 303 - 308   2016.7

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  77. IMAGE ANALYSIS OF ALKALI-AGGREGATE GEL IN CONCRETE PRISM TEST WITH ALKALI-WRAPPING Reviewed International coauthorship International journal

    G. Igarashi, K. Yamada, Y. Xu, H. Wong, S. Hirono, S. Ogawa

    Proceedings of International Conference on Alkali-Aggregate Reaction     2016.7

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  78. 1150oCまでの高温履歴を受けたセメント硬化体の力学的性質 Reviewed

    加藤 優志, 五十嵐 豪, 西脇 智哉

    コンクリート工学年次論文集   Vol. 38 ( 1 ) page: 687 - 692   2016.7

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  79. Numerical Approach towards Aging Management of Concrete Structures: Material Strength Evaluation in a Massive Concrete Structure under One-Sided Heating Reviewed International journal

    Ippei Maruyama, Go Igarashi

    Journal of Advanced Concrete Technology   Vol. 13 ( 11 ) page: 500 - 527   2015.11

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    For the purpose of performance evaluation of an existing reinforced concrete member, a chemo-thermo-hygro model to predict the spatial and temporal changes of physical properties of concrete in the member, named the "Computational Cement-Based Material Model (CCBM)", was proposed. This proposed simulation model includes models of rate of hydration of cement minerals, phase composition, and resultant properties of cement paste (i.e., compressive strength, Young's modulus, Poisson's ratio, thermal expansion coefficient, autogenous shrinkage, drying shrinkage, heat capacity, heat transfer coefficient, water vapor sorption isotherms, and water transfer coefficient). Furthermore, the model for compressive strength of concrete considered the variation in cement paste strength due to its colloidal features as well as micro-defects produced around aggregate due to differences in volume between aggregates and mortar upon heating and drying. The concrete properties of spatial distribution and temporal changes were evaluated by coupling these models with heat and water transport. Validation of these models was achieved by using existing experimental data. Using this CCBM, a thick concrete wall made with moderate Portland cement with a water-to-cement ratio of 0.55 under one-sided heating was simulated and potential problems that can arise during an integrity evaluation were discussed. If the required compressive strength, which was assessed within 91 days of placement, remains unchanged, an additional hydration process can build an adequate strength margin to overcome the risk of strength reduction due to heat and drying. However, in the case that the required strength is increased due to a re-evaluated risk, such as the magnitude of an earthquake, performance evaluation is not trivial as the core sample taken from the side where the execution of sampling is possible could exhibit a greater strength than the average strength of the target concrete member. Therefore, numerical evaluation might aid in this kind of situation.

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  80. Influence of mineral composition of siliceous rock on its volume change Reviewed International journal

    Go Igarashi, Ippei Maruyama, Yukiko Nishioka, Hidekazu Yoshida

    Construction and Building Materials   Vol. 94   page: 701 - 709   2015.9

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    A method for predicting volume changes of aggregate during variations in humidity and temperature was studied. Siliceous rock aggregates commercially available in Japan were sampled from various regions and subjected to XRD (X-ray diffraction) analysis, thermal analysis, and volume change experiments. Drying shrinkage strain and the thermal expansion coefficient of the aggregates were found to be related to their mineral composition and bound water content. Experiments confirmed that drying shrinkage was correlated with the chlorite and bound water content of the aggregate, and that thermal expansion coefficients were correlated with the aggregate's quartz content. (C) 2015 Elsevier Ltd. All rights reserved.

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  81. 超軽量断熱コンクリートの耐スケーリング性向上に関する実験的検討 Reviewed

    加藤 優志, Kwon Sukmin, 五十嵐 豪, 西脇 智哉

    コンクリート工学年次論文集   Vol. 37 ( 1 ) page: 1435 - 1440   2015.7

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  82. 拡張BET理論によるCa/Si比の異なる合成C-S-Hの水蒸気吸着性状の分析 Reviewed

    五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 37 ( 1 ) page: 499 - 504   2015.7

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  83. PVA繊維を用いたFRCCの耐凍害性と自己治癒性能に関する研究 Reviewed

    佐々木 悠, 寺田 健悟, 五十嵐 豪, 西脇 智哉

    コンクリート工学年次論文集   Vol. 37 ( 1 ) page: 1321 - 1326   2015.7

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  84. Bimodal behavior of C-S-H interpreted from short-term length change and water vapor sorption isotherms of hardened cement paste Reviewed International journal

    Ippei Maruyama, Go Igarashi, Yukiko Nishioka

    Cement and Concrete Research   Vol. 73   page: 158 - 168   2015.7

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    Short-term length change isotherms (SLCIs) and water vapor sorption isotherms are useful to eliminate the effects of the colloidal features of C-S-H. SLCIs of hardened cement pastes initially conditioned by drying to equilibrium at different relative humidities (RHs) were measured over a complete RH loop between 5% and 98%. Based on the correlation between incremental thickness of adsorption and incremental strain from 40% to 98% RH, the basal spacing of C-S-H above 40% RH appears to increase further with increasing water vapor sorption. However, no correlation of these values was found from 5% to 40% RH and the basal spacing is considered stable in this domain. These properties of C-S-H are directly related to its isothermal volume change as a function of RH. It can be concluded that the dominant shrinkage driver above 40% RH is disjoining or hydration pressure and that below 40% RH is change in surface energy. (C) 2015 Elsevier Ltd. All rights reserved.

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  85. Strength and Young's modulus change in concrete due to long-term drying and heating up to 90 oC Reviewed International journal

    Ippei Maruyama, Hiroshi Sasano, Yukiko Nishioka, Go Igarashi

    Cement and Concrete Research   Vol. 66   page: 48 - 63   2014.12

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    Understanding changes in the strength and Young's modulus of concrete under long-term drying or heating less than or equal to 90 degrees C is crucial for managing the aging of industrial buildings. We collected experimental data on changes in the physical properties of concrete components, aggregates, cement pastes, and concretes containing different aggregates and mortar under different heating and drying conditions. The change in compressive strength of concretes under various drying or heating conditions was explained by the behavior of the cement paste matrix and damage accumulation caused by differences in volume changes between the aggregate and mortar. In contrast, the variation in the Young's modulus of concrete caused by the drying or heating conditions was mainly explained by the increase in the number of voids due to internal cracking in the concrete. (C) 2014 Elsevier Ltd. All rights reserved.

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  86. 拡張BET理論に基づくセメントペーストの水蒸気吸着等温モデルの提案 Reviewed

    五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 36 ( 1 ) page: 622 - 627   2014.7

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  87. Cement Reaction and Resultant Physical Properties of Cement Paste Reviewed International journal

    Ippei Maruyama, Go Igarashi

    Journal of Advanced Concrete Technology   Vol. 12 ( 6 ) page: 200 - 213   2014.6

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    The body of data about the reaction kinetics of cement has greatly grown in recent years, and in terms of techniques for the prediction of the resulting hydrate formation phases, databases contributing to thermodynamic equilibrium calculations have been developed and are growing increasingly sophisticated. On the other hand, though many studies on cement aim to contribute to concrete engineering and numerical model researchers have pointed out the necessity of shedding light on the relationship between the microstructures generated by hydration and physical properties, such data remains scarce. This study investigated Portland cements using two commonly used water-cement ratios and three types of mineral compositions in the material age range of up to one year. The phase composition in relation to cement hydration was determined by X-ray powder diffraction and Rietveld analysis. In terms of physical properties, compressive strength and Young's modulus were measured through loading tests, and Young's modulus and Poisson's ratio were also obtained from the ultrasonic pulse propagation velocity of longitudinal and transverse waves. Further, water vapor adsorption tests to shed light on moisture behavior were conducted, yielding the BET specific surface area. Thermal conductivity, an important determinant of thermal behavior, was measured using the transient hot wire method. On the premise of the application of these physical properties to numerical calculations, their correlation with the information obtained from the phase composition was considered, leading to the proposal of simple and relatively high-accuracy empirical formulas. Further, background information about raising the correlation of these empirical formulas was also discussed.

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  88. Microstructural and bulk property changes in hardened cement paste during the first drying process Reviewed International journal

    Ippei Maruyama, Yukiko Nishioka, Go Igarashi, Kunio Matsui

    Cement and Concrete Research   Vol. 58   page: 20 - 34   2014.4

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    This paper reports the microstructural changes and resultant bulk physical property changes in hardened cement paste (hcp) during the first desorption process. The microstructural changes and solid-phase changes were evaluated by water vapor sorption, nitrogen sorption, ultrasonic velocity, and Si-29 and (27)AI nuclear magnetic resonance. Strength, Young's modulus, and drying shrinkage were also examined. The first drying process increased the volume of macropores and decreased the volume of mesopores and interlayer spaces. Furthermore, in the first drying process globule clusters were interconnected. During the first desorption, the strength increased for samples cured at 100% to 90% RH, decreased for 90% to 40% RH, and increased again for 40% to 11% RH. This behavior is explained by both microstructural changes in hcp and C-S-H globule densification. The drying shrinkage strains during rapid drying and slow drying were compared and the effects of the microstructural changes and evaporation were separated. (C) 2014 Elsevier Ltd. All rights reserved.

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  89. Strain and thermal expansion coefficients of various cement pastes during hydration at early ages Reviewed International journal

    Ippei Maruyama, Atsushi Teramoto, Go Igarashi

    Materials and Structures   Vol. 47 ( 1-2 ) page: 27 - 37   2014.1

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    Cement pastes undergo elevated temperature histories due to hydration heat liberation at early ages. Thermal expansion coefficients of cement paste and concrete change with age, showing a decrease after mixing, a subsequent minimum and then a gradual increase. These changes contribute to thermal strain. In this study, effects of water-cement ratio and cement type on volume changes in early-age cement pastes were experimentally examined using a newly developed apparatus capable of simultaneously determining both thermal expansion coefficient and total strain of cement pastes. The dependence of the thermal expansion coefficient on hydration was affected by water-cement ratio, cement type, elevated temperature history and particularly by the free water content of the cement pastes, while the relationship between thermal expansion coefficient and free water content varied with water-cement ratio. A notable increase in thermal expansion coefficient at early ages was observed when water-cement ratio was low and alite content in cement was high. At a water-cement ratio of 0.30, low-heat Portland cement paste resulted in a small total strain while moderate-heat and ordinary Portland cement pastes showed larger strains. Because no particular difference was observed in the thermal strains, shrinkage in the low-heat Portland cement paste was attributed to autogenous strain. At a water-cement ratio of 0.40, self-desiccation had a significant influence upon autogenous shrinkage and dependence of thermal expansion coefficient on hydration, and the effect of the mineral composition of cements was notable. However, for cement pastes with a water cement ratio of 0.55, no significant effects of self-desiccation were observed, probably because considerable excess water was present.

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  90. EVALUATION OF IRRADIATION EFFECTS ON CONCRETE STRUCTURE -BACKGROUND AND PREPARATION OF NEUTRON IRRADIATION TEST- Reviewed International journal

    Ippei Maruyama, Osamu Kontani, Shohei Sawada, Osamu Sato, Go Igarashi, Masayuki Takizawa

    PROCEEDINGS OF THE ASME POWER CONFERENCE, 2013, VOL 2   Vol. 2   2014

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    Methods for assessing the soundness of concrete exposed to irradiation are being developed within the framework of a project of the Nuclear Regulation Authority (NRA) "Japan Ageing Management Program for System Safety". This paper presents the background of this project and recent research works. The major reason for deterioration of concrete under irradiation conditions is expansion of aggregate due to neutron and gamma-ray irradiation. Dislocation of atoms in covalent structures of aggregate minerals, and resultant lattice constant change and alteration to amorphous phase are produced by fast neutrons. In addition, through electronic exertion, some energy deposition is accumulated as permanent distortion/strain in atomic structures. Other effects are also summarized. We plan to conduct a neutron irradiation test from May 2013. In selecting mix proportions and concrete components for the irradiation test program, sample size as a function of capsule size and gamma-heating, cement type, and aggregate size and type are determined based on preliminary experiments.

    DOI: 10.1115/POWER2013-98114

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  91. EVALUATION OF IRRADIATION EFFECTS ON CONCRETE STRUCTURE -BACKGROUND AND PREPARATION OF NEUTRON IRRADIATION TEST-

    Maruyama Ippei, Kontani Osamu, Sawada Shohei, Sato Osamu, Igarashi Go, Takizawa Masayuki

    PROCEEDINGS OF THE ASME POWER CONFERENCE, 2013, VOL 2     2014

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  92. けい酸カルシウム板の中性化と留付け強度低下に関する研究-天井落下事故を生じた材料の分析- Reviewed

    丸山 一平, 五十嵐 豪, 西岡 由紀子, 谷川 恭雄

    日本建築学会構造系論文集   Vol. 78 ( 689 ) page: 1203 - 1208   2013.7

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    DOI: 10.3130/aijs.78.1203

  93. Alteration of sorption properties of hardened cement paste under drying process Reviewed

    Ippei Maruyama, Yukiko Nishioka, Ai Sugie, Go Igarashi

    Zairyo/Journal of the Society of Materials Science, Japan   Vol. 62 ( 3 ) page: 219 - 223   2013.3

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    Hydrated hardened cement paste samples using white cement were cured under different relative humidity con- ditions. After 180-day drying, Adsorption and desorption isotherms as well as chemically bound water of cured hard- ened cement paste were measured. Based on the adsorption data, it was concluded that drying process has two dif- ferent effects on a sorption property. One effect was seen in drying process over 70%RH. Capillary pore with more than 2nm size was collapsed and amount of capillary condensation is decreased as it is dried in the lower relative humidity. The second effect was seen in drying process under below 60%RH. The vapor BET surface area was dra- matically decreased as cement paste cured in lower relative humidity. From the change of chemically bound water and vapor BET surface area, it was deduced that a reaction of silanol to siloxane bond in C-S-H poses decrease in vapor adsorption sites. © 2013 The Society of Materials Science, Japan.

    DOI: 10.2472/jsms.62.219

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  94. Microstructure and strength change of hardened cement paste under drying process Reviewed International journal

    Ippei Maruyama, Yukiko Nishioka, Go Igarashi

    Sustainable Construction Materials and Technologies   Vol. 2013-August   2013

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    Water vapor sorption isotherms, nitrogen sorption isotherms, and bending strength of cement paste cured with different relative humidity for 1 year are measured. Effect of drying on microstructure has two ways. One is nano-scale effect, in which nano-scale pore among globules is collapsed due to capillary tension or solution and re-precipitation cycle of C-S-H. The other one is atomic-scale effect, in which water adsorption sites are reduced due to drying by changing of other than Si network. From such effect, cement paste shows different nature of microstructure according to thermodynamic conditions, and resultantly, the physical properties are altered.

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  95. 各種ポルトランドセメントおよび高炉スラグ微粉末を用いたセメント硬化体の結合水量と水蒸気BET比表面積の関係 Reviewed

    五十嵐 豪, 寺本 篤史, 丸山 一平

    日本建築学会構造系論文集   Vol. 77 ( 682 ) page: 1819 - 1828   2012.12

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    DOI: 10.3130/aijs.77.1819

  96. 水和反応過程におけるセメント硬化体の熱伝導率と相組成の関係 Reviewed

    五十嵐 豪, 杉江 和, 丸山 一平

    コンクリート工学年次論文集   Vol. 34 ( 1 ) page: 538 - 543   2012.7

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  97. 早期脱型を行ったコンクリートにおける中性化進行予測 Reviewed

    西岡 由紀子, 五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 34 ( 1 ) page: 658 - 663   2012.7

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  98. Prediction of strength of concrete in long-lived concrete member Reviewed

    Ippei Maruyama, Go Igarashi

    Journal of Structural and Construction Engineering   Vol. 77 ( 673 ) page: 323 - 332   2012.3

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    Prediction system for compressive concrete strength in aged structural member is proposed. This system is composed of models of rate of hydration, cement paste phase composition, heat production, specific heat, compressive strength, vapor desorption isotherm, coupled heat and moisture Iransfer. Each model is verified through experimental data This system is aiming for the structural member which can not beaccessed or can not be evaluated by the core sample test. Using non-destructive data or quality conlrol sample's data, this system might illustrate the distribution and development of concrete staigth in structural member properly. From the calculation results for a concrete member exposed to high temperature condition, strength development as well as distribution is quite sensitive to the boundary condition, and this concludes that the evaluation of structural member under such special condition needs precise boundary conditions.

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  99. 「200N/mm2級超高強度コンクリートの強度・自己収縮特性における初期高温履歴の影響メカニズム」に対する討論(松田 拓,野口貴文,蓮尾孝一,小出貴夫,鈴木康範著) Reviewed

    丸山一平, 寺本篤史, 五十嵐豪

    日本建築学会構造系論文集   Vol. 76 ( 666 ) page: 1383-1392   2012.3

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  100. 温度履歴を受ける各種ポルトランドセメントペーストの若材齢体積変化 Reviewed

    寺本 篤史, 五十嵐 豪, 丸山 一平

    日本建築学会構造系論文集   Vol. 77 ( 672 ) page: 153 - 159   2012.2

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  101. Hydration of 3CaO · Al2O3 and 4CaO · Al2O3 · Fe2O3 in Portland cement - Hydration system of Portland cement part 2 Reviewed

    Maruyama I., Matsushita T., Igarashi G., Noguchi T., Hosokawa Y., Yamada K.

    Journal of Structural and Construction Engineering   Vol. 76 ( 659 ) page: 1 - 8   2011.12

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    Hydration process of many kinds of cement paste is investigated by powder X-ray diffraction (XRD)/Rietveld analysis. The parameters of the present study are type of cement (Ordinary Portland cement, Low heat cement, and Eco-cement), water to cement ratio (0.50, 0.35), and curing temperature (283, 293, 313K). In this contribution, reaction of aluminate phase (3CaO·Al 2O 3) and ferrite phase (4CaO·Al 2O 3· Fe 2O 3) are focused and evaluated. Experimental results show that the reaction of both aluminate phase and ferrite phase are affected by the temperature and presence of calcite. When system includes calcite, monocarbonate aluminate is mainly produced, rather than ettringite. And in the case of high curing temperature, Al 2O 3 is reacted as amorphous. Regarding ferrite phase, the reaction degree at the age of 1 year decrease as curing temperature increases, this can be presumed due to dense amorphous phase around cement minerals. Based on these experimental facts, simple hydration model is proposed to evaluate development of hydration degree of aluminate phase and ferrite phase.

    DOI: 10.3130/aijs.76.1

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  102. セメント硬化体中の水分移動に関する基礎研究 Reviewed

    丸山 一平, 五十嵐 豪, 岸 直哉

    日本建築学会構造系論文集   Vol. 76 ( 668 ) page: 1737 - 1744   2011.10

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  103. 異なる平衡相対湿度条件下でのセメント硬化体のヤング率と相組成の関係 Reviewed

    五十嵐 豪, 堀口 直也, 丸山 一平

    コンクリート工学年次論文集   Vol. 33 ( 1 ) page: 365 - 370   2011.7

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  104. 含水率の変化による骨材の体積変化に関する基礎研究 Reviewed

    堀口 直也, 五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 33 ( 1 ) page: 131 - 136   2011.7

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  105. セメント硬化体の水蒸気吸着等温線モデル Reviewed

    丸山 一平, 五十嵐 豪

    日本建築学会構造系論文集   Vol. 76 ( 664 ) page: 1033 - 1041   2011.6

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    DOI: 10.3130/aijs.76.1033

  106. ポルトランドセメントの水和反応と水蒸気吸着試験による硬化体の比表面積 Reviewed

    丸山 一平, 五十嵐 豪

    日本建築学会構造系論文集   Vol. 76 ( 663 ) page: 865 - 873   2011.5

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  107. Hydration model of Portland cement for structural integrity analysis Reviewed

    I. Maruyama, G. Igarashi

    Proceedings of 4th International Symposium on the Ageing Management & Maintenance of Nuclear Power Plants (ISaG2010)     page: 123 - 144   2011.3

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  108. セメント硬化体のヤング率およびポアソン比の相対湿度依存性 Reviewed

    堀口 直也, 五十嵐 豪, 丸山 一平

    日本建築学会構造系論文集   Vol. 76 ( 660 ) page: 231 - 236   2011.2

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    DOI: 10.3130/aijs.76.231

  109. 普通ポルトランドセメントを用いたセメント硬化体の相組成と力学的性質の関係 Reviewed

    五十嵐 豪, 丸山 一平

    日本建築学会構造系論文集   Vol. 76 ( 660 ) page: 213 - 222   2011.2

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    DOI: 10.3130/aijs.76.213

  110. STUDY ON THE EFFECT OF AGGREGATE VOLUME FRACTION ON DYNAMIC ELASTICITY IN HARDENING PROCESS Reviewed

    TERAMOTO Atsushi, IGARASHI Go, MARUYAMA Ippei

    Cement Science and Concrete Technology   Vol. 65 ( 1 ) page: 132 - 139   2011

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    In this contribution, velocities of elastic wave and shear wave were obtained by ultrasonic pulse method with hardening cement paste and mortar whose water to cement ratio was 0.30, 0.40 and 0.55. And four classes(cement paste, 20%, 40%, 60%)of aggregate volume fraction ratio were prepared in each water to cement ratios. Then, Poisson's ratios and dynamic elasticity were calculated from experimental results of elastic wave, shear wave and bulk density at predefined concrete age. As a result, steep reduction of Poisson's ratio was observed in early age in all specimens, however, decreasing ratio was different from each aggregate volume fraction. And it was reported that this time dependent changes of Poisson's ratio made an influence to accuracy of composite model for predicting the dynamic elasticity in the case of the range over 40% volume fraction of aggregate. In that case, the estimated values were improved by taking time dependent changes of Poisson's ratio into consideration. On the other hand, the estimated value by Hashin - Hansen model of mortar whose volume fraction of aggregate was 60% showed much higher value than measuring. And this difference was considered to be occurred due to large amount of void content than that of lower volume fraction of aggregate.

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  111. RELATIONSHIP BETWEEN SPECIFIC SURFACE AREA OF C-S-H BY VAPOR ADRORPTION ISOTHERM AND SILANOL GROUP ON THE SURFACE OF C-S-H Reviewed

    IGARASHI Go, MARUYAMA Ippei

    Cement Science and Concrete Technology   Vol. 65 ( 1 ) page: 140 - 145   2011

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    It is known that the evaluation of volume change of hardened cement paste is controlled the hydration force, which derived from the potential of hydroxyl group. And then, for the evaluation of volume change due to hardened cement paste drying, specific surface area of calcium silicate hydrate in the hardened cement paste, which affects statistical adsorption vapor thickness in the hardened cement paste, is focused. The synthesized calcium silicate hydrate(synthesized C-S-H), which calcium to silicate molar ratio is 0.9, 1.1, 1.3, 1.5, is prepared. The specific surface area of each C-S-H, which pre-treated under degased and each temperature(30degC, 105degC, 150degC), is measured by 20degC vapor adsorption isotherm and B.E.T theory. The H<sub>2</sub>O/Si molar ratio of each C-S-H, which humidificated under each relative humidity(0%RH, 60%RH, 95%RH), are measured by Thermal Gravity Analysis. Based on thermodynamic model of silanol group on the C-S-H by Nonat, the unit model of C-S-H, which has four silanol group(two variable -SiOH, a -SiOH, a -SiOCaOH) is proposed. the number of water molecule, which adsorbs on each silanol groups, is identified and the specific surface area model of C-S-H in adsorption process are proposed. The proposed model can predict the specific surface area of various C-S-H, which has various Ca/Si molar ratio or pretreated each temperature drying condition.

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  112. ポルトランドセメントの鉱物組成と硬化体の収縮特性に関する考察 Reviewed

    丸山 一平, 岸 直哉, 寺本 篤史, 五十嵐 豪

    コンクリート工学年次論文集   Vol. 32 ( 1 ) page: 347 - 352   2010.7

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  113. セメント硬化体の若材齢時におけるポアソン比の経時変化 Reviewed

    五十嵐 豪, 丸山 一平, 寺本 篤史, 堀口 直也

    コンクリート工学年次論文集   Vol. 32 ( 1 ) page: 281 - 286   2010.7

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  114. HYDERATION PRESSURE IN HARDENED CEMENT PASTE CONTAINING BLUST FURNACE SLAG Reviewed

    MARUYAMA Ippei, KISHI Naoya, IGARASHI Go

    Cement Science and Concrete Technology   Vol. 64 ( 1 ) page: 89 - 95   2010

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    Hydration pressure of hardened cement paste containing blast furnace slag with 30% or 45% replacement of base ordinary Portland cement with water to binder ratio of 0.40 and 0.55 was determined experimentally. The experimental study is composed of measuring adsorption and desorption isotherm, length-change isotherm, Young's modulus and Poisson's ratio, and density of hardened cement paste.<br/>It is experimentally confirmed that 1)the desorption isotherm of hardened cement paste containing blast furnace slag has the larger water content than those of hardened cement paste with Portland cement, 2)Drying shrinkage of hardened cement paste containing slag with a condition of W/B=0.55 is larger than those of hardened cement paste with Portland cement especially in the range of relative humidity lower than 60%RH, 3)the drying shrinkage of hardened cement paste containing slag with a condition of W/B=0.40 showed almost the similar amount compared to those of hardened cement paste with Portland cement.<br/>Based on the hydration pressure theory which is proposed by the first author is adopted to this experimental result, and, according to this result, it is presented that the surface of hardened cement paste containing blast furnace slag has the larger interaction with water than that of hardened cement paste with ordinary Portland cement.<br/>This is the main factor for that hardened cement paste with blast furnace slag exhibits the large drying shrinkage.

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  115. RELATIONSHIP BETWEEN SPECIFIC SURFACE AREA AND HYDRATION REACTION OF HARDENED CEMENT PASTE Reviewed

    IGARASHI Go, MARUYAMA Ippei

    Cement Science and Concrete Technology   Vol. 64 ( 1 ) page: 103 - 110   2010

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    For the evaluation of strength development with or without elevated temperature due to heat of hydration, specific surface area of hardened cement paste, which affects the strength of hardened cement paste, is focused. The hardened cement paste(hcp)of water to cement ratio of 55% and 40% with 20℃ constant temperature and maximum 60℃ temperature as mass concrete temperature history is prepared. The amount of C-S-H and CaO/SiO<sub>2</sub> molar ratio of C-S-H are identified by XRD/Rietveld analysis and phase composition model, and at the same time, specific surface area is measured by moisture sorption isotherm and BET theory. Additionally, specific surface area of hardened cement paste is compared to that of synthesized C-S-H. As a result, 1)when the hcp is subjected to elevated temperature history in early ages, the development of specific surface area of hardened cement paste increase rapidly in early age but het a peak, 2)CaO/SiO<sub>2</sub> molar ratio decreases rapidly in early age but increases gradually in a long term, 3)specific surface area of C-S-H in hardened cement paste for CaO/SiO<sub>2</sub> molar ratio is higher than synthesized C-S-H, and 4)specific surface area of hardened cement paste with/without elevated temperature history can be evaluated by the amount of C-S-H in hardened cement paste with a single curve.

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  116. MECHANISM OFMOISTURE SORPTION HYSTERESIS OF HARDEND CEMENT PASTE Reviewed

    MARUYAMA Ippei, IGARASHI Go

    Cement Science and Concrete Technology   Vol. 64 ( 1 ) page: 96 - 102   2010

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    Mechanism of moisture sorption hysteresis of hardened cement paste is discussed in this paper. Firstly, cement paste with three type of cement and two different water to cement ratioes are tested for sorption isotherm. There exist the hysteresis in the range lower than 30%Rh. This phenomena is not common for normal porous materials. It is experimentally found that the adsorption isotherm as well as desorption isotherm is on the B.E.T plot, and the surface area calculated B.E.T theory from adsorption process and those from desorption process has the linear relationship. This results implies that, in the process of sorption isotherm test, some reproductive chemical reaction occur. Secondly, hysteresis experiment in high relative humidity of hardened cement paste is conducted. The experimental data in re-adsorption process shows convex downwards. This decrease in water content with increase in relative humidity indicates that the surface area of hardened cement is decreased. The two experimental data showed the evidence that the chemical reaction of hydrate occurs behind the desorption or adsorption process. In order to confirm this reaction, IR spectra and NMR spectra of synthesized C-S-H under different relative humidities, i.e. 95%RH, 60%RH, 0%RH(=105℃-dry for 24hours)were measured. According to the experiment, the Si network is increased even in the drying process from 95% RH to 60% RH. This reveals that the C-S-H or hardened cement paste is not the stable substance in desorption or adsorption process with regard to water.

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  117. The effect of elevated temperature history on properties and hydration of hardened cement paste Reviewed International journal

    G. Igarashi, N. Takamatsu, K. Yamada, I. Maruyama

    Proceedings of 4th International Conference on Construction Materials: Performance, Innovations, and Structural Implications (ConMat’09)     page: 1135 - 1141   2009.8

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  118. 高炉スラグ微粉末を用いたセメント硬化体の若材齢体積変化と水和反応に関する研究 Reviewed

    高松 伸之, 丸山 一平, 五十嵐 豪, 寺本 篤史

    コンクリート工学年次論文集   Vol. 31 ( 1 ) page: 187 - 192   2009.7

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  119. 高温履歴を受けるセメント硬化体中の普通ポルトランドセメントの水和反応と硬化体の物性 Reviewed

    五十嵐 豪, 丸山 一平, 高松 伸之, 山田 一夫

    コンクリート工学年次論文集   Vol. 31 ( 1 ) page: 715 - 720   2009.7

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MISC 125

  1. Pirot Study on Thermal, Physico-Chemical, and Mechanical Behaviour of Concrete to understand the failure behavior of Fukushima Daiichi Nuclear Power Plant Reactor Pressure Vessel Pedestals Project overview

        page: 2L16   2024.9

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  2. Drying shrinkage of FA cement paste under the first drying Reviewed

    Ippei Maruyama, Miki Segawa, Ryo Kurihara, Aili Abudushalamu, Go Igarashi

    CONCREEP12     2024.6

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  3. EVALUATION OF CHEMICAL COMPOSITION AND STRUCTURE OF DECOMPOSED C-A-S-H WITH CARBONATION

    TOMITA Sayuri, IGARASHI Go, YAMADA Kazuo, MARUYAMA Ippei

    Cement Science and Concrete Technology   Vol. 77 ( 1 ) page: 62 - 70   2024.3

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    <p>In this study, we focused on the structural changes and phase composition of Calcium aluminate silicate hydrate (C-A-S-H) before and after carbonation to confirm its transformation by carbonation in the medium humidity range and its subsequent change after contact with liquid water. Based on the results of NMR, SEM-EDS analysis, and liquid phase composition analysis of the synthesized C-A-S-H, the structure was identified from the Ca/Si, Al/Si, H/Si, and Na/Si ratios and a schematic model was presented. After carbonation, the formation of vaterite, calcite, and aluminosilicate gel were confirmed. Unlike synthetic vaterite, vaterite of carbonated sample did not undergo a phase transition at 450℃. Thermogravimetric analysis demonstrated that carbonated sample’s vaterite undergoes a phase transition at 450-600℃. The vaterite underwent a phase change after immersion in the liquid phase and was confirmed to be all calcite. The aluminosilicate gel was found to have compositions of Al/Si=0.16, Ca/Si=0.09, and Na/Si=0.09.</p>

    DOI: 10.14250/cement.77.62

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  4. 1H-NMR RELAXOMETRY ANALYSIS OF WATER CONTENT CHANGES IN HARDENED CEMENT PASTES DURING CARBONATION PROCESS

    IGAMI Ryusei, AILI Abudushalamu, IGARASHI Go, MARUYAMA Ippei

    Cement Science and Concrete Technology   Vol. 77 ( 1 ) page: 44 - 52   2024.3

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    <p>In this paper, <sup>1</sup>H-NMR Relaxometry is applied to carbonation phase and analyzes changes of chemically bound water content, mobile water content, and total water content in hardened cement paste with the progress of carbonation. The results showed that calcium hydroxide and C-S-H were carbonated at 20℃ and 85%RH. From the measurement of transverse relaxation time T<sub>2</sub> by CPMG method, it was confirmed that the transverse relaxation time of Interlayer and Gel pore increased with carbonation. There was a positive correlation between carbonation degree of calcium hydroxide calculated by thermogravimetric/differential thermal analysis and decreasing of chemically bound water measured by Solid echo method, confirming that chemically bound water in calcium hydroxide changed to mobile water due to carbonation. Regarding mobile water, the water content of Gel pore increased and that of Interlayer decreased in C-S-H during the initial stage of carbonation.</p>

    DOI: 10.14250/cement.77.44

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  5. TIME-DEPENDENT STRAIN DISTIBUTION OF MORTAR IN CONCRETE DURING WATER UPTAKE MONITORED BY DIGITAL IMAGE CORRELATION METHOD

    OGAWA Keigo, HASHIMOTO Chihiro, IGARASHI Go, MARUYAMA Ippei

    Cement Science and Concrete Technology   Vol. 77 ( 1 ) page: 222 - 230   2024.3

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    <p>In order to visualize liquid water movement in concrete, changes in the state of concrete when water is immersed on one surface against concrete in a dry state were visualized using a digital image correlation method that can detect minute deformations on the surface of the object. By obtaining the change over time of the principal strain distribution from the amount of deformation, deformations showing drying shrinkage and swelling caused by liquid water penetration in the cement paste section were visualized. Deviations from the linear relationship between water absorption and depth of penetration and the square root of time, indicating liquid water penetration into cementitious materials, were confirmed, indirectly indicating that water movement causes water absorption and swelling of the cement paste, even in concrete aggregate scale analysis.</p>

    DOI: 10.14250/cement.77.222

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  6. Effect of Expansive Additives on the Early Age Elastic Modulus Development of Cement Paste by Ambient Response Method (ARM)

    Mayank Gupta, Igarashi Go, Jose Granja, Miguel Azenha, Tetsuya Ishida

    RILEM Bookseries   Vol. 31   page: 319 - 327   2021

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    Expansive additives are being widely used as shrinkage reducing/compensating admixture to reduce the early-age cracking and chemical prestressing. Such expansive additives influence the composition of cement hydration products and mechanical properties (stiffness and strength) of the cement and concrete, which ultimately affects the early age deformation. In the current study, the EMM-ARM (Elastic Modulus Measurement by Ambient Response Method), is used because of its ability to continuously monitor cement's real-time stiffness development paste with expansive additives. Stiffness development of the cement paste with expansive additives is captured in the unrestrained condition by allowing the free expansion during the stiffness measurement. An expansive additive, based on free lime, with a 10% (by weight) cement replacement ratio is studied in the current work. Results from the EMM-ARM are compared to the elastic modulus measurement from the compression testing of cylindrical specimens, and the mechanisms of expansive action on the microstructure in early-age are discussed.

    DOI: 10.1007/978-3-030-72921-9_26

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  7. 水和物組成に基づいたセメント系固化材による火山灰質土の固化特性の分析

    高橋佑弥, 瀬川出, 五十嵐豪

    セメント技術大会講演要旨(CD-ROM)   Vol. 74th   2020

  8. 1332 Prediction of Compressive Strength of Concrete by Non-destructive Inspection based on Case Studies in Developing Countries

    MALIHA MAISHA, 西脇 智哉, 初 航, Dinil Pushpalal, 五十嵐 豪, 湯浅 昇

    材料施工   ( 2019 ) page: 663 - 664   2019.7

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  9. 1058 酸化亜鉛添加が高炉スラグ微粉末ベースジオポリマーに及ぼす影響の検討

    古江 翔子, 五十嵐 豪, 西脇 智哉

    材料施工   ( 2019 ) page: 115 - 116   2019.7

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  10. 1082 超高強度高靭性繊維補強セメント系複合材料を用いた梁の力学性能とその環境影響評価

    安達 由佳, 西脇 智哉, 五十嵐 豪

    材料施工   ( 2019 ) page: 163 - 164   2019.7

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  11. Estimation of concrete strength using non-destructive test methods based on field survey in developing countries

      ( 82 ) page: 105 - 108   2019.6

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  12. Control of fresh properties by addition of zinc oxide in blast furnace slag fine powder-base geopolymer

      ( 82 ) page: 121 - 124   2019.6

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  13. 「DEFのリスクを考える」に関するシンポジウム 委員会報告書

    川端雄一郎, 羽原俊祐, 小川彰一, 兵頭彦次, 吉田夏樹, 浅本晋吾, 東洋輔, 五十嵐豪, 上原元樹, 臼井達哉, 蔵重勲, 斎藤豪, 玉滝浩司, 寺本篤史, 取違剛, 松下哲郎, 野村博史, 宮本慎太郎, 村岡史朗, 森泰一郎, 西岡由紀子

    日本コンクリート工学会論文集   Vol. JCI-C98   2019

  14. 21541 原子力施設の新しいASR対策の考え方の提案 その 6 統括と今後課題

    江藤 淳二, 小川 彰一, 渋谷 和俊, 寺本 篤史, 五十嵐 豪, 山田 一夫, 丸山 一平

    構造II   ( 2018 ) page: 1081 - 1082   2018.7

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  15. 1130 イメージングプレートを用いた汚染コンクリート中のCs-137定量評価の基礎実験

    大澤 紀久, 山田 一夫, 竹内 幸生, 五十嵐 豪, 西脇 智哉

    材料施工   ( 2018 ) page: 259 - 260   2018.7

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  16. 21536 原子力施設の新しいASR対策の考え方の提案 その1 現在の課題

    山田 一夫, 江藤 淳二, 渋谷 和俊, 小川 彰一, 五十嵐 豪, 丸山 一平, 寺本 篤史

    構造II   ( 2018 ) page: 1071 - 1072   2018.7

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  17. 21537 原子力施設の新しいASR対策の考え方の提案 その2 新しい骨材のASR反応性評価フロー

    小川 彰一, 渋谷 和俊, 江藤 淳二, 寺本 篤史, 五十嵐 豪, 丸山 一平, 山田 一夫

    構造II   ( 2018 ) page: 1073 - 1074   2018.7

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  18. 21538 原子力施設の新しいASR対策の考え方の提案 その3 コアの促進膨張試験

    渋谷 和俊, 小川 彰一, 江藤 淳二, 五十嵐 豪, 寺本 篤史, 丸山 一平, 山田 一夫

    構造II   ( 2018 ) page: 1075 - 1076   2018.7

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  19. 21539 原子力施設の新しいASR対策の考え方の提案 その4 新しいASR診断フローとその対策

    五十嵐 豪, 江藤 淳二, 渋谷 和俊, 小川 彰一, 寺本 篤史, 丸山 一平, 山田 一夫

    構造II   ( 2018 ) page: 1077 - 1078   2018.7

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  20. 21540 原子力施設の新しいASR対策の考え方の提案 その5 ASR診断における数値解析の現状と課題

    寺本 篤史, 江藤 淳二, 渋谷 和俊, 小川 彰一, 五十嵐 豪, 丸山 一平, 山田 一夫

    構造II   ( 2018 ) page: 1079 - 1080   2018.7

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  21. 原子力関連施設コンクリートの新しいASR対策と診断

    山田一夫, 渋谷和俊, 小川彰一, 丸山一平, 寺本篤史, 五十嵐豪, 川端雄一郎, 江藤淳二

    日本コンクリート工学会論文集   Vol. JCI-C93   page: 281‐290   2017.9

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  22. 21625 原子力関連施設コンクリートのアルカリシリカ反応の評価と診断の新しい方法

    山田 一夫, 小川 彰一, 渋谷 和俊, 丸山 一平, 寺本 篤史, 五十嵐 豪, 江藤 淳二

    構造II   ( 2017 ) page: 1249 - 1250   2017.7

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  23. 1337 非破壊試験による高温加熱を受けたコンクリートの強度推定に関する基礎的研究

    加藤 優志, 五十嵐 豪, 西脇 智哉

    材料施工   ( 2017 ) page: 673 - 674   2017.7

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  24. 1069 アルカリシリカ反応に伴う膨張ひび割れ機構に関する一考察

    大澤 紀久, 五十嵐 豪, 山田 一夫, 西脇 智哉

    材料施工   ( 2017 ) page: 137 - 138   2017.7

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  25. 1087 ひび割れの生じた繊維補強コンクリートの繊維種類による曲げクリープ挙動の違い

    高桑 謙吾, 西脇 智哉, 五十嵐 豪

    材料施工   ( 2017 ) page: 173 - 174   2017.7

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  26. 1285 非破壊検査を用いた低強度コンクリートのスクリーニング手法に関する基礎的検討

    西脇 智哉, 宮部 裕太郎, 五十嵐 豪

    材料施工   ( 2017 ) page: 569 - 570   2017.7

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  27. 1006 合成エトリンガイトと合成モノサルフェートの水蒸気吸脱着性状に関する一考察

    赤羽根 駿之介, 五十嵐 豪, 西脇 智哉

    材料施工   ( 2017 ) page: 11 - 12   2017.7

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  28. Anti-spalling performance of fiber-reinforced concrete with fine PP fiber

      ( 80 ) page: 133 - 136   2017.6

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  29. Fundamental Investigation on Expansion Mechanism Derived from Alkali-Silica Reaction

      ( 80 ) page: 99 - 102   2017.6

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  30. Flexural Creep Behavior of Fiber Reinforced Concrete with Crack State

      ( 80 ) page: 129 - 132   2017.6

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  31. FUNDAMENTAL STUDY ON THE MECHANISM OF EXPANSION GENERATION BY ALKALI-SILICA GEL FROM ALKALI-SILICA REACTION

    OSAWA Norihisa, IGARASHI Go, YAMADA Kazuo, NISHIWAKI Tomoya

    Cement Science and Concrete Technology   Vol. 71 ( 1 ) page: 272 - 279   2017

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    <p>Although it is apparent that the deterioration due to alkali silica reaction is caused by the expansion produced by alkali-silica gel generated by the reaction between alkali and some reactive silicious minerals in alkali-reactive aggregate, there is still controversial for the mechanism of alkali-silica gel staying in the reactive aggregate and producing the expansion pressure and cracks in the concrete. Therefore, this paper tried to identify the mechanism of expansion pressure through some simplified element test using highly reactive andesite, which focuses on alkali-silica gel leaching / staying in the reactive aggregate. A series of experiments, the fluorescent observation of the alkali-silica gel distribution appeared on the cut surface of the reactive aggregate, which immersed into some kind of alkali solutions, hardened gypsum pastes or hardened cement pastes and the crack distribution in the cut surface of the cement paste matrix was carried out. As a result, the alkali-silica gel leached out and did not stay in the reactive aggregate without dense hardened cement paste matrix around. Furthermore, the alkali-silica gel in the dense hardened cement paste seems leach gradually from the reactive aggregate into hardened cement paste matrix without any visible cracking and this trend should be accelerated in case of high temperature or high water to binder ratio.</p>

    DOI: 10.14250/cement.71.272

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  32. 高温履歴を受けたセメントペースト硬化体のヤング係数に関する基礎的実験

    加藤 優志, 五十嵐 豪, 西脇 智哉

    材料施工   ( 2016 ) page: 517 - 518   2016.8

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  33. 曲げ載荷による複数微細ひび割れが生じたUHP-FRCCの短期曲げクリープ性状

    大瀧 浩人, Kwon Sukmin, 五十嵐 豪, 西脇 智哉

    材料施工   ( 2016 ) page: 453 - 454   2016.8

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  34. 超高強度高靭性繊維補強セメント系複合材料の補強繊維種類が収縮特性に及ぼす影響に関する基礎的研究

    高桑 謙吾, 西脇 智哉, Kwon Sukmin, 五十嵐 豪

    材料施工   ( 2016 ) page: 43 - 44   2016.8

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  35. 合成エトリンガイトの水蒸気吸脱着性状と体積変化の関係に関する一考察

    赤羽根 駿之介, 五十嵐 豪, 西脇 智哉, 丸山 一平

    材料施工   ( 2016 ) page: 137 - 138   2016.8

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  36. アルカリラッピングを施した促進反応試験後のASRゲルの画像分析による定量に関する基礎的実験

    五十嵐 豪, 山田 一夫

    材料施工   ( 2016 ) page: 345 - 346   2016.8

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  37. セメントをフライアッシュにより大量置換させたUHP-FRCCの力学特性

    鈴木 慶汰, Kwon Sukmin, 西脇 智哉, 五十嵐 豪, 三橋 博三

    材料施工   ( 2016 ) page: 449 - 450   2016.8

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  38. ナイロン66繊維を用いた繊維補強セメント系複合材料の引張性能および自己治癒性能に関する基礎的研究

    大坂 祐樹, 五十嵐 豪, 西脇 智哉

    材料施工   ( 2016 ) page: 451 - 452   2016.8

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  39. A study on volume change behavior of synthesized ettringite by water vapor adsorption and desorption

      ( 79 ) page: 135 - 138   2016.6

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  40. Effect of high temperature on mechanical properties of hardened cement paste

      ( 79 ) page: 139 - 142   2016.6

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  41. Fundamental study on self-healing capability of FRCC with Nylon66 fiber

      ( 79 ) page: 109 - 112   2016.6

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  42. Effects of using High Volume Fly Ash on Mechanical Properties of Ultra High Performance-Fiber Reinforced Cementitious Composites

      ( 79 ) page: 105 - 108   2016.6

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  43. 合成エトリンガイトの体積変化メカニズムに関する基礎的研究 Reviewed

    五十嵐 豪, 丸山 一平

    コンクリート工学年次論文集   Vol. 38(1)   page: 579 - 584   2016

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  44. 1265 Study on frost resistance and self-healing performance of FRCC using PVA fiber

    SASAKI Haruka, IGARASHI Go, NISHIWAKI Tomoya, TERADA Kengo

    Summaries of technical papers of annual meeting   Vol. 2015 ( 2015 ) page: 529 - 530   2015.9

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  45. 1249 Effects of Fiber on Scaling and Density of Ultra Lightweight Insulation Concrete

    KATO Yushi, IGARASHI Go, KWON Sukmin, NISHIWAKI Tomoya

    Summaries of technical papers of annual meeting   Vol. 2015 ( 2015 ) page: 497 - 498   2015.9

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  46. 1264 Self-Healing Capability of FRCC at the Long-term material age

    OTAKI Hiroto, IGARASHI Go, NISHIWAKI Tomoya

    Summaries of technical papers of annual meeting   Vol. 2015 ( 2015 ) page: 527 - 528   2015.9

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  47. 1021 Some explanation about water adsorption behavior of tobermorite based on modified BET theory

    IGARASHI Go, HASHIMOTO Daichi, MARUYAMA Ippei

    Summaries of technical papers of annual meeting   ( 2015 ) page: 40 - 41   2015.9

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  48. 1021 Some explanation about water adsorption behavior of tobermorite based on modified BET theory

    IGARASHI Go, HASHIMOTO Daichi, MARUYAMA Ippei

    Summaries of technical papers of annual meeting   Vol. 2015 ( 2015 ) page: 40 - 41   2015.9

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  49. Discussion about the behavior of the layer structure of C-S-H based on modified BET theory

    IGARASHI Go, MARUYAMA Ippei

      ( 78 ) page: 157 - 160   2015.6

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  50. Evaluation of Coefficient of Fiber Orientation and its Effects on Tensile Performance of UHP-FRCC

    SUZUKI Keita, KWON Sukmin, NISHIWAKI Tomoya, TAKEDA Mitsuhiro, IGARASHI Go

      ( 78 ) page: 133 - 136   2015.6

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  51. Effects of admixtures on freeze-thaw resistance and self-healing capability of FRCC using PVA fibers

    OTAKI Hiroto, SASAKI Haruka, IGARASHI Go, NISHIWAKI Tomoya

      ( 78 ) page: 117 - 120   2015.6

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  52. Effects air entrained agent and fiber on Freeze-Thaw Resistance of Ultra Lightweight Insulation Concrete

    KATO Yushi, KWON Sukmin, IGARASHI Go, NISHIWAKI Tomoya

      ( 78 ) page: 121 - 124   2015.6

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  53. 21582 Properties change of concrete under irradiated condition : Part 11: Effect of heating and drying; Young's modulus

    IGARASHI Go

    Summaries of technical papers of annual meeting   ( 2014 ) page: 1163 - 1164   2014.9

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  54. 21580 Properties change of concrete under irradiated condition : Part 9: Effect of heating and drying; Drying process of samples

    SASANO Hiroshi

    Summaries of technical papers of annual meeting   ( 2014 ) page: 1159 - 1160   2014.9

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  55. 21582 Properties change of concrete under irradiated condition : Part 11: Effect of heating and drying; Young's modulus

    IGARASHI Go

    Summaries of technical papers of annual meeting   Vol. 2014 ( 2014 ) page: 1163 - 1164   2014.9

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  56. 21580 Properties change of concrete under irradiated condition : Part 9: Effect of heating and drying; Drying process of samples

    SASANO Hiroshi

    Summaries of technical papers of annual meeting   Vol. 2014 ( 2014 ) page: 1159 - 1160   2014.9

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  57. 21578 Properties change of concrete under irradiated condition : Part 7: Effect of heating and drying; Aggregate properties

    ITO Mitsuki

    Summaries of technical papers of annual meeting   Vol. 2014 ( 2014 ) page: 1155 - 1156   2014.9

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  58. 21578 Properties change of concrete under irradiated condition : Part 7: Effect of heating and drying; Aggregate properties

    ITO Mitsuki

    Summaries of technical papers of annual meeting   ( 2014 ) page: 1155 - 1156   2014.9

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  59. Characterization of water adsorption behavior on C-S-H interlayer of hardened cement pastes by modified BET theory

    IGARASHI Go, MARUYAMA Ippei

      ( 77 ) page: 131 - 134   2014.6

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  60. A fundamental study on relation between salt degradation and conditions of location

    HASHIMOTO Daichi, MARUYAMA Ippei, IGARASHI Go, HAMASAKI Hitoshi, AOKI Takayoshi

      ( 52 ) page: 1 - 4   2014.2

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  61. Microstructural and bulk property changes in hardened cement paste during the first drying process Reviewed

    五十嵐 豪

    Cement and Concrete Research   Vol. 58   page: 20 - 34   2014

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  62. 21657 Properties change of concrete under irradiated condition : Part 4 Process of concrete mixture design for neutron-ray and gamma-ray irradiation test

    IGARASHI Go

    Summaries of technical papers of annual meeting   ( 2013 ) page: 1313 - 1314   2013.8

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  63. 21657 Properties change of concrete under irradiated condition : Part 4 Process of concrete mixture design for neutron-ray and gamma-ray irradiation test

    IGARASHI Go

    Summaries of technical papers of annual meeting   Vol. 2013 ( 2013 ) page: 1313 - 1314   2013.8

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  64. 1123 Basic study on measurement method of hardening process of cement paste

    SUGIE Ai, IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of annual meeting   ( 2013 ) page: 245 - 246   2013.8

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  65. 1045 Experimental study on changes of pore structure of drying cement paste by low temperature DSC

    NISHIOKA Yukiko, IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of annual meeting   Vol. 2013 ( 2013 ) page: 89 - 90   2013.8

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  66. 1045 Experimental study on changes of pore structure of drying cement paste by low temperature DSC

    NISHIOKA Yukiko, IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of annual meeting   ( 2013 ) page: 89 - 90   2013.8

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  67. 1123 Basic study on measurement method of hardening process of cement paste

    SUGIE Ai, IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of annual meeting   Vol. 2013 ( 2013 ) page: 245 - 246   2013.8

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  68. スイスでの留学生活

    五十嵐 豪

    コンクリート工学 = Concrete journal   Vol. 51 ( 3 ) page: 291 - 292   2013.3

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    DOI: 10.3151/coj.51.291

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  69. 111 Basic study on measurement method of transition process from fluid phase to solid phase of cement paste

    SUGIE Ai, IGARASHI Go, MARUYAMA Ippei

      ( 51 ) page: 41 - 44   2013.2

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  70. 110 Hydration evaluation of ultra high strength cement paste by XRD/Rietveld analysis

    JEON Baeho, IGARASHI Go, MARUYAMA Ippei

      ( 51 ) page: 37 - 40   2013.2

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  71. 110 Hydration evaluation of ultra high strength cement paste by XRD/Rietveld analysis

    JEON Baeho, IGARASI Go, MARUYAMA Ippei

      ( 51 ) page: 37 - 40   2013.2

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  72. 111 Basic study on measurement method of transition process from fluid phase to solid phase of cement paste

    SUGIE Ai, IGARASHI Go, MARUYAMA Ippei

      ( 51 ) page: 41 - 44   2013.2

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  73. けい酸カルシウム板の中性化と留付け強度低下に関する研究 Reviewed

    五十嵐 豪

    日本建築学会構造系論文集   Vol. 78(掲載確定)   2013

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  74. CARBONATION AND FASTENING STRENGTH DETERIORATION OF CALCIUM SILICATE BOARD

    MARUYAMA Ippei, IGARASHI Go, NISHIOKA Yukiko, TANIGAWA Yasuo

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 78 ( 689 ) page: 1203 - 1208   2013

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    Aging of calcium silicate board is discussed in the present contribution. Recently, the fall of sealing which is composed of calcium silicate board has been reported at times. The mechanism of aging phenomena of calcium silicate board is not wholly understood. For this reason, the chemical analysis and physical property experiment on the aged and newly provided material are conducted and comparison of those results is made. It is experimentally confirmed that tobermorite in calcium silicate board can be carbonated and resultantly it causes decreasing of density, increasing of water vapor BET surface area and water penetration rate, and decrease in strength. The weight of calcium silicate board per strength can be dropped as it is about 12.5% of original value. It is expected that relatively high water content enhances carbonation rate because carbon dioxides dissolves in it and makes carbonic acid. Therefore, it is strongly recommended that calcium silicate board is only used in the drying condition.

    DOI: 10.3130/aijs.78.1203

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  75. 124 Evaluation of autogenous shrinkage process of ultra high strength cement paste based on the hydration pressure theory

    SASANO Hiroshi, TERAMOTO Atsushi, IGARASHI Go, MARUYAMA Ippei, TANIMURA Makoto, MITANI Yuji

      ( 50 ) page: 93 - 96   2012.2

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  76. 120 Development of statistical thickness of adsorbed vapor layer of various hardened cement paste

    IGARASHI Go, TERAMOTO Atsushi, MARUYAMA Ippei

      ( 50 ) page: 77 - 80   2012.2

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  77. 120 Development of statistical thickness of adsorbed vapor layer of various hardened cement paste

    IGARASHI Go, TERAMOTO Atsushi, MARUYAMA Ippei

      ( 50 ) page: 77 - 80   2012.2

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  78. 121 Temperature dependency of virgin isothermal desorption and BET surface area of hardened cement paste

    IGARASHI Go, MARUYAMA Ippei

      ( 50 ) page: 81 - 84   2012.2

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  79. 121 Temperature dependency of virgin isothermal desorption and BET surface area of hardened cement paste

    IGARASHI Go, MARUYAMA Ippei

      ( 50 ) page: 81 - 84   2012.2

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  80. 122 Modeling of concrete carbonation based on water transfer and process of carbonation

    NISHIOKA Yukiko, IGARASHI Go, MARUYAMA Ippei

      ( 50 ) page: 85 - 88   2012.2

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  81. 122 Modeling of concrete carbonation based on water transfer and process of carbonation

    NISHIOKA Yukiko, IGARASHI Go, MARUYAMA Ippei

      ( 50 ) page: 85 - 88   2012.2

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  82. 124 Evaluation of autogenous shrinkage process of ultra high strength cement paste based on the hydration pressure theory

    SASANO Hiroshi, TERAMOTO Atsushi, IGARASHI Go, MARUYAMA Ippei, TANIMURA Makoto, MITANI Yuji

      ( 50 ) page: 93 - 96   2012.2

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  83. MODELLING OF WATER VAPOR ADSORPTION BASED ON SILANOL GROUP REACTION

    IGARASHI Go

      ( 780 ) page: 35 - 39   2012.2

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  84. 水蒸気吸着によるC-S-HのBET比表面積とC-S-Hが有する反応基との相関に関する基礎的考察 Reviewed

    五十嵐 豪, 丸山 一平

    セメント・コンクリート論文集   Vol. 65   page: 140 - 145   2012

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  85. 早期脱型を行ったコンクリートにおける中性化進行予測 Reviewed

    五十嵐 豪

    コンクリート工学年次論文集   Vol. 34   page: 658 - 663   2012

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  86. 水和反応過程におけるセメント硬化体の熱伝導率と相組成の関係 Reviewed

    五十嵐 豪

    コンクリート工学年次論文集   Vol. 34   page: 538 - 543   2012

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  87. 「200N/mm2級超高強度コンクリートの強度・自己収縮特性における初期高温履歴の影響メカニズム」に対する討論 Reviewed

    五十嵐 豪

    日本建築学会構造系論文集   Vol. 77   page: 509 - 510   2012

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  88. PREDICTION OF STRENGTH OF CONCRETE IN LONG-LIVED CONCRETE MEMBER

    MARUYAMA Ippei, IGARASHI Go

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 77 ( 673 ) page: 323 - 332   2012

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    Prediction system for compressive concrete strength in aged structural member is proposed. This system is composed of models of rate of hydration, cement paste phase composition, heat production, specific heat, compressive strength, vapor desorption isotherm, coupled heat and moisture transfer. Each model is verified through experimental data. This system is aiming for the structural member which can not be accessed or can not be evaluated by the core sample test. Using non-destructive data or quality control sample's data, this system might illustrate the distribution and development of concrete strength in structural member properly. From the calculation results for a concrete member exposed to high temperature condition, strength development as well as distribution is quite sensitive to the boundary condition, and this concludes that the evaluation of structural member under such special condition needs precise boundary conditions.

    DOI: 10.3130/aijs.77.323

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  89. DISCUSSION ON “MECHANISM OF EARLY HEAT CURING INFLUENCE ON COMPRESSIVE STRENGTH AND AUTOGENOUS SHRINKAGE OF OVER 200 MPA-CLASS ULTRA-HIGH-STRENGTH CONCRETE”

    MARUYAMA Ippei, TERAMOTO Atsushi, IGARASHI Go

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 77 ( 673 ) page: 509 - 510   2012

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    The discusser wants the authors to answer or explain the following points:<br>1) The authors' discussion does not include a result of concrete specimen whose maximum curing temperature is 90°C and autogenous shrinkage attained the same amount as the specimens experienced lower maximum temperature history.<br>2) The proposed theory does not based on the experimental or theoretical results in some parts.<br>3) Several references are not suitable in the context of authors' story.

    DOI: 10.3130/aijs.77.509

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  90. RELATIONSHIP BETWEEN WATER VAPOR BET SPECIFIC SURFACE AREA AND CHEMICALLY BOUND WATER OF VARIOUS PORTLAND CEMENT AND BLAST FURNACE SLAG CEMENT PASTE

    IGARASHI Go, TERAMOTO Atsushi, MARUYAMA Ippei

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 77 ( 682 ) page: 1819 - 1828   2012

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    It is strongly needed to predict and reduce the amount of concrete shrinkage. Prediction of hardened cement paste needs the information of specific surface area, volumetric water, and bulk modulus when it is based on the theory of hydration pressure. For this purpose, it is important to evaluate the water vapor BET surface area and find the way to predict this value. In this study, the specific surface area of various cement paste was determined by water vapor adsorption isotherm and B.E.T theory and chemically bound water of hardened cement of those was determined by thermal gravity analysis. Based on these data, the unique relationship between chemically bound water at the state of 11%RH condition and BET specific surface is found regardless of cement types.

    DOI: 10.3130/aijs.77.1819

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  91. EARLY AGE VOLUME CHANGING OF PORTLAND CEMENT PASTE UNDER HIGH TEMPERATURE HISTORY

    TERAMOTO Atsushi, IGARASHI Go, MARUYAMA Ippei

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 77 ( 672 ) page: 153 - 159   2012

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    In this paper, total strain and time dependent change of thermal expansion coefficient (TEC) under temperature history of cement paste with W/C=0.3,0.4,0.55 whose binder is normal Portland cement, moderate Portland cement and low heat Portland cement were investigated. In all conditions, a rapid reduction of TEC was observed in very early age and TEC showed the local minimum value around 12-18hour. After that, it gradually increased with reduction of moisture content. During that term, low heat cement could reduce this increment of TEC under high temperature history. This time dependent change of TEC could produce shrinkage as thermal strain with temperature dropping. The amount of this thermal strain is relatively large, and in the case of W/C = 0.4, low heat cement shows lower thermal strain.

    DOI: 10.3130/aijs.77.153

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  92. 1312 Effect of temperature on the number of silanol group in calcium silicate hydrate based on thermodynamic model

    IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   Vol. 2011 ( 2011 ) page: 623 - 624   2011.7

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  93. 1312 Effect of temperature on the number of silanol group in calcium silicate hydrate based on thermodynamic model

    IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   ( 2011 ) page: 623 - 624   2011.7

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  94. 120 Relationship between Young's modulus and phase composition of hardened cement paste under each relative humidity

    IGARASHI Go, HORIGUCHI Naoya, MARUYAMA Ippei

      ( 49 ) page: 77 - 80   2011.2

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  95. 116 Aggregate Volume Change in Equilibrium Relative Humidity

    HORIGUCHI Naoya, IGARASHI Go, MARUYAMA Ippei

      ( 49 ) page: 61 - 64   2011.2

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  96. 116 Aggregate Volume Change in Equilibrium Relative Humidity

    HORIGUCHI Naoya, IGARASHI Go, MARUYAMA Ippei

      ( 49 ) page: 61 - 64   2011.2

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  97. 119 Modeling of Water Adsorption of Calcium Silicate Hydrate

    IGARASHI Go, MARUYAMA Ippei

      ( 49 ) page: 73 - 76   2011.2

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  98. 119 Modeling of Water Adsorption of Calcium Silicate Hydrate

    IGARASHI Go, MARUYAMA Ippei

      ( 49 ) page: 73 - 76   2011.2

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  99. 120 Relationship between Young's modulus and phase composition of hardened cement paste under each relative humidity

    IGARASHI Go, HORIGUCHI Naoya, MARUYAMA Ippei

      ( 49 ) page: 77 - 80   2011.2

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  100. 異なる平衡相対湿度条件下でのセメント硬化体のヤング率と相組成の関係 Reviewed

    五十嵐 豪

    日本コンクリート工学年次論文集   Vol. 33   page: 365 - 370   2011

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  101. RELATIONSHIPS BETWEEN MECHANICAL PROPERTIES AND PHASE COMPOSITION OF HARDENED CEMENT PASTE

    IGARASHI Go, MARUYAMA Ippei

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 76 ( 660 ) page: 213 - 222   2011

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    The effect of elevated temperature history due to heat of hydration on physical properties and hydration system in the cement paste were investigated. The elevated temperature in early ages is known to cause stagnation of strength development. Therefore, the degree of hydration of each mineral component as well as hydrates is determined by X-ray/Rietveld analysis and cement paste properties, namely, the degree of hydration of each mineral, the amount of calcium hydroxide, chemically bound water, water content, density of hardened cement paste and mechanical properties were investigated. As a result, compressive strength, young's modulus, and shear modulus of hardened cement paste, regardless of W/C differences, can be evaluated with gel/space ratio of hardened cement paste with a single curve.

    DOI: 10.3130/aijs.76.213

    CiNii Research

  102. HYDRATION OF 3CaO•Al2O3 AND 4CaO•Al2O3•Fe2O3 IN PORTLAND CEMENT

    MARUYAMA Ippei, MATSUSHITA Tetsuro, IGARASHI Go, NOGUCHI Takafumi, HOSOKAWA Yoshifumi, YAMADA Kazuo

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 76 ( 659 ) page: 1 - 8   2011

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    Hydration process of many kinds of cement paste is investigated by powder X-ray diffraction (XRD)/Rietveld analysis. The parameters of the present study are type of cement (Ordinary Portland cement, Low heat cement, and Eco-cement), water to cement ratio (0.50, 0.35), and curing temperature (283, 293, 313K). In this contribution, reaction of aluminate phase (3CaO•Al<sub>2</sub>O<sub>3</sub>) and ferrite phase (4CaO•Al<sub>2</sub>O<sub>3</sub>•Fe<sub>2</sub>O<sub>3</sub>) is focused and evaluated. Experimental results show that the reaction of both aluminate phase and ferrite phase is affected by the temperature and presence of calcite. When system includes calcite, monocarbonate aluminate is mainly produced, rather than ettringite. And in the case of high curing temperature, Al<sub>2</sub>O<sub>3</sub> is reacted as amorphous. Regarding ferrite phase, the reaction degree at the age of 1 year decrease as curing temperature increases, this can be presumed due to dense amorphous phase around cement minerals. Based on these experimental facts, simple hydration model is presented to evaluate development of hydration degree of aluminate phase and ferrite phase.

    DOI: 10.3130/aijs.76.1

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  103. YOUNG'S MODULUS AND POISSON'S RATIO OF HARDENED CEMENT PASTE UNDER DIFFERENT RELATIVE HUMIDITY

    HORIGUCHI Naoya, IGARASHI Go, MARUYAMA Ippei

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 76 ( 660 ) page: 231 - 236   2011

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    Young's modulus, Poisson's ratio, and bulk modulus of hardened cement under controlled different relative humidities were measured by ultrasonic method as well as direct tensile loading test. It was experimentally confirmed that Young's modulus, Poisson's ratio, and bulk modulus of hardened cement paste decreased as decrease in equilibrium relative humidity especially in the range above 40%RH. And in the range below 40%RH, experimental results of direct tensile loading test showed the decrease in Young's modulus and Poisson's ratio while the experimental results of ultrasonic test showed slight increase of Young's modulus and almost constant behavior of Poisson's ratio. For the decrease of Young's modulus and Poisson's ratio can be explained by the reduction of load-bearing water in the hardened cement paste due to drying, and slight increase under 40%RH by ultrasonic test can be explained by the increase of Si-O network of C-S-H due to drying.

    DOI: 10.3130/aijs.76.231

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  104. FUNDAMENTAL STUDY ON WATER TRANSFER IN PORTLAND CEMENT PASTE

    MARUYAMA Ippei, IGARASHI Go, KISHI Naoya

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 76 ( 668 ) page: 1737 - 1744   2011

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    Water transfer behavior in hardened cement paste is evaluated. For evaluation of water transfer, mass loss of specimens over time is measured and Boltzmann's method is applied to measured data. At the same time, desorption isotherm of hardened cement paste is evaluated. Using the diffusion coefficient for nominal water content and desorption isotherm, water conductivity for chemical potential of water in hardened cement paste is derived. Nine hardened cement paste specimens, which have different porosity, are tested and using these data, predicting model of water conductivity is proposed.<br> The proposed model needs the properties of hardened cement, such as, maximum water content at 20°C degree, water vapor BET surface area, and water content for predicting the water conductivity. According to the simulated results, the temperature dependency of water conductivity is obvious. Evaluation of temperature dependency of water conductivity is remained to be future issue.

    DOI: 10.3130/aijs.76.1737

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  105. WATER VAPOR ADSORPTION ISOTHERM MODEL OF PORTLAND CEMENT PASTE

    MARUYAMA Ippei, IGARASHI Go

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 76 ( 664 ) page: 1033 - 1041   2011

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    Adsorption and desorption isotherm model of hardened cement paste under 20 °C is proposed. Adsorption and desorption isotherm of hardened cement paste with different water cement ratio, temperature history, and different degree of hydration were experimentally studied. Based on the experimental data, following characteristics were derived: 1) BET surface are of adsorption process and desorption process has linear relationship, 2) Relationship between statistical thickness of adsorption and relative humidity is identical in the range below 40%RH, 3) t-curve can be derived from the relationship between statistical thickness of adsorption and relative humidity, 4) difference between statistical thickness of adsorption and t-curve has a linear relationship between Kelvin radius, 5) virgin desorption curve value less than 40%RH has similar value of those of desorption curve after drying pre-treatment, 6) virgin desorption curve has a linear relationship with relative humidity. Based on these experimental points, empirical adsorption model is proposed.

    DOI: 10.3130/aijs.76.1033

    CiNii Research

  106. HYDRATION OF PORTLAND CEMENT AND SURFACE AREA OF HARDENED CEMENT PASTE BY WATER VAPOR ADSORPTION MEASUREMENT

    MARUYAMA Ippei, IGARASHI Go

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 76 ( 663 ) page: 865 - 873   2011

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    Relationship between surface area of hardened cement and cement hydration was evaluated. Hydration process was evaluated by powder X-ray diffraction/Rietveld analysis, on the other hand, surface area of hardened cement paste is determined by water vapor adsorption isotherm and BET theory. Based on the experimental data, the surface area of hardened cement paste has strong correlation with the amount of C-S-H in hardened cement. The surface area by vapor adsorption is very sensitive to the sample preparation and therefore, correlation between surface and amount of C-S-H is different when the pre-drying condition is differed.

    DOI: 10.3130/aijs.76.865

    CiNii Research

  107. HYDRATION OF PORTLAND CEMENT AND SURFACE AREA OF HARDENED CEMENT PASTE BY WATER VAPOR ADSORPTION MEASUREMENT

    MARUYAMA Ippei, IGARASHI Go

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 76 ( 663 ) page: 865 - 873   2011

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    Relationship between surface area of hardened cement and cement hydration was evaluated. Hydration process was evaluated by powder X-ray diffraction/Rietveld analysis, on the other hand, surface area of hardened cement paste is determined by water vapor adsorption isotherm and BET theory. Based on the experimental data, the surface area of hardened cement paste has strong correlation with the amount of C-S-H in hardened cement. The surface area by vapor adsorption is very sensitive to the sample preparation and therefore, correlation between surface and amount of C-S-H is different when the pre-drying condition is differed.

    DOI: 10.3130/aijs.76.865

    CiNii Research

  108. WATER VAPOR ADSORPTION ISOTHERM MODEL OF PORTLAND CEMENT PASTE

    MARUYAMA Ippei, IGARASHI Go

    Journal of Structural and Construction Engineering (Transactions of AIJ)   Vol. 76 ( 664 ) page: 1033 - 1041   2011

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    Publisher:Architectural Institute of Japan  

    Adsorption and desorption isotherm model of hardened cement paste under 20 °C is proposed. Adsorption and desorption isotherm of hardened cement paste with different water cement ratio, temperature history, and different degree of hydration were experimentally studied. Based on the experimental data, following characteristics were derived: 1) BET surface are of adsorption process and desorption process has linear relationship, 2) Relationship between statistical thickness of adsorption and relative humidity is identical in the range below 40%RH, 3) t-curve can be derived from the relationship between statistical thickness of adsorption and relative humidity, 4) difference between statistical thickness of adsorption and t-curve has a linear relationship between Kelvin radius, 5) virgin desorption curve value less than 40%RH has similar value of those of desorption curve after drying pre-treatment, 6) virgin desorption curve has a linear relationship with relative humidity. Based on these experimental points, empirical adsorption model is proposed.

    DOI: 10.3130/aijs.76.1033

    CiNii Research

  109. 1664 Physical Properties and Hydration Process in Hardened Cement Paste with Different Curing Temperature

    IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   Vol. 2010 ( 2010 ) page: 1327 - 1328   2010.7

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  110. 1455 Control of volume change rate of concrete by porous aggregate and alkali solution

    MARUYAMA Ippei, HAYANO Hiroyuki, TERAMOTO Atsushi, IGARASHI Go

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   ( 2010 ) page: 909 - 910   2010.7

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  111. 1455 Control of volume change rate of concrete by porous aggregate and alkali solution

    MARUYAMA Ippei, HAYANO Hiroyuki, TERAMOTO Atsushi, IGARASHI Go

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   ( 2010 ) page: 909 - 910   2010.7

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  112. 1664 Physical Properties and Hydration Process in Hardened Cement Paste with Different Curing Temperature

    IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   ( 2010 ) page: 1327 - 1328   2010.7

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  113. 116 Time Dependant of Poisson's ratio of Cement Paste in Very Early Age

    IGARASHI Go, MARUYAMA Ippei, TERAMOTO Atsushi, HORIGUCHI Naoya

      ( 48 ) page: 61 - 64   2010.2

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  114. 110 Effect of Aggregate Volume and Aggregate Size on Autogenous Shrinkage in Ultra High-Strength Concrete

    TERAMOTO Atsushi, MARUYAMA Ippei, IGARASHI Go

      ( 48 ) page: 37 - 40   2010.2

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  115. 110 Effect of Aggregate Volume and Aggregate Size on Autogenous Shrinkage in Ultra High-Strength Concrete

    TERAMOTO Atsushi, MARUYAMA Ippei, IGARASHI Go

      ( 48 ) page: 37 - 40   2010.2

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  116. 115 The Measuring Method of Poisson's ratio of Cement Paste in Very Early Age

    IGARASHI Go, MARUYAMA Ippei, TERAMOTO Atsushi, HORIGUCHI Naoya

      ( 48 ) page: 57 - 60   2010.2

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  117. 115 The Measuring Method of Poisson's ratio of Cement Paste in Very Early Age

    IGARASHI Go, MARUYAMA Ippei, TERAMOTO Atsushi, HORIGUCHI Naoya

      ( 48 ) page: 57 - 60   2010.2

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  118. 116 Time Dependant of Poisson's ratio of Cement Paste in Very Early Age

    IGARASHI Go, MARUYAMA Ippei, TERAMOTO Atsushi, HORIGUCHI Naoya

      ( 48 ) page: 61 - 64   2010.2

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  119. 普通ポルトランドセメントを用いたセメント硬化体中の反応と物性に及ぼす温度履歴の影響に関する検討(優秀卒業論文賞推薦理由,2009年日本建築学会優秀卒業論文賞 日本建築学会優秀修士論文賞)

    五十嵐 豪

    建築雑誌   Vol. 124 ( 1593 ) page: 104 - 104   2009.8

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  120. 1394 The Effect of Curing Temperature on Hydration of Aluminate in Various Hardened Cement Paste

    IGARASHI Go, MARUYAMA Ippei, MATSUSHITA Tetsuro, NOGUCHI Takafumi

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   Vol. 2009 ( 2009 ) page: 787 - 788   2009.7

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  121. 1125 Experimental investigation for moisture transport of hardened cement paste

    KISHI Naoya, IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   ( 2009 ) page: 249 - 250   2009.7

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  122. 1125 Experimental investigation for moisture transport of hardened cement paste

    KISHI Naoya, IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   Vol. 2009 ( 2009 ) page: 249 - 250   2009.7

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  123. 1260 Fundamental study on hydration reaction of blast furnace slag cement with early temperature history

    TAKAMATSU Nobuyuki, IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   ( 2009 ) page: 519 - 520   2009.7

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  124. 1260 Fundamental study on hydration reaction of blast furnace slag cement with early temperature history

    TAKAMATSU Nobuyuki, IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   Vol. 2009 ( 2009 ) page: 519 - 520   2009.7

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  125. 1394 The Effect of Curing Temperature on Hydration of Aluminate in Various Hardened Cement Paste

    IGARASHI Go, MARUYAMA Ippei, MATSUSHITA Tetsuro, NOGUCHI Takafumi

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction   ( 2009 ) page: 787 - 788   2009.7

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Presentations 23

  1. Pirot Study on Thermal, Physico-Chemical, and Mechanical Behaviour of Concrete to understand the failure behavior of Fukushima Daiichi Nuclear Power Plant Reactor Pressure Vessel Pedestals Project overview

    2024.9 

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    Event date: 2024.9

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  2. Drying shrinkage of FA cement paste under the first drying

    Ippei Maruyama, Miki Segawa, Ryo Kurihara, Aili Abudushalamu, Go Igarashi

    CONCREEP12  2024.6 

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    Event date: 2024.6

    Language:English  

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  3. 21539 原子力施設の新しいASR対策の考え方の提案 その4 新しいASR診断フローとその対策

    五十嵐 豪, 江藤 淳二, 渋谷 和俊, 小川 彰一, 寺本 篤史, 丸山 一平, 山田 一夫

    構造II  2018.7.20  日本建築学会

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    Event date: 2018.7

    Language:Japanese  

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  4. 1312 Effect of temperature on the number of silanol group in calcium silicate hydrate based on thermodynamic model

    IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2011.7.20  Architectural Institute of Japan

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    Event date: 2011.7

    Language:Japanese  

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  5. 119 Modeling of Water Adsorption of Calcium Silicate Hydrate

    IGARASHI Go, MARUYAMA Ippei

    2011.2.19  Architectural Institute of Japan

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    Event date: 2011.2

    Language:Japanese  

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  6. 120 Relationship between Young's modulus and phase composition of hardened cement paste under each relative humidity

    IGARASHI Go, HORIGUCHI Naoya, MARUYAMA Ippei

    2011.2.19  Architectural Institute of Japan

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    Event date: 2011.2

    Language:Japanese  

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  7. 1664 Physical Properties and Hydration Process in Hardened Cement Paste with Different Curing Temperature

    IGARASHI Go, MARUYAMA Ippei

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010.7.20  Architectural Institute of Japan

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    Event date: 2010.7

    Language:Japanese  

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  8. 115 The Measuring Method of Poisson's ratio of Cement Paste in Very Early Age

    IGARASHI Go, MARUYAMA Ippei, TERAMOTO Atsushi, HORIGUCHI Naoya

    2010.2.20  Architectural Institute of Japan

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    Event date: 2010.2

    Language:Japanese  

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  9. 116 Time Dependant of Poisson's ratio of Cement Paste in Very Early Age

    IGARASHI Go, MARUYAMA Ippei, TERAMOTO Atsushi, HORIGUCHI Naoya

    2010.2.20  Architectural Institute of Japan

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    Event date: 2010.2

    Language:Japanese  

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  10. 1394 The Effect of Curing Temperature on Hydration of Aluminate in Various Hardened Cement Paste

    IGARASHI Go, MARUYAMA Ippei, MATSUSHITA Tetsuro, NOGUCHI Takafumi

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009.7.20  Architectural Institute of Japan

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    Language:Japanese  

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  11. 放射線照射環境下にあるコンクリートの物性変化に関する研究 -その11 熱によるコンクリートの物性変化: ヤング率の変化-

    日本建築学会大会学術講演会  2014.9.12 

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  12. 拡張BET理論によるC-S-Hの層間への水蒸気吸着に関する一考察

    日本建築学会東北支部研究報告会  2014.6.21 

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  13. 拡張BET理論によるCa/Si比の異なる合成C-S-Hの水蒸気吸着性状の分析

    コンクリート工学年次大会  2015.7.14 

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  14. 拡張BET理論に基づくセメントペーストの水蒸気吸着モデルの構築

    コンクリート工学年次大会  2014.7.9 

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  15. 拡張BET理論に基づくセメントペーストの水蒸気吸着性状の分析

    セメント技術大会  2014.5.13 

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  16. 拡張BET理論に基づく高Ca/Si比の合成C-S-Hの層間の挙動に関する一考察

    日本建築学会東北支部研究報告会  2015.6.20 

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  17. 拡張BET理論に基づく高Ca/Si比の合成C-S-Hの水蒸気吸着性状に関する一考察

    セメント技術大会  2015.5.12 

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  18. 拡張BET理論を用いたセメントペーストの水蒸気吸着性状の評価手法の提案

    土木学会全国大会年次学術講演会  2014.9.10 

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  19. 拡張BET理論を用いたトバモライトの水蒸気吸着挙動に関する一考察

    日本建築学会大会学術講演会  2015.9.4 

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  20. アルカリラッピングを施した促進反応試験後のASRゲルの画像分析による定量に関する基礎的実験

    日本建築学会大会学術講演会  2016.8.24 

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  21. ゲルフルオレッセンス法によるASRゲルの観察条件に関する一考察

    コンクリート工学年次大会  2016.7.6 

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  22. IMAGE ANALYSIS OF ALKALI-AGGREGATE GEL IN CONCRETE PRISM TEST WITH ALKALI-WRAPPING International conference

    International Conference on Alkali-Aggregate Reaction  2016.7.4 

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  23. A trial of image analysis to quantify the amount of alkali-silica gel formed in concrete prism test with alkali-wrapping

    セメント技術大会  2016.5.10 

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KAKENHI (Grants-in-Aid for Scientific Research) 19

  1. A challenge to observe the swelling behaviour of concrete and unsaturated soil

    Grant number:24K21645  2024.6 - 2026.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Exploratory)

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    Authorship:Principal investigator 

    Grant amount:\6500000 ( Direct Cost: \5000000 、 Indirect Cost:\1500000 )

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  2. Acceleration oxidation experiment on geomaterials using ozone and the multi-physics analysis for the oxidation response

    Grant number:23K17771  2023.6 - 2026.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Exploratory)

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    Authorship:Coinvestigator(s) 

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  3. Mechanism of formation of C-A-S-H microstructure system and optimization of Ca-use for cementitious material binder

    Grant number:23H00203  2023.4 - 2027.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Authorship:Coinvestigator(s) 

  4. 乾湿に伴うコンクリート中の低結晶性水和物の結晶構造の変化の解明

    Grant number:22H01637  2022.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    五十嵐 豪, 高橋 佑弥, 京川 裕之

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\17550000 ( Direct Cost: \13500000 、 Indirect Cost:\4050000 )

    セメント・コンクリートを構成するカルシウム(アルミノ)シリケート水和物(C-(A)-S-H)と類似の結晶性状をもつと考えられるアルカリシリカゲルや,膨潤性粘土鉱物などのもつ特性の共通点,相違点を整理する。膨潤―収縮性状をもつ微晶質水和物の乾湿に伴う結晶構造の変化とマクロな変形挙動を結びつける数理モデルを構築し,鉄筋コンクリート構造物の新規建設における設計への実装による長寿命化や,既存の高経年化した鉄筋コンクリート構造物の評価への適用による供用期間の推定手法を提案することを目指す。

  5. Elucidation fo the mechanism of progressive deformation of tunnel and cut slope in swelling ground due to the wetting-drying cycle and the quality change of ground water

    Grant number:22H01584  2022.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s)  Grant type:Competitive

  6. 乾湿に伴うコンクリート中の低結晶性水和物の結晶構造の変化の解明

    Grant number:23K22907  2022.4 - 2025.3

    科学研究費助成事業  基盤研究(B)

    五十嵐 豪, 高橋 佑弥, 京川 裕之, 高橋 佑弥, 京川 裕之

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    Authorship:Principal investigator 

    Grant amount:\17550000 ( Direct Cost: \13500000 、 Indirect Cost:\4050000 )

    本研究では,セメント・コンクリートを構成するセメントペースト中の主要な成分である微晶質であるカルシウム(アルミノ)シリケート水和物(C-(A)-S-H)のもつ結晶構造の膨潤挙動とコンクリートのマクロな変形挙動の関係を科学的見地から解明することに取り組む。このとき,類似の結晶構造をもつと考えられる膨潤性粘土鉱物に着目し,それぞれのもつ特性の共通点,相違点を整理する。そこから得られた知見から,膨潤―収縮性状をもつ微晶質水和物の乾湿に伴う結晶構造の変化とマクロな変形挙動を結びつける数理モデルを構築することを目指す。

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  7. Elucidation fo the mechanism of progressive deformation of tunnel and cut slope in swelling ground due to the wetting-drying cycle and the quality change of ground water

    Grant number:23K22854  2022.4 - 2025.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s) 

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  8. A challenge for the establishment of the evaluation method of the penetration of minor harmful ions in concrete by using radio isotopes

    Grant number:19K21998  2019.6 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Challenging Research (Exploratory)  Challenging Research (Exploratory)

    Yamada Kazuo

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    A separating quantification method for Cs and Sr simultaneous penetration of 10 μM in mortar based on the autoradiograph using imaging plate (IP) for radioisotopes (RI) has been developed. The separation was realized by using the energy difference between the beta-rays of Cs-137 and Sr-90. From the difference of the degree of attenuation when the samples were exposed under the shielded condition by aluminum plate of 0.1 mm were applied. For quantification, cement pastes containing RI whose concentration is known were fabricated separately as standards and those are exposed on IP simultaneously with mortar samples for evaluation and the signals from samples and standards were compared.

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  9. Challenge of developing a geopolymer with low carbon dioxide emission and absorption properties

    Grant number:19K22003  2019.6 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Challenging Research (Exploratory)  Challenging Research (Exploratory)

    IGARASHI Go

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\6500000 ( Direct Cost: \5000000 、 Indirect Cost:\1500000 )

    As budding research for the development of geopolymer production and curing processes focusing on the reduction of carbon dioxide emissions, we have mainly worked on the elucidation of the reaction mechanism and performance expression mechanism of geopolymers made from magnesium silicate and obtained material and physical properties that can be used for the development of high-performance geopolymers suitable for solidification treatment. We obtained the physical properties of the geopolymer. From the results of reactivity test of lightly burnt magnesium oxide, flow test of fresh paste, compression test, thermogravimetric analysis, and powder X-ray diffraction analysis, it was confirmed that the compressive strength and Young's modulus increased with the progress of material age regardless of the mixing ratio of lightly burnt magnesium oxide and silica fume. The increase in compressive strength and Young's modulus was attributed to the formation of magnesium hydroxide and M-S-H phase.

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  10. Proposal of simple evaluation methods and retrofitting materials for low strength concrete in developing countries

    Grant number:17K18915  2017.6 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Challenging Research (Exploratory)  Challenging Research (Exploratory)

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    A screening method for low strength concrete of existing RC structures for developing countries has been proposed. Moreover, the ferro-cement method of reinforcing an unreinforced brick wall using wire mesh and mortar has been proposed. Based on the results of laboratory experiments and field surveys, screening procedures using various rebound hammer, a scratching device, and a combination of these devices can provide conservative results. Regarding a simple reinforcement method, some elemental and structural tests were performed. It has been confirmed that the proposed ferro-cement method improves seismic capacity.

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  11. Development of high performance geopolymer with additional metal oxide

    Grant number:17K18913  2017.6 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Challenging Research (Exploratory)  Challenging Research (Exploratory)

    Igarashi Go

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\6500000 ( Direct Cost: \5000000 、 Indirect Cost:\1500000 )

    The effects of the amount of zinc oxide on the properties of based ground fine blast furnace slag based geopolymer has been investigated. As a result, the fresh flowability increases, the final setting time becomes longer and the autogenous shrinkage decreases, as the amount of zinc oxide increases up to 5.0 mass%. On the other hand, compressive strength, Young's modulus and carbonation resistance decreases, when zinc oxide was added. Furthermore, the addition of zinc oxide rarely affects on the initial setting time, the development of moisture content and total pore volume, and resistance to salt penetration.

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  12. Proposal of rational material design methods and comprehensive evaluation methods for high performance and functional FRCC

    Grant number:17H03337  2017.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Nishiwaki Tomoya

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    In this project, a database of fiber-reinforced cementitious composite (FRCC) and comprehensive evaluation indices are developed for the design of high functionality and high performance FRCC, by conducting experiments on various kinds of reinforcing fibers in the order of centimeters to nanometers. In order to make it possible to design mix proportions using such a wide range of reinforcing fiber combinations, comprehensive indices were developed to evaluate multiple indicators (e.g., strain hardening, self-healing effect, workability, cost, etc.) that were set as targets.

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  13. Relationship between structural change and volume change of C-S-H during drying process

    Grant number:16H06105  2016.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)  Grant-in-Aid for Young Scientists (A)

    Igarashi Go

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\24570000 ( Direct Cost: \18900000 、 Indirect Cost:\5670000 )

    The first desorption isotherms (relationship between humidity and water content) of the cement paste, which cured under water at various temperatures were obtained and they were analysed based on the adsorption theory, which is called the extended BET theory. As a result, assuming that the void shape of the cement paste is a slit, the slit width is only 6 layers of water molecules. Furthermore, the saturation degree in the slit void is almost the same at high humidity regardless of temperature, but it is lower as the temperature decrease at low humidity.

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  14. Investigation of ASR acceleration test with alkali wrapping and its application for expansion prediction

    Grant number:16H04389  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    The purpose of this study is to demonstrate a prediction method for deleterious expansion of concrete caused by alkali-silica reaction (ASR). To identify the parameters related to the expansion model, accelerated expansion tests, AW-CPTs (Alkali-wrapping Concrete Prism Tests), were conducted. In this method, test specimens were wrapped by wet non-woven paper containing the alkaline solution equivalent to the alkalinity of pore solution in concrete. These parameters were introduced to a chemical and kinetic model for expansion prediction. The results by the numerical simulation were compared with the expansion measured by the concrete specimens exposed to the natural environment for 5 years. The model turned out to demonstrate a remarkable agreement with the experiment when environmental conditions such as precipitation and temperature were well defined.

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  15. Durability mechanics of concrete structure based on nano-atomic scale alteration of C-S-H

    Grant number:15H04077  2015.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Structural performance of reinforced concrete member is dramatically changed due to drying. Concrete compressive strength, tensile strength, and Young's modulus are changed due to drying, and those material performance changes as well as shrinkage-induced cracks alter the structural performance of reinforced concrete member. To understand, predict, and control this phenomena, the understanding of nano-structural changes in hardened cement paste is crucial, and we found the dynamic microstructure change of hardened cement paste through small angle X-ray scattering and water vapor sorption isotherm. Concrete properties change is governed by inhomogeneous volume change between aggregate and cement paste and in this behavior, the interfacial transition zone has a significant role. The reinforced concrete walls with/without drying were investigated and it was found that drying has large influences on stiffness and deformation at the strength.

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  16. Challenge to reduce drying shrinkage of concrete aggregate focused on clay minerals in rock

    Grant number:15K14061  2015.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    Igarashi Go

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    It should be recommended to evaluate whether a rock is better suited for as a concrete aggregate from the view point of petrography in order to calculate/ control the volume shrinkage and expansion of concrete and the cracks due to the volume changes. In this study, it is focused on that calculate/ control of volume change of concrete mainly based on the mechanism of drying shrinkage due to the shrinkage/ swelling of layered structure of clay minerals in rocks. As a result, it is suggested that there are three kind of hydrophile adsorbed sites in tobermorite analyzed with modified BET theory.

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  17. C-S-Hの層状構造変化に基づくコンクリートの乾燥収縮メカニズムへのアプローチ

    Grant number:26889008  2014.8 - 2015.3

    日本学術振興会  科学研究費助成事業 研究活動スタート支援  研究活動スタート支援

    五十嵐 豪

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\1430000 ( Direct Cost: \1100000 、 Indirect Cost:\330000 )

    コンクリートの諸性質を解明するために,多くの研究者によってセメントペーストや合成C-S-Hの微細構造を同定する実験やモデル化の検討がされてきた。特に,コンクリートの乾燥収縮性状は,C-S-Hと水との相互作用により大きな影響を受けるため,セメントペーストや合成C-S-Hの水蒸気吸着等温線の測定およびその分析による微細構造のモデル化が行われている。今年度は,長期乾燥を受けたセメントペーストおよび異なるCa/Si比をもつ合成C-S-Hの水蒸気吸着性状の分析を行った。
    セメントペーストの長期乾燥における水蒸気吸着性状の変化を取得することを目的として,飽水から11%RHまでの湿度環境で6ヵ月間調湿を行ったセメントペーストの水蒸気吸着等温線を取得し,拡張BET理論を用いて吸着等温線全域におけるセメントペーストの水蒸気吸着性状を分析した。その結果,セメントペーストの水蒸気吸着等温線は,湿度環境に関わらず,IV型の吸着パターン,ヒステリシス,低圧ヒステリシス,脱着過程の40%RHの特異点を持ち,水蒸気吸着等温試験中に吸着サイト量,親水性,最大吸着層が変化する傾向が確認された。
    セメントペースト中のC-S-Hとの比較を目的として,Ca/Si=1.50~2.24までのC-S-Hの水蒸気吸着等温線を取得し,拡張BET理論を用いて吸着等温線全域における合成C-S-Hの水蒸気吸着性状を分析した。その結果,合成C-S-Hの水蒸気吸着等温線は,Ca/Siモル比に関わらず,セメントペーストと同様に,IV型の吸着パターン,ヒステリシス,低圧ヒステリシス,脱着過程の40%RHの特異点を持ち,水蒸気吸着等温試験中に吸着サイト量,親水性,最大吸着層が変化する傾向が確認された。

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  18. Development of self-healing UHP-FRCC for maintenance-free RC structures and its application

    Grant number:26289186  2014.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    In this study, the self-healing UHP-FRCC (Ultra-High Performance Fiber Reinforced Cementitious Composite) was developed and investigated to enhance the service life of RC structures without maintenance works even under severe conditions. Application of the UHP-FRCC for structural members of RC structures was also explored. As a result, it was confirmed that UHP-FRCC with PVA fibers could enhance the capability of self-healing without degradation of its mechanical performances. We used the UHP-FRCC as the surface panels of the RC members, and it was confirmed that the mechanical performance of the members with the UHP-FRCC panels could be obtained by the numerical analysis and experimental approach. In particular, UHP-FRCC with high volume fly ash showed the effect of reducing environmental impact. From these results, we can obtain the basic knowledge for the realization of maintenance-free RC structures.

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  19. 高温環境下におけるコンクリートの物性変化に着目した原子力発電所の耐久性予測

    Grant number:11J10116  2011 - 2013

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    五十嵐 豪

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    Grant type:Competitive

    セメントペーストやコンクリートの性質は, 乾燥によって変化することが知られており, その解明にはカルシウムシリケート水和物(C-S-H)の分子構造とナノスケールの凝集構造におけるコロイド的性質の両者を理解する必要がある。このとき, C-S-Hは, 微晶質かつ分析に伴う前処理乾燥によって容易に変質を生じることから粉末X線回折分析や電子顕微鏡観察などにより定量的評価を行うことが困難である。本検討では, セメントペーストの水蒸気吸着等温線を分析することにより, 間接的に外部環境による長期的な乾燥などに伴う変質を評価する手法の確立を目的とした。
    これまでにB㎜auer et al.によって提唱された多分子層吸着理論(以下, BET理論)は, ある吸着等温線をなす材料の比表面積を求めるために有効な手法であるが, 一般的に吸着等温線の相対圧0.05~0.40の領域のみしか評価, 再現できないことが知られており, これを修正された理論がいくつか提案されている。本検討では, BET理論について, 相対する二面から生じる水蒸気―固体表面間にはたらくポテンシャル場の重ねあわせを考慮することにより, 相対圧全域にわたる物理吸着性状の評価を可能とする理論への拡張を行い, 吸脱着プロセス中に生じるセメントペーストの水蒸気吸着性状の変化を評価することを試みた。
    上述のスリット状細孔に適用可能な修正BET理論を用い, 吸着サイト数, 吸着熱, および, 制限空間について分析した結果, 吸着等温線測定中にカルシウムシリケート水和物の層間は, 14Å, 11Å, 9A程度に連続的に3段階に変化すること, 短期間の吸着等温線測定過程では吸着サイト数は大きく変化しないこと, 毛管凝縮は大きくは生じないことなどを明らかにし, カルシウムシリケート水和物の等温吸着モデルを提案した。

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Teaching Experience (On-campus) 1

  1. 建築生産設計工学

    2022

Teaching Experience (Off-campus) 4

  1. 建築生産設計工学

    2022 Nagoya University)

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    Level:Postgraduate 

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  2. Analytical chemistry for cementitious materials characterization

    2020.10 - 2022.9 The University of Tokyo)

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  3. 自然科学総合実験

    2016.4 - 2017.3 Tohoku University)

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  4. 建築材料学演習

    2014.4 - 2019.3 Tohoku University)

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