Updated on 2026/03/10

写真a

 
MATSUZAWA KOICHI
 
Organization
Undergraduate School School of Science and Technology Associate Professor
Title
Associate Professor
External link

Research Interests

  • Building Material

Research Areas

  • Social infrastructure (civil Engineering, architecture,disaster prevention) / Building structures and materials  / Building Material，Concrete，Finishing Material

Education

  • 東京都立大学大学院   工学研究科   建築学専攻

    2002.4 - 2004.3

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  • Tokyo Metropolitan University

    1998.4 - 2002.3

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    Country/Region： Japan

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Research History

  • Meiji University   School of Science and Technology Department of Architecture   Associate Professor

    2024.4

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  • Building Research Institute   Chief Researcher

    2016.4 - 2024.3

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  • Tokyo Metropolitan University   Assistant Professor (non-tenured)

    2008.8 - 2016.3

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  • 東急建設

    2004.4 - 2008.7

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Professional Memberships

Committee Memberships

  • 日本建設あと施工アンカー協会   更新講習委員会／委員  

    2024.11   

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    Committee type：Other

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  • 日本建設あと施工アンカー協会   一般講習委員会／委員  

    2024.7   

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    Committee type：Other

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  • 日本建設あと施工アンカー協会   技術委員会／委員  

    2024.6   

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    Committee type：Other

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  • 日本コンクリート工学会   コンクリート構造物の長期性能シミュレーションソフト普及委員会／委員  

    2024.5 - 2026.3   

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    Committee type：Academic society

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  • セメント協会   JIS原案作成委員会／委員  

    2023.11 - 2024.3   

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    Committee type：Academic society

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  • ALC協会   JIS A 5416 軽量気泡コンクリートパネル改正原案作成委員会／委員  

    2023.7 - 2024.3   

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    Committee type：Academic society

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  • 生コン・残コンソリューション技術研究会   「資源循環ビジネスモデルに資する粒状化再生骨材に関するJIS開発」委員会／委員  

    2023.6 - 2024.3   

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  • 日本コンクリート工学会   構造性能に主眼を置いた鋼材腐食性状の診断・推定手法に関する研究委員会／委員  

    2023.5 - 2025.3   

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    Committee type：Academic society

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  • 日本コンクリート工学会   セメント・コンクリートの環境影響評価に関する研究委員会／委員  

    2023.5 - 2024.9   

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    Committee type：Academic society

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  • せんい強化セメント板協会   JIS A 5430「繊維強化セメント板」改正原案作成委員会／委員  

    2023.5 - 2023.12   

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    Committee type：Academic society

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  • 日本建築学会   JASS5N改定小委員会／性能・品質管理WG／委員  

    2023.4   

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    Committee type：Academic society

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  • セメント協会   ISO/TC74委員会／委員  

    2023.4 - 2024.3   

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    Committee type：Academic society

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  • 日本窯業外装材協会   JIS A 5422 窯業系サイディング原案作成委員会／委員  

    2023.3 - 2023.11   

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    Committee type：Academic society

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  • 日本建設あと施工アンカー協会   登録あと施工アンカー基幹技能者講習委員会／委員  

    2023.1   

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    Committee type：Academic society

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  • 新都市ハウジング協会   コンクリート充填鋼管（CFT）造技術基準・同解説の運用及び計算例等の改訂に係る編集委員会／委員  

    2022.10 - 2024.3   

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    Committee type：Academic society

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  • 日本建築学会   JASS10改定小委員会／委員  

    2022.4   

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    Committee type：Academic society

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  • 日本建築学会   鉄筋コンクリート造建築物の耐久設計研究小委員会／委員  

    2022.4   

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    Committee type：Academic society

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  • 日本建築学会   外装仕上げの劣化とコンクリートの耐久性研究小委員会／幹事  

    2022.4   

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    Committee type：Academic society

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  • 日本コンクリート工学会   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／幹事  

    2022.4 - 2024.9   

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    Committee type：Academic society

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  • 建築保全センター   令和4年版 建築改修工事監理指針改訂委員会 分科会等／委員  

    2021.9 - 2022.8   

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  • 日本建設跡施工アンカー協会   あと施工アンカー告示対応認証委員会  

    2021.8 - 2023.7   

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    Committee type：Other

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  • 日本建築あと施工アンカー協会   あと施工アンカー強度指定申請ガイドライン対応認証委員会／委員  

    2021.8 - 2023.7   

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    Committee type：Academic society

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  • セメント協会   セメント・コンクリート論文編集委員会／委員  

    2021.7 - 2025.6   

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    Committee type：Academic society

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  • 日本建築学会   技術報告集委員会／委員  

    2021.6 - 2023.5   

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    Committee type：Academic society

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  • 日本非破壊検査協会   第7回コンクリート構造物の非破壊検査シンポジウム実行委員会／委員  

    2021.6 - 2022.8   

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    Committee type：Academic society

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  • 日本コンクリート工学会   関東支部／委員  

    2021.5 - 2023.5   

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    Committee type：Academic society

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  • 日本建築学会   鉄筋コンクリート造建築物の環境配慮施工指針改定小委員会／委員  

    2021.4   

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    Committee type：Academic society

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  • 日本建築学会   石炭ガス化スラグ骨材を使用するコンクリートの施工指針作成小委員会／委員  

    2021.4 - 2024.3   

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    Committee type：Academic society

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  • 押出成形セメント板協会   「JIS A 5441 押出成形セメント板」改正委員会／委員  

    2021.1 - 2022.8   

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    Committee type：Academic society

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  • 日本コンクリート工学会   RILEM Week実行委員会／委員  

    2020.12 - 2022.10   

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    Committee type：Academic society

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  • 日本コンクリート工学会   3Dプリンティングによるコンクリート構造物構築に関する研究委員会／委員  

    2020.6 - 2021.12   

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    Committee type：Academic society

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  •   297-DOC Degradation of organic coating materials and its relation to concrete durability／委員  

    2020.4   

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    Committee type：Academic society

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  • 日本建築学会   原子力建築維持管理小委員会／委員  

    2020.4   

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    Committee type：Academic society

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  • 日本建築学会   原子力建築維持管理小委員会・WG／委員  

    2020.4   

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  • 日本コンクリート工学会   実構造物の劣化予測における学術研究の役割とその成果の活用に関する研究委員会／幹事  

    2020.4 - 2022.9   

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  • 日本コンクリート工学会   コンクリートのひび割れ調査，補修・補強指針普及委員会／委員  

    2019.9 - 2026.3   

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    Committee type：Academic society

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  • ベターリビング   PC部材品質審査委員会／高強度部会／委員  

    2019.6 - 2024.3   

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  • 日本コンクリート工学会   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  

    2019.6 - 2021.9   

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    Committee type：Academic society

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  • 日本コンクリート工学会   既設コンクリート構造物の予防保全を目的とした調査・診断・補修に関する研究委員会／委員  

    2019.5 - 2021.3   

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    Committee type：Academic society

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  • 日本コンクリート工学会   新設・既設コンクリート構造物の耐久性照査手法における建築と土木の相違と将来展望に関するFS委員会／幹事  

    2019.4 - 2020.3   

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    Committee type：Academic society

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  • 日本建築センター   既存建築物の耐用年数評価等検討委員会／委員  

    2018.10   

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  • 建築保全センター   平成31年版 建築改修工事監理指針改訂委員会 耐震改修（RC-WG）／委員  

    2018.9 - 2019.8   

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  • 建築性能基準推進協会   建築材料等に関するサンプル調査委員会等 コンクリート系WG／委員  

    2018.7 - 2024.3   

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  • 日本建築仕上学会   ALCパネル現場タイル張り工法指針改訂委員会／委員  

    2018.7 - 2020.3   

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    Committee type：Academic society

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  • 日本コンクリート工学会   3Dプリンティングのコンクリート構造物への適用に関するFS委員会／委員  

    2018.6 - 2019.3   

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    Committee type：Academic society

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  • 日本コンクリート工学会   中性子線を用いたコンクリートの検査・診断に関するFS委員会／委員  

    2018.5 - 2019.3   

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    Committee type：Academic society

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  • 日本コンクリート工学会   コンクリート診断士研修委員会／委員  

    2017.12 - 2023.12   

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    Committee type：Academic society

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  • 日本窯業外装材協会   JIS A 5422 窯業系サイディング改正原案作成委員会／委員  

    2017.12 - 2018.11   

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    Committee type：Academic society

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  • 日本規格協会   「耐震補強引張材－炭素繊維より線に関する標準化」におけるJIS原案作成委員会／委員  

    2017.10 - 2020.3   

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  • RILEM   TC270-CIM Benchmarking Chloride Ingress Models on Real-Case Studies -Marine submerged and Road Sprayed concrete structures／委員  

    2017.10 - 2020.3   

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    Committee type：Academic society

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  • 日本コンクリート工学会   鉄筋コンクリート構造物の複合劣化機構の解明とその対策に関する研究委員会／幹事  

    2017.4 - 2019.9   

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    Committee type：Academic society

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  • 日本コンクリート工学会   コンクリート工学論文集編集員会／委員  

    2017.4 - 2019.3   

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    Committee type：Academic society

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  • 日本非破壊検査協会   第6回コンクリート構造物の非破壊検査シンポジウム実行委員会／委員  

    2017.4 - 2018.8   

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    Committee type：Academic society

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  • 日本コンクリート工学会   コンクリート工学年次論文査読委員会／委員  

    2016.10 - 2018.7   

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    Committee type：Academic society

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  • 日本建築学会   JASS21 ALCパネル工事改定小委員会／JASS21改定原案作成WG／委員  

    2016.4 - 2018.3   

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    Committee type：Academic society

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  • 日本コンクリート工学会   放射性能物質の封じ込めとコンクリート材料の安全利用調査研究委員会／委員  

    2012.4 - 2014.3   

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    Committee type：Academic society

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  • 日本コンクリート工学会   文献調査委員会／委員  

    2010.4 - 2012.3   

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    Committee type：Academic society

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  • 日本建築学会   図書委員会文献抄録第2部会（材料施工）／委員  

    2006.6 - 2011.3   

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    Committee type：Academic society

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Papers

  • Study on the Effects of Cracking and Rainfall on Rebar Corrosion in RC Building Reviewed

    24   2024.10

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  • 接着系あと施工アンカーの塑性域での付着応力度分布と定着性能 Reviewed

    酒井裕基, 千葉翔太, 中野克彦, 松沢晃一

    コンクリート工学年次論文集(CD-ROM)   46   2024.7

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  • 実建築物調査データを用いた中性化後の鉄筋腐食速度評価に関する一考察 Reviewed

    中田清史, 松沢晃一, 鹿毛忠継, 有木克良

    コンクリート工学年次論文集(CD-ROM)   46   2024.7

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  • 乾湿繰返しを受けるモルタル内部の乾湿挙動と内部鋼材の腐食速度 Reviewed

    齊藤亮介, 崎原康平, 松沢晃一, 高谷哲

    コンクリート工学年次論文集(CD-ROM)   46   2024.7

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  • ANCHORAGE PERFORMANCE AND BOND STRESS DISTRIBUTION CONTROL OF ADHESIVE POST-INSTALLED ANCHORS Reviewed

    SAKAI Hiroki, IMAI Kiyoshi, NAKANO Katsuhiko, NUMATA Takuya, ARIKI Katsuyoshi, MATSUZAWA Koichi

    Journal of Structural and Construction Engineering (Transactions of AIJ)   88 ( 814 )   1684 - 1694   2023.12

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    It can be seen that various pre-installed anchors have different stress states and damage states of anchors when the required yield strength is exerted. In order to reproduce this bond characteristic with adhesive post-installed anchors, it is necessary to control the individual bond stress distribution. In this study the adhesion performance is confirmed by performing the installation test, the pull-out test, and the bond test of the long post-installed anchor with the bond stress distribution controlled.

    DOI： 10.3130/aijs.88.1684

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  • ANNUAL FLUCTUATION OF INTERNAL TEMPERATURE AND HUMIDITY OF CONCRETE IN A 46-YEAR-OLD RC BUILDING Reviewed

    NAKADA Kiyofumi, MATSUZAWA Koichi, ARIKI Katsuyoshi, KAGE Tadatsugu

    AIJ Journal of Technology and Design   29 ( 72 )   645 - 650   2023.6

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    To investigate annual fluctuation of internal temperature and humidity of concrete members, we measured and analyzed them in outer wall and balcony slab in a 46-year-old RC building. The results showed that annual average of internal temperature is higher by 1~6 degree C than air temperature mainly because of solar radiation, which leads to decline of water content and average internal humidity. Increase of internal temperature is also responsible for temporary increase of internal humidity. Comparison of the humidity fluctuation at the same range of internal temperature can enable to evaluate fluctuation of water content.

    DOI： 10.3130/aijt.29.645

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  • PULL-OUT PROPERTIES OF POST-INSTALLED ADHESIVE ANCHOR UNDER VARIOUS ENVIRONMENTAL TEMPERATURE Reviewed

    MATSUZAWA Koichi, NAKADA Kiyofumi, KAGE Tadatsugu, KITSUTAKA Yoshinori

    AIJ Journal of Technology and Design   29 ( 72 )   662 - 665   2023.6

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    This paper reports on the influence of environmental temperature on pull-out properties of post-installed adhesive anchor. And the follow conclusions were found. There is relationship between the maximum pull-out load of post-installed adhesive anchor and the compressive strength of concrete at temperatures up to 80°C depends on the adhesive type.

    DOI： 10.3130/aijt.29.662

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  • STUDY ON EVALUATION METHOD OF AGING CONDOMINIUM BUILDINGS PART 2 : EVALUATION FORMULA AND CRITERIA Reviewed

    TSUCHIYA Naoko, MISHIMA Naoki, NAKADA Kiyofumi, MATSUZAWA Koichi, KAGE Tadatsugu, TANANO Hiroyuki, ABE Michihiko

    AIJ Journal of Technology and Design   29 ( 71 )   52 - 57   2023.2

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    For proffer the authorization standard of the act on facilitation reconstruction of deteriorated condominium buildings, studied on evaluation methods and criteria about buildings having the risk of falling cover concrete caused by rebar corrosion. Based on the concept of the binomial test, the number of the deteriorated reinforced concrete elements which highly probable to be the reinforcing bar corrosion higher, is determined by using the data from a survey of the actual buildings. And then, each number of survey points, the criteria for certification was set.

    DOI： 10.3130/aijt.29.52

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  • STUDY ON ENVIRONMENTAL LOAD OF REINFORCED CONCRETE BUILDING USING PHYSICAL SERVICE LIFE AS VARIABLES Reviewed

    MATSUZAWA Koichi, KAGE Tadatsugu, TSUCHIYA Naoko, KOGA Junko, HAMASAKI Hitoshi

    AIJ Journal of Technology and Design   28 ( 70 )   1113 - 1118   2022.10

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    This paper reports on the environmental load for CO<sub>2</sub> emission reduction of RC buildings and RC members made of blended cement using the physical service life as variables. Case studies and parametric studies of the environmental loads were also conducted using physical service life as variables. As a result, it was shown that the impact on the environmental load differs depending on the cement type, finishing material, and maintenance cycle.

    DOI： 10.3130/aijt.28.1113

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  • STUDY ON THE PROCESS OF THE CORROSION- INDUCED CRACK, DELAMINATION AND SPALLING ON RC WALL WITH MORTAR FINISH Reviewed

    TSUCHIYA Naoko, NAKADA Kiyofumi, IKAWA Norihiro, YOKOYAMA Hiroshi, MISHIMA Naoki, MATSUZAWA Koichi, KAGE Tadatsugu, TANANO Hiroyuki

    Journal of Structural and Construction Engineering (Transactions of AIJ)   87 ( 799 )   854 - 865   2022.9

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    For the purpose to study about the characteristics of the process of the corrosion-induced deterioration detected on surface of RC wall with mortar finish, RC wall specimens were electrified and measured the amount of the deteriorations as crack, delamination and spalling by hammer and visual examination periodically. From the results, in the case the cover thickness was small, the delamination increased with the progress of the rebar corrosion, which behavior were not liner but agogics. And in the case the cover thickness was large, the cracks along the rebar increased on mortar surface with the progress of the rebar corrosion.

    DOI： 10.3130/aijs.87.854

    DOI： 10.3323/jcorr.73.32_references_DOI_TwpsMFxftOgX8sNC7wmecE1cvPV

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  • STUDY ON EVALUATION METHOD AND CRITERIA FOR CARBONATION SUPPRESSION EFFECT OF EXTERIOR FINISHING MATERIALS Reviewed

    HAMASAKI Hitoshi, MOTOHASHI Kenji, ETCHUYA Kotaro, NORITAKE Shinya, MATSUZAWA Koichi, TSUCHIYA Naoko

    Journal of Structural and Construction Engineering (Transactions of AIJ)   87 ( 797 )   600 - 609   2022.7

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    In this study, we examined the evaluation method and evaluation criteria for evaluating the carbonation suppression effect of finishing materials used for the exterior of reinforced concrete buildings. We proposed a test method for carbon dioxide transmission rate of finishing materials and clarified the relationship with the carbonation ratio by the accelerated carbonation test while 52 weeks. In addition, based on the carbon dioxide transmission rate after the accelerated weathering test and the value of the carbonation ratio by previous studies, we proposed an evaluation criteria for the carbonation suppression effect in consideration of the deterioration of the finishing material.

    DOI： 10.3130/aijs.87.600

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  • STUDY ON EVALUATION METHOD OF AGING RC CONDOMINIUM BUILDINGS Reviewed

    TSUCHIYA Naoko, MISHIMA Naoki, NAKADA Kiyofumi, MATSUZAWA Koichi, KAGE Tadatsugu, TANANO Hiroyuki, ABE Michihiko, IKAWA Norihiro, YOKOYAMA Hiroshi, HIKOSAKA Nobuyuki

    AIJ Journal of Technology and Design   28 ( 68 )   70 - 75   2022.2

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    For proffer the authorization standard of the act on facilitation reconstruction of deteriorated RC condominium buildings, studied on evaluation methods and criteria about buildings having the risk of falling cover concrete caused by rebar corrosion that exist in a wide. The approach is integrating the deterioration grade of the member of the buildings by visual examination. Through trial and case study used real aging RC condominium buildings, suggested evaluation methods could estimate the grade of rebar corrosion occurred on the exterior of the RC buildings.

    DOI： 10.3130/aijt.28.70

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  • DETERIORATION AND PREVENTIVE EFFECTS OF FINISHING MATERIALS AGAINST CARBONATION AND CORROSION OF REINFORCING BARS IN CONCRETE BASED ON THIRTY YEAR OUTDOOR EXPOSURE TEST USING MODEL BUILDING Reviewed

    MATSUZAWA Koichi, SENBU Osamu, KAGE Tadatsugu, NAKADA Kiyofumi, INOUE Terusato, NEMOTO Kaori

    Journal of Structural and Construction Engineering (Transactions of AIJ)   86 ( 786 )   1126 - 1134   2021.8

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    The durability of Reinforced concrete (RC) buildings are basically determined by the presence or absence of steel corrosion. In order to prevent corrosion of steel in concrete, degradation factors such as carbon dioxide (CO<sub>2</sub>) and chloride ions need to be prevented from penetrating into concrete. In many RC buildings, finishes are applied to concrete surfaces, which prevent the penetration of degradation factors. While many studies have been reported on the preventive effects of finishing materials based on accelerated testing, little is based on the long-term exposure to the outdoor conditions. In this study, a model building made from concrete block specimens whose surfaces were coated with various finishing materials was constructed for the outdoor exposure test. After 30 years of outdoor exposure, the deterioration of finishes and their carbonation and corrosion inhibition effects were investigated.

    The follow conclusions could be drawn based on this study:

    (1) As for the degradation status of finish materials, all finish materials undergo some kind of degradation after a long period of outdoor exposure. In the case of dirt and chalking, rainwater and other influences may improve the judgment of the deterioration status.

    (2) As for the carbonation depth, those with multiple layers of finishes, such as multi-layer type, those with low moisture permeability, such as waterproofing materials, and those with thick finishes are more effective in inhibiting carbonation. On the other hand, those with water repellency or air permeability will accelerate the carbonation.

    (3) Carbonation rate was less than 0.5 for coating materials, such as No.1, 4, 5, 7, 10, 16, 17, 21 and No.22. Because of the large variation, it was not possible to confirm the change in the carbonation protection effect of the finishing materials over time.

    (4) The corrosion depth was smaller in those with multiple layers of finishes, those with low moisture permeability, and those with thick finishes, as well as the carbonation depth.

    (5) The corrosion progress of concrete, containing chlorides, is inhibited by the use of finishing materials that inhibit the penetration of oxygen and moisture.

    (6) The relationship between the corrosion depth and the carbonation depth is that the carbonation progresses first and then the corrosion progresses.

    DOI： 10.3130/aijs.86.1126

    DOI： 10.3130/aijs.88.1622_references_DOI_RafKTKZbdI9Eg2yBAIBXuEfzpgN

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  • コンクリート内湿度の変動メカニズムおよびその分離手法に関する研究 Reviewed

    中田 清史, 松沢 晃一, 鹿毛 忠継

    コンクリート工学年次論文集   43 ( 1 )   449 - 454   2021.7

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  • APPLICABILITY OF VECTOR AUTOREGRESSIVE MODEL TO ESTIMATION OF INTERNAL MOISTURE CONDITION OF CONCRETE EXPOSED TO ORDINARY NATURAL ENVIRONMENT Reviewed

    NAKADA Kiyofumi, MATSUZAWA Koichi, KAGE Tadatsugu

    Journal of Structural and Construction Engineering (Transactions of AIJ)   86 ( 784 )   871 - 880   2021.6

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    To investigate the applicability of VAR-X model to estimating moisture condition of concrete exposed to ordinary natural environment, concrete internal humidity data reported previously were analyzed with weather data from Japan Meteorological Agency. The first 90 days were used for parameter estimation and the second 60 days were used to validate the model and predicted values. The results are summarized below.

    (1) Within the scope of this study, VAR-X model was applicable to the humidity data in the non-rainfall environment. VAR-X model was also able to predict the internal humidity for 60 days based on the estimated parameters and weather data (temperature and humidity), and the RMSE ranged from 0.87 to 2.04%.

    (2) It was judged that the VAR-X model was not appropriate to be applied to the humidity data of rainfall environment. The main reason for this is that the impact of rainfall was underestimated by assuming constant coefficients in the model.

    (3) The mechanisms of humidity fluctuation in concrete are discussed, which include the absorption and release of water and the temperature dependence of concrete water content. Based on the mechanism, difference between rainfall and non-rainfall environment was pointed out and the conditions under which the VAR-X model can be applied are discussed.

    (4) Methods of utilization and improvement of VAR-X model were discussed for cases where the moisture transfer characteristics of concrete changed and where the data increased or decreased in high humidity region. The advantages of time series analysis, including VAR-X model, were also pointed out in comparison with conventional physical models.

    VAR-X model can predict humidity fluctuations in concrete using weather data when certain conditions are met. In

    the future study, the model will be modified and its application to the durability evaluation of various materials will be investigated.

    DOI： 10.3130/aijs.86.871

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  • INFLUENCE OF ENVIRONMENTAL TEMPERATURE ON PULL-OUT PROPERTIES OF POST-INSTALLED MECHANICAL ANCHOR Reviewed

    MATSUZAWA Koichi, KAGE Tadatsugu, KITSUTAKA Yoshinori

    AIJ Journal of Technology and Design   27 ( 65 )   104 - 107   2021.2

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    This paper reports on the influence of environmental temperature on pull-out properties of post-installed mechanical anchor. And the follow conclusions were found. As the environmental temperature rises, maximum load tends to decrease, and the drop of the load becomes approximately linear. There is relationship between the maximum load and the compressive strength under the heated condition less than 100°C.

    DOI： 10.3130/aijt.27.104

    DOI： 10.3130/aijt.29.662_references_DOI_Uz3AUmzK11YCSWBDJHqOnaewf5x

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  • INNOVATIVE MEASUREMENT TECHNIQUE AND EVALUATION METHOD FOR UNFILLED PORTION IN ADHESIVE POST-INSTALLED ANCHOR Reviewed

    ITO Michitane, MUKAI Tomohisa, SUZUKI Hiroshi, NANBU Yoshihito, SUZUKI Junichi, MATSUZAWA Koichi, KINUGASA Hideyuki

    AIJ Journal of Technology and Design   27 ( 65 )   99 - 103   2021.2

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    3D data on unfilled portion in 2 organic adhesive post-installed anchor specimens with intentional unfilled portion is obtained from neutron imaging technology. Image analysis is implemented using above 3D data and length of unfilled portion along re-bar is evaluated quantitatively. After that investigation, length of unfilled portion in some heated adhesive post-installed anchor specimens is predicted using above evaluation method. Finally, those specimens are cut to check the unfilled portion.

    DOI： 10.3130/aijt.27.99

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  • RISK ASSESSMENT OF CONCRETE SPALLING/ FALLING FOR REINFORCED CONCRETE WALLS BASED ON VISUAL INSPECTION Reviewed

    NAKADA Kiyofumi, MATSUZAWA Koichi, TANANO Hiroyuki, KAGE Tadatsugu, TSUCHIYA Naoko, MISHIMA Naoki

    AIJ Journal of Technology and Design   27 ( 65 )   81 - 86   2021.2

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    The aim of this study is to investigate the behaviors of corrosion-induced concrete spalling/falling from fair-faced RC walls and to propose risk assessment methodology for them based on visual inspection. Accelerated corrosion tests show that detectable concrete spalling/falling occurs when cover depth is under 30mm and that rapid increase of concrete spalling/falling follows increase of surface cracking. We propose a framework of criteria for detecting the symptom of the rapid increase, where deterioration degree of inspected walls is divided into 3 stages based on crack index I<sub>c</sub> . The criteria for I<sub>c</sub> is determined by average cover depth of the walls.

    DOI： 10.3130/aijt.27.81

    DOI： 10.3130/aijs.87.1093_references_DOI_5Dg6h5Ze8IgnU6GeLixO7DvsYZL

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  • セメント硬化体の水分移動特性・水分保持特性に与える炭酸化の影響 Reviewed

    中田 清史, 鹿毛 忠継, 松沢 晃一, 兼松 学

    コンクリート工学年次論文集   42 ( 1 )   491 - 496   2020.7

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  • フレッシュコンクリートの2次元流動解析におけるコンクリートポンプの筒先移動の自動化に関する基礎的研 Reviewed

    三島 直生, 鹿毛 忠継, 松沢 晃一

    コンクリート工学年次論文集   42 ( 1 )   1162 - 1167   2020.7

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  • 環境区分ごとのコンクリートの中性化速度予測に関する研究 Reviewed

    井出 朋孝, 濱崎 仁, 尾上 稀一, 松沢 晃一

    コンクリート工学年次論文集   42 ( 1 )   509 - 514   2020.7

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  • 高温にさらされたコンクリートの強度性状に及ぼすセメントおよび混和剤の影響 Reviewed

    嵩 英雄, 田山 隆文, 松沢 晃一, 西 祐宜

    コンクリート工学年次論文集   42 ( 1 )   239 - 244   2020.7

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  • EXPERIMENTAL STUDY ON PROPERTY OF RECLAIMED AGGREGATE FOR CONCRETE AS BUILDING MATERIALS Reviewed

    SUZUKI Sumie, JINNAI Hiroshi, ARAI Masanao, TANANO Hiroyuki, KAGE Tadatsugu, TSUJIMOTO Kazushi, MATSUZAWA Koichi, TSUCHIYA Naoko, MASUDA Yoshihiro

    AIJ Journal of Technology and Design   26 ( 62 )   1 - 6   2020.2

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    In this experimental study, we focus on the Ready-mixed concrete factory using reclaimed aggregate for concrete as building materials. In some Ready-mixed concrete factories, we mixed concrete using reclaimed aggregate, and tested fresh concrete and physical properties. The results show the following points: (1) concrete of using reclaimed aggregate until 20% is same as concrete using original aggregate in testing lab. and site plant (2) a reclaimed coarse aggregate kept for 1 month after collection can use ready-mixed concrete (3) a reclaimed coarse aggregate can be applied to strength class 45 in JIS A 5308.

    DOI： 10.3130/aijt.26.1

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  • THE REALITY SURVEY OF READY-MIXED CONCRETE FACTORY ON RECOVERED AGGREGATE FOR CONCRETE AS BUILDING MATERIALS Reviewed

    SUZUKI Sumie, JINNAI Hiroshi, ARAI Masanao, TANANO Hiroyuki, KAGE Tadatsugu, TSUJIMOTO Kazushi, MATSUZAWA Koichi, TSUCHIYA Naoko, MASUDA Yoshihiro

    AIJ Journal of Technology and Design   25 ( 61 )   1019 - 1024   2019.10

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    In this study, we focus on the Ready-mixed concrete factory using recovered aggregate for concrete as building materials. We interviewed with fourteen Ready-mixed concrete factories, about equipment of collecting recovered aggregate system, products, others and we tested physical properties about aggregate. The results show the following points: (1) 40% of a questionnaire respondent was held equipment of collection recovered aggregate (2) addition method A need to device to put aggregate impartial (3) some physical properties is different between original aggregate and recovered aggregate.

    DOI： 10.3130/aijt.25.1019

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  • 長期高温曝露を受けたコンクリートの破壊エネルギーに関する実験的検討 Reviewed

    松沢 晃一, 嵩 英雄, 田山 隆文, 西 祐宜

    コンクリート工学年次論文集   41 ( 1 )   365 - 370   2018.7

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  • 接着系あと施工アンカーに使用される接着剤の物性評価手法に関する検討 Reviewed

    佐藤 滉起, 濱崎 仁, 秋山 友昭, 松沢 晃一

    コンクリート工学年次論文集   40 ( 1 )   1473 - 1478   2018.7

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  • FUNDAMENTAL STUDY ON PULL-OUT PROPERTIES OF POST-INSTALLED ANCHOR WITH DIFFERENT SPECIMEN SIZES AND TESTING CONDITIONS Reviewed

    MATSUZAWA Koichi, TANUMA Takehiko, TANANO Hiroyuki, KITSUTAKA Yoshinori

    AIJ Journal of Technology and Design   24 ( 57 )   541 - 546   2018.6

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    Study on service of applied conditions and structure performance about members post-installed anchor used are being carried out. This paper reports on the influence of specimen size and testing condition on pull-out properties of post-installed anchor. And the follow conclusions were found: as for the mechanical anchor, pulling behaviors and maximum loads were similar, but these were different for the bonded anchor.

    DOI： 10.3130/aijt.24.541

    DOI： 10.3130/aijt.27.104_references_DOI_8Gu47QdaL8gtaiE5JniYsRezKdk

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  • 加熱を受けたコンクリートのひび割れ抵抗性に関する研究 Reviewed

    山内 博史, 橘高 義典, 国枝 陽一郎, 松沢 晃一

    コンクリート工学年次論文集   39 ( 1 )   283 - 288   2017.7

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  • EVALUATION OF THE INFLUENCE OF ACCELERATED CARBONATION ON THE BOND STRENGTH BETWEEN ALC AND CERAMIC TILES Reviewed

    MIZUTANI Yoshikatsu, KITSUTAKA Yoshinori, MATSUZAWA Koichi, IEDA Yoshiyuki

    AIJ Journal of Technology and Design   22 ( 52 )   863 - 866   2016.10

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    Carbonation of ALC panels progresses simultaneously throughout the whole section. Even with ceramic tiles laid on one side of the panel, ALC is carbonated to the back of the tiles by CO<sub>2</sub> penetration from the other side. In this research, tiled ALC panels were subjected to accelerated carbonation followed by bond strength testing between ALC and tiling. As a result, it was found that carbonation of ALC does not directly cause tile spalling up to a carbonation degree of 89%.

    DOI： 10.3130/aijt.22.863

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  • INFLUENCE OF CARBONATION ON MECHANICAL PROPERTIES OF ALC Reviewed

    MIZUTANI Yoshikatsu, KITSUTAKA Yoshinori, MATSUZAWA Koichi, IEDA Yoshiyuki

    Journal of Structural and Construction Engineering (Transactions of AIJ)   81 ( 728 )   1619 - 1625   2016.10

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    One cause of time-related changes of ALC is the carbonation of tobermorite, the principal mineral of ALC, due to CO<sub>2</sub> in the atmosphere. Tobermorite decomposes into CaCO<sub>3</sub>, SiO<sub>2</sub>, and H<sub>2</sub>O by carbonation, reducing the strength of ALC depending on the CPD. Time-related changes of ALC in the field can be affected by not only carbonation but also other multiple factors including chemical reaction with SOx, NOx, etc., repeated wetting and drying, and repeated freezing and thawing. For this reason, accelerated carbonation was conducted in this study to limit the factor in experimentally investigating the relationship between the CPD and strength changes of ALC.<br> The findings from this study are summarized as follows:<br> (1) Accelerated carbonation of 100 mm-thick ALC at 90% R.H. and 20°C with a CO<sub>2</sub> concentration of 0.3% leads to differences of around 20% between the surface and mid-depth CPDs.<br> (2) The flexural strength and elastic modulus of ALC under accelerated carbonation retain the initial levels up to a CPD of 30% but decrease as the CPD increases thereafter. The declining trends of their residual ratios are linearly related to the CPD.<br> (3) The compressive strength of ALC under accelerated carbonation tends to exceed the initial level at an early stage of carbonation but decreases as the CPD increases after the CPD exceeds 50%. The declining trend of the residual compressive strength ratio is linearly related to the CPD.<br> (4) The flexure specimens of ALC 100 mm in thickness under accelerated carbonation are prone to the effect of internal strain due to the differences in the carbonation shrinkage along their depth.<br> (5) Accelerated carbonation up to a CPD of 30% consists of calcium carbonation by selective extraction of interlayer Ca ions from silicate double-chain structures. Therefore, this does not adversely affect the strength of ALC similarly to carbonation shrinkage.<br> (6) When the CPD exceeds 30%, carbonation shifts to decomposition due to Ca leaching from silicate double chain structures, which is the major cause of losses in the strength of ALC.

    DOI： 10.3130/aijs.81.1619

    DOI： 10.1016/j.conbuildmat.2022.126328_references_DOI_UDmx1Yqbi2FDGBqVjh1fy4NPxH7

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  • EVALUATION OF THE THERMAL PROPERTIES OF ALC SUBJECTED TO ACCELERATED CARBONATION Reviewed

    MIZUTANI Yoshikatsu, KITSUTAKA Yoshinori, MATSUZAWA Koichi, SUGAYA Norio

    AIJ Journal of Technology and Design   22 ( 52 )   857 - 861   2016.10

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    This study deals with the thermal properties of ALC panels subjected to accelerated carbonation. Difference in the thermal conductivity of ALC subjected to accelerated carbonation was marginal, scarcely affecting its heat insulation design values. Also, up to a degree of accelerated carbonation of 70%, the temperatures within ALC panels including steel reinforcement were comparable to those of uncarbonated ALC panels during fire resistance testing. Accelerated carbonation therefore causes no appreciable difference in the heat- and flame-shielding performance of ALC panels evaluated by fire resistance testing.

    DOI： 10.3130/aijt.22.857

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  • INFLUENCE OF COARSE AGGREGATE TYPES ON FRACTURE PROPERTIES OF CONCRETE SUBJECTED TO HIGH TEMPERATURE HEATING Reviewed

    MATSUZAWA Koichi, KITSUTAKA Yoshinori

    Journal of Structural and Construction Engineering (Transactions of AIJ)   81 ( 727 )   1383 - 1390   2016.9

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    It has been reported that strength properties are changed by increasing heat, decreasing to a greater extent as the temperature rises. Since concrete subjected to high temperature heating can suffer strength loss, it can also be prone to cracking. However, there have been few reports on cracking in concrete under the effect of high temperature heating. When investigating the cracking behavior, it is considered important to evaluate not only the crack propagation properties but also crack initiation. Fracture mechanics was therefore employed in this study to investigate the fracture properties related to crack initiation and propagation in concrete. This paper reports on the influence of coarse aggregate types on the fracture properties of concrete subjected to high temperatures up to 800°C.<br> The fracture properties were evaluated based on tension-softening curves, determined by polylinear approximation through inverse analysis of load versus crack mouth opening displacement (CMOD) curves. Specifically, the evaluation was carried out using the initial cohesive stress and fracture energy, the meanings of crack initiation and crack propagation.  Four different types of rock, sandstone, granodiorite, limestone and chert, were used as coarse aggregate. Concrete was proportioned with a water-cement ratio, target slump, and target air content of 57%, 18 cm, and 4.5%, respectively. The coarse aggregate content was kept constant at 356 liters/m<sup>3</sup>, while the slump and air content were adjusted by the admixture dosage. Specimens were demolded 2 days after placing, water-cured at 20°C up to an age of 26 weeks, and then subjected to heating followed by testing.<br> Two programmable muffle furnaces (inside W310 by D610 by H310 mm) with heaters on both side walls were used for heating. The target temperatures in the furnace were 100, 200, 300, 400, 500, 600, 700 and 800°C. Unheated (20°C) specimens were also tested for comparison. The heating rate was 0.5°C/min. After attaining the target, the temperature was kept for 168 h and specimens were allowed to cool naturally to the level of outdoor air temperature.<br> Notched specimens of size of 100 × 100 × 120 mm were used for the wedge-splitting tests. A servo-hydraulic testing machine of closed-loop type was used. The rate of CMOD at the opening mouth was set to 0.02 mm/min.<br> The follow conclusions could be drawn on the basis of this study:<br> (1) The fracture surface areas of both concrete and mortar affected by high temperature heating linearly increase as the temperature rises. The fracture surfaces of concrete tend to be larger than those of mortar.<br> (2) The maximum load of sandstone on the L-CMOD curve scarcely changes up to 300°C, whereas those of other specimens are highest at 100°C. When comparing the maximum loads at the same heating temperatures, that of mortar is higher and that of limestone is lower than the others.<br> (3) The tension softening curves express generally decreasing cohesive stress with the increase in the COD. Amid these trends, the cohesive stress of mortar, whose initial cohesive stress is greater than those of concretes, decreases at a slower rate than those of concretes. As to concrete specimens, the reductions in the cohesive stress of sandstone, granodiorite, and chert take on similar trends, but that of limestone is faster than the other concrete specimens.<br> (4) At a heating temperature of 100°C, the initial cohesive stress of mortar significantly increases, while those of sandstone, granodiorite, and chert slightly increase and that of limestone slightly decreases. At higher temperatures, the initial cohesive stress decrease.<br> (5) Up to a heating temperature of 300°C, the fracture energy of all specimens increases but then tends to decrease as the heating temperature increases.

    DOI： 10.3130/aijs.81.1383

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  • 加熱および中性化による複合劣化作用を受けたコンクリートのひび割れ抵抗性に関する研究 Reviewed

    山内 博史, 橘高 義典, 松沢 晃一, 刈田 祥彦

    コンクリート工学年次論文集   38 ( 1 )   411 - 416   2016.7

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  • コンクリートに埋め込まれたあと施工アンカーの引抜き特性に及ぼす高温加熱の影響 Reviewed

    刈田 祥彦, 松沢 晃一, 橘高 義典, 八木沢 康衛

    コンクリート工学年次論文集   38 ( 1 )   1317 - 1322   2016.7

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  • X線撮影により得られる鉄筋腐食減量とコンクリートの表面ひび割れとの関係について Reviewed

    橘高 義典, 小安 健太, 松沢 晃一, 刈田 祥彦

    コンクリート工学年次論文集   38 ( 1 )   1131 - 1136   2016.7

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  • THE EFFECT OF VARIOUS COATING MATERIALS ON THE SUPPRESSION OF ONGOING CARBONATION IN ALC Reviewed

    MIZUTANI Yoshikatsu, KITSUTAKA Yoshinori, MATSUZAWA Koichi, IEDA Yoshiyuki

    AIJ Journal of Technology and Design   22 ( 51 )   431 - 434   2016.6

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    This paper describes the carbonation suppressive effect of varies coating materials for carbonated ALC. In contrast to carbonation of concrete members, that of ALC simultaneously proceeds within the panel and along the surfaces, as observed in a field survey of aged ALC. Therefore, carbonation-suppressing effect of varies coating materials for carbonated ALC was investigated by evaluation based on the degree of carbonation progression. The research results on the carbonation-suppressing effect of coating materials for concrete were found applicable to carbonated ALC panels.

    DOI： 10.3130/aijt.22.431

    DOI： 10.3130/aijt.22.863_references_DOI_BwxBkPKVLIZuzIb352qHTKRUQnk

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  • A STUDY ON THE EVALUATION OF CARBONATION PROGRESS IN ALC BASED ON CARBONATION-SATURATED CONDITION Reviewed

    MIZUTANI Yoshikatsu, KITSUTAKA Yoshinori, MATSUZAWA Koichi, IEDA Yoshiyuki, MATSUO Noriki

    Journal of Structural and Construction Engineering (Transactions of AIJ)   80 ( 718 )   1833 - 1839   2015.12

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    This research work focuses on an index to the extent of the carbonation progress of ALC based on the carbonation-saturated condition. The progress of carbonation can serve as an index to changes in the strength of ALC panels over time. However, the proportion of calcium carbonate (CaCO<sub>3</sub>) to the total calcium content in ALC at the time of saturation of carbonation reaction varies depending on its production history. Therefore, relative comparison between the degrees of carbonation of different types of ALC is unfeasible solely by comparison of the quantity of CaCO<sub>3</sub> generated by carbonation. In contrast, the level of progress up to saturated carbonation in terms of CO<sub>2</sub> can be used as a parameter for relative comparison. The authors therefore propose the use of the level of carbonation progress for estimating the strength loss. It was also found in this study that the strength of ALC subjected to carbonation in an accelerated environment is retained equal to the initial value up to a level of carbonation progress of around 50% but decreases to 70% with a level of carbonation progress of 100%.

    DOI： 10.3130/aijs.80.1833

    DOI： 10.3130/aijt.22.863_references_DOI_3R6U2Jm6iYw2Yd3O1N6jdsbqh9u

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  • 高強度太径鉄筋の強度性状に及ぼす腐食の影響に関する研究 Reviewed

    内田 祐介, 橘高 義典, 松沢 晃一

    コンクリート工学年次論文集   37 ( 1 )   979 - 984   2015.7

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  • EXAMINATION ON THE INTERNAL STRESS IN ALC PANEL Reviewed

    MATSUZAWA Koichi, KITSUTAKA Yoshinori

    AIJ Journal of Technology and Design   21 ( 48 )   467 - 470   2015.6

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    ALC panels become the building members with necessary strength and durability by the autoclave cure. Autoclave cure of ALC takes approximately 10 h under the temperature of 180℃ and saturated steam pressure of 1MPa. It is thought that strain difference between ALC and reinforcing bar, as a result of temperature change, causes the internal stress in ALC panels. This study was conducted to clarify the existence of the internal stress in ALC panels.

    DOI： 10.3130/aijt.21.467

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  • FIREPROOF PERFORMANCE OF HIGH-DENSITY ALC FLOOR PANEL Reviewed

    MIZUTANI Yoshikatsu, SUGAYA Norio, KITSUTAKA Yoshinori, MATSUZAWA Koichi, SHIRAIWA Masayuki

    AIJ Journal of Technology and Design   21 ( 48 )   667 - 670   2015.6

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    In this study, the fireproof performance of high-density ALC floor panels was investigated. High-density ALC panels designed in accordance with the allowable stress under the design condition of 2,500mm less length, 3,500N/m2 less live load and 100mm more thickness have the fireproof performance which is necessary for Building Standards Act as a floor panel of fireproof construction. The fireproof performance of the floor structure using the high-density ALC panel can be evaluated by the parameters of the maximum load, the maximum length and the lowest thickness obtained by the fireproof test.

    DOI： 10.3130/aijt.21.667

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  • INFLUENCE OF HIGH TEMPERATURE HEATING ON PULL-OUT PROPERTIES OF MECHANICAL ANCHOR EMBEDDED IN CONCRETE Reviewed

    MATSUZAWA Koichi, KITSUTAKA Yoshinori, KATTA Akihiko

    Journal of Structural and Construction Engineering (Transactions of AIJ)   80 ( 707 )   29 - 37   2015.1

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    Surface layer of concrete becomes the most heavily damaged part affected by high temperature heating when concrete structure is subjected to fire accident. In the surface layer of concrete structures, the anchor bolts are used for fixing the equipment or the seismic strengthening elements. This paper reports on the investigation into the influence of high temperature heating up to 1000℃ on pull-out properties of two types of mechanical anchor embedded in concrete. Relationship between the pull-out strength of anchors and the fracture energy was also investigated.

    DOI： 10.3130/aijs.80.29

    DOI： 10.3130/aijt.27.104_references_DOI_7WdnJBpqFQsbBvhBXnOertoCFMu

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    Other Link： https://www.jstage.jst.go.jp/article/aijs/80/707/80_29/_pdf

  • INFLUENCE OF COARSE AGGREGATE ON FRACTURE PROPERTIES OF CONCRETE SUBJECTED TO HIGH TEMPERATURE HEATING Reviewed

    MATSUZAWA Koichi, KITSUTAKA Yoshinori

    Journal of Structural and Construction Engineering (Transactions of AIJ)   80 ( 707 )   1 - 7   2015.1

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    This paper reports on the influence of coarse aggregate on the fracture properties of concrete subjected to high temperatures up to 800℃. The fracture properties were evaluated based on tension-softening curves which were determined by polylinear approximation through inverse analysis of load versus crack mouth opening displacement (CMOD) curves, obtained from wedge-splitting tests using a dedicated analysis program. The follow conclusions were found in this study: The initial cohesive stress of mortar was higher than that of concrete. And the fracture energy of concrete was higher than that of mortar.

    DOI： 10.3130/aijs.80.1

    DOI： 10.3130/aijs.86.1634_references_DOI_4IefC3w0v0l6ODS36G8sqpgkaba

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  • 高温加熱の影響を受けたコンクリートの破壊特性に及ぼす加熱時間の影響 Reviewed

    松沢 晃一, 橘高 義典

    コンクリート工学年次論文集   36 ( 1 )   1318 - 1323   2014.7

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  • コンクリートに埋め込まれた金属系アンカーボルトの高温加熱後の引抜特性に関する研究 Reviewed

    刈田 祥彦, 松沢 晃一, 橘高 義典, 八木沢 康衛

    コンクリート工学年次論文集   36 ( 1 )   1354 - 1359   2014.7

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  • INFLUENCE OF ADHESIVE AND TILE SIZE ON BENDING PROPERTIES OF TILE FINISHING ALC PANEL Reviewed

    MATSUZAWA Koichi, MIZUTANI Yoshikatsu, KITSUTAKA Yoshinori, SHINDO Misato

    Journal of Structural and Construction Engineering (Transactions of AIJ)   79 ( 696 )   209 - 217   2014.2

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    This paper reports on the investigation into the influence of adhesive and tile size on bending properties of tile finishing ALC panels. At first, the influence of adhesive on deformational performance was conducted by the compression and tension test using ALC specimens, finished with various adhesive, of 220 x 100 x 100mm. Then, the bending test was also conducted by using ALC panels, finished with various adhesive and tile, of 2995 x 600 x 100mm.

    DOI： 10.3130/aijs.79.209

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    Other Link： https://www.jstage.jst.go.jp/article/aijs/79/696/79_209/_pdf

  • METHOD OF ESTIMATING THE STRENGTH OF CEMENT PASTE AND MORTAR BASED ON THE HISTOGRAM OF BACKSCATTERED ELECTRON IMAGE Reviewed

    FUNAKOSHI Kie, KITSUTAKA Yoshinori, MATSUZAWA Koichi, HOSOKAWA Yoshifumi

    Journal of Structural and Construction Engineering (Transactions of AIJ)   79 ( 695 )   1 - 7   2014.1

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    To use concrete structures for a long time, it is necessary to know exactly the concrete strength. In this case, it is possible to estimate concrete strength using a small sample. This study investigated the relationship between the compressive strength and the information of backscattered electron image taken with a scanning electron microscope. As a result, We have set the physical quantity from the histogram. After the strength estimation of the cement paste by using it, it was possible to propose the strength estimation formula of mortar by adding the aggregate effects.

    DOI： 10.3130/aijs.79.1

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    Other Link： https://www.jstage.jst.go.jp/article/aijs/79/695/79_1/_pdf

  • INFLUENCE OF AGE AND CURE ON FRACTURE PROPERTIES OF CONCRETE SUBJECTED TO HIGH TEMPERATURE HEATING Reviewed

    MATSUZAWA Koichi, KITSUTAKA Yoshinori

    Journal of Structural and Construction Engineering (Transactions of AIJ)   78 ( 688 )   1027 - 1034   2013.6

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    This paper reports on the investigation into the influence of age and cure on fracture properties of concrete subjected to the effect of high temperature heating up to 800°C. Wedge splitting tests were conducted to measure the load versus crack mouth opening displacement curves. The initial cohesive stress and fracture energy were estimated by the inverse analysis of tension softening diagram calculated by the load versus crack mouth opening displacement curves. As a result, the effect of age and cure on the fracture properties of concrete subjected to high temperature heating was discussed.

    DOI： 10.3130/aijs.78.1027

    DOI： 10.3151/jact.16.210_references_DOI_OQLIrDQKsWs4Ba7vKo9u6G7kBCq

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    Other Link： https://www.jstage.jst.go.jp/article/aijs/78/688/78_1027/_pdf

  • FRACTURE PROPERTIES OF CONCRETE SUBJECTED TO HIGH TEMPERATURE HEATING Reviewed

    MATSUZAWA Koichi, KITSUTAKA Yoshinori

    Journal of Structural and Construction Engineering (Transactions of AIJ)   77 ( 680 )   1477 - 1483   2012.10

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    This paper reports on the investigation into the fracture properties of concrete subjected to the effect of high temperature heating up to 800°C. Wedge splitting tests were conducted to measure the load versus crack mouth opening displacement curves. The initial cohesive stress and fracture energy were estimated by the inverse analysis of tension softening diagram calculated by the load versus crack mouth opening displacement curves. As a result, the effect of high temperature heating on the fracture properties was discussed.

    DOI： 10.3130/aijs.77.1477

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    Other Link： https://www.jstage.jst.go.jp/article/aijs/77/680/77_1477/_pdf

  • セメントペーストの反射電子像の画像解析に基づく強度推定手法に関する検討 Reviewed

    船越 貴惠, 高橋 晴香, 橘高 義典, 松沢 晃一

    コンクリート工学年次論文集   34 ( 1 )   304 - 309   2012.7

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  • 鉄筋を有するコンクリートの中性化によるpHの変化と鉄筋腐食に関する検討 Reviewed

    太田 貴士, 橘高 義典, 松沢 晃一

    コンクリート工学年次論文集   34 ( 1 )   652 - 657   2012.7

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  • タイル仕上げによるコンクリートのせん断ひび割れ抑制効果に関する検討 Reviewed

    石川 直輝, 橘高 義典, 松沢 晃一

    コンクリート工学年次論文集   33 ( 1 )   1667 - 1672   2011.7

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  • 鉄筋コンクリート表面のひび割れ発生時の鉄筋腐食量に関する検討 Reviewed

    橘高 義典, LE PHONG NGUYEN, 塚越 雅幸, 松沢 晃一

    コンクリート工学年次論文集   33 ( 1 )   1145 - 1150   2011.7

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  • 異なる温度養生の影響を受けたモルタルの細孔構造からの強度推定式の検討 Reviewed

    松沢 晃一, 橘高 義典, 塚越 雅幸, 船越 貴恵

    コンクリート工学年次論文集   33 ( 1 )   347 - 352   2011.7

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  • Study on the Architectual finishing of Ancient Roman Concrete Buildings

    Matsuzawa Koichi, Kitsutaka Yoshinori, Kobayashi Katsuhiro, Nakamura Takaya, Yoshimura Manabu

    Summaries of Technical Papers of Annual Meeting Japan Society for Finishings Technology   2010   159 - 162   2010.10

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    Authorship：Lead author   Publisher：Japan Society for Finishings Technology  

    The history of concrete is very old, mortar in ancient Egypt and Greece and concrete were used in ancient Roman times. Concrete used in ancient Roman times is now called "Ancient roman concrete". Formwork is required for the construction of concrete. Timber was used for the mold of ceiling or roof and piled up bricks for wall. Brick mold is the elements that compose concrete structures which used as well as current casting formwork and make the surface appear as a finishing of buildings, seen as a variety of finishing by means of stacking bricks. In this study, the architectural finishing of ancient roman concrete buildings was investigated based on field survey and literature review.

    DOI： 10.14820/finex.2010.0.38.0

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  • Effect of Humidity on Rate of Carbonation of Concrete Exposed to High-Temperature Environment Reviewed

    K. Matsuzawa, Y. Kitsutaka, M. Tsukagoshi

    Proceedings of the International Symposium on the Ageing Management & Maintenance of Nuclear   109 - 114   2010.5

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  • Strength Properties of Mortar Subjected to Triaxial Stress in Hardening Process Reviewed

    K. Matsuzawa, Y. Kitsutaka

    Proceedings of the International Symposium on the Ageing Management & Maintenance of Nuclear   115 - 122   2010.5

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  • EFFECT ON COLOR PROPERTIES OF EXTERNAL WALL FOR VISUAL EVALUATION OF ONE-SIDED CORRIDOR TYPE APARTMENT Reviewed

    OUCHI Kohei, MATSUZAWA Koichi, KITSUTAKA Yoshinori

    AIJ Journal of Technology and Design   16 ( 32 )   49 - 54   2010.2

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    This study was examined in order to clear the effect on color properties of external wall for the visual evaluation of one-sided corridor type apartment from the viewpoint on the value of color area ratio and color combination. The sensory tests were conducted by using the various color simulation panels of one-sided corridor type apartment. The appropriate color area ratio and color combination for improving the visual evaluation of one-sided corridor type apartment was cleared and proposed.

    DOI： 10.3130/aijt.16.49

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    Other Link： https://ndlsearch.ndl.go.jp/books/R000000004-I10586521

  • 加熱および中性化の影響を受けた各種セメント硬化体の諸性状に関する基礎的研究 Reviewed

    渡辺 創一郎, 松沢 晃一, 橘高 義典, 小川 由布子

    コンクリート工学年次論文集   31 ( 1 )   745 - 750   2009.7

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  • 鋼材とセメント系材料の摩擦性状に関する実験的研究 Reviewed

    松沢 晃一, 小澤 潤治, 渡邉 高朗

    コンクリート工学年次論文集   30 ( 3 )   1141 - 1146   2008.6

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    Language：Japanese   Publisher：東京 : 日本コンクリート工学協会  

    コレクション : 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > 学術機関 > 学協会

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    Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10641704

  • A STUDY ON THE TOUGHNESS RECOVERY AND DURABILITY RETENTION OF CRACK REPAIRED VARIOUS CONCRETE SPECIMENS Reviewed

    70 ( 591 )   19 - 24   2005.5

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    A study was made on various concrete specimens concerning their toughness recovery and durability retention. By an evaluation system of tension softening diagram of concrete, we studied the influence of factors of adapting mortar strength, fiber properties, crack-repairing effect and freeze-thaw load on the fracture properties of various concrete specimens. In the case of the crack repaired nonfibrous concrete, it showed a recovery in strength and toughness, but it deteriorated by the freeze-thaw test. On the other hand, in the case of fibrous concretes it showed a sufficient recovery in strength and toughness, and toughness was sustained by the freeze-thaw test.

    DOI： 10.3130/aijs.70.19_1

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    Other Link： https://www.jstage.jst.go.jp/article/aijs/70/591/70_KJ00004392762/_pdf

  • ハイブリッド型短繊維補強コンクリートの破壊特性に及ぼす繊維種類の影響 Reviewed

    松沢 晃一, 橘高 義典, 田村 雅紀

    コンクリート工学年次論文集   26 ( 1 )   333 - 338   2004.6

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    Language：Japanese   Publisher：東京 : 日本コンクリート工学協会  

    コレクション : 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > 学術機関 > 学協会

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    Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10638550

  • ハイブリッド型短繊維を混入したコンクリートの破壊特性 Reviewed

    松沢 晃一, 橘高 義典, 田村 雅紀

    コンクリート工学年次論文集   25 ( 1 )   305 - 310   2003.7

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    Language：Japanese   Publisher：東京 : 日本コンクリート工学協会  

    コレクション : 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > 学術機関 > 学協会

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    Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10637875

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MISC

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Awards

  • 日本建築学会奨励賞

    2015.9   日本建築学会  

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  • コンクリート工学年次大会論文奨励賞

    2014.7   日本コンクリート工学会  

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  • 論文奨励賞

    2013.5   日本建築仕上学会  

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Research Projects

  • Strength development and durability evaluation of concrete using binder that contributes to CO2 reduction

    Grant number：23K04132  2023.4 - 2026.3

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

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    Authorship：Coinvestigator(s) 

    Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

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  • 鉄筋コンクリート造建築物の劣化進行予測に向けた仕上材の劣化度評価方法の確立

    Grant number：22K04405  2022.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    松沢 晃一

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    Authorship：Principal investigator 

    Grant amount：\4160000 （ Direct Cost: \3200000 、 Indirect Cost：\960000 ）

    鉄筋コンクリート建築物の長寿命化には、外部からの劣化因子の透過を抑える必要がある。そのためには、建築物の表面を覆うように施工されている仕上材を適切に評価することが重要であるが、評価方法が定性的（目視）であるために、仕上材の評価と建築物の評価を関連づけられていない。そこで、本研究は仕上材の定量的な評価方法を確立し、その先に、実環境下における仕上材の劣化を含めた鉄筋コンクリート建築物の評価方法の確立を目指す。そこで、本研究では「仕上材の劣化度評価方法」を確立することを目的とし、「1）仕上材の劣化度評価方法の確立（仕上材の評価）」、「2）コンクリートの耐久性に及ぼす仕上材劣化の影響に関する検討（コンクリートの評価)」、「3）実環境下における仕上材の劣化進行に関する検討（建築物の評価）」の3項目に取り組んでいる。2023年度に実施した内容は、以下のとおりである。
    1）仕上材の劣化度評価方法の確立（仕上材の評価）は、既往の研究で行った仕上材の二酸化炭素透過度試験結果を整理した。また、屋外暴露試験に用いる試仕上材験片の作製方法に関する検討を行った。
    2）コンクリートの耐久性に及ぼす仕上材劣化の影響に関する検討（コンクリートの評価)は、コンクリートに4種類の仕上材を施工した供試体を作製し、促進中性化試験および屋外暴露試験を開始した。また、促進試験に関して、試験に用いる紫外線の波長に関する調査を行った。
    3）実環境下における仕上材の劣化進行に関する検討（建築物の評価）は、鉄筋コンクリートに4種類の仕上材を施工した供試体を作製し、電気化学的手法による鉄筋腐食に関する測定の後、雨掛かりの有無で異なる2環境下で屋外暴露試験を開始した。

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  • Influence of Environmental Temperature on Pull-Out Properties of Post-Installed Anchors

    Grant number：18K13876  2018.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    Matsuzawa Koichi

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    Authorship：Principal investigator 

    Grant amount：\4160000 （ Direct Cost: \3200000 、 Indirect Cost：\960000 ）

    In this study, the pull-out resistance of concrete structures with post-installed anchors installed in the surface layer of the member was investigated from the viewpoint of clarifying the pull-out resistance when exposed to a temperature environment of up to about 80°C and downsizing the test method for the temperature environment.
    As a result, the effect of environmental temperature on the pull-out characteristics of post-installed anchors was experimentally clarified. As a result, the effect of environmental temperature on the pull-out characteristics of post-installed anchors was clarified experimentally. In addition, some issues were identified regarding the miniaturization of the creep test.

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  • Pull-out properties of post-installed anchor subjected to high temperature heating

    Grant number：16K21264  2016.4 - 2018.3

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

    Matsuzawa Koichi

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    Authorship：Principal investigator 

    Grant amount：\4160000 （ Direct Cost: \3200000 、 Indirect Cost：\960000 ）

    In this study, the influence of high-temperature heating on the pull-out properties of post-installed anchors was investigated by performing pull-out tests of the anchors from constructed concrete structures heated from room temperature to 800°C.
    In 2017, influence of specimen size and testing condition on pull-out properties of post-installed anchors was investigated.
    And in 2018, the temperature zone of drop of pull-out load occurs was studied in detail concerning each post-installed anchor with specimensize and test condition based on the result in 2017.

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  • Study on mixed mode fracture properties of high-strength fiber-reinforced concrete used as earthquake resisting materials

    Grant number：20560531  2008 - 2010

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

    KITSUTAKA Yoshinori, MATSUZAWA Koichi

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    Authorship：Coinvestigator(s) 

    Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

    Mixed mode fracture behavior of a concrete with fiber reinforced mortar and porcelain tile finishing was investigated and the effectiveness for those finishing materials as a seismic isolation device was cleared. Numerical analysis method to evaluate the 3D crack propagation of a concrete and finishing materials was proposed and a good correlation was found between the analysis results and the test results. Evaluation data on the seismic retrofit performance of finishing was obtained.

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