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Improving accuracy of prediction evaluation method for cracking with volume changes in concrete structures

Research Project

Project/Area Number 18K04312
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22010:Civil engineering material, execution and construction management-related
Research InstitutionHosei University

Principal Investigator

MIZOBUCHI Toshiaki  法政大学, デザイン工学部, 教授 (60339504)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsひび割れ / 設計用値 / 温度応力 / 簡易評価手法 / 若材齢クリープ / 直接引張試験法 / 体積変化 / 温度ひずみ / 自己収縮ひずみ / 熱膨張係数 / 直引張強度 / 温度依存性 / 体積ひずみ / 直接引張試験 / 温度ひび割れ / クリープ特性
Outline of Final Research Achievements

While analysis technology for predicting the occurrence of cracking with volume changes in mass concrete structures has made great strides in the last 30 years, mechanical properties and thermal properties as design values used for analysis have been improved. Regarding various characteristics, it is difficult to say that they have sufficient accuracy as analysis technology. Therefore, in this study, in order to develop the system that can easily acquire and evaluate the design values required for crack prediction analysis in the field, the method for optimizing the characteristic values obtained from the simple physical property evaluation test was developed. Furthermore, the direct tensile strength test method that takes temperature dependence into consideration, the new crack prediction analysis method that introduces the volume strain change rate, and the simple test method for evaluating creep characteristics at a young age were developed.

Academic Significance and Societal Importance of the Research Achievements

本研究は,現場で簡便に熱特性を最適化することができ,温度依存性を考慮した力学特性を把握することができることから,施工予定のコンクリート構造物のひび割れ予測精度を大幅に向上させることが可能になることである。また,これまで分離が難しかった体積変化に伴うひずみ成分を極力統合することで,解析自体の簡易化を図るとともに,予測精度低下の原因の一つであった設計用値の選定を現場で簡便に評価できるシステムの構築を目指したことである。特に,本研究で開発した簡易物性評価試験法は国内の現場のみならず,海外の現場においても用いることができ,現地の材料を用いたひび割れ解析に必要な設計用値を簡便に取得することが可能である。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (6 results)

All 2020 2019 2018

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (1 results)

  • [Journal Article] Study on estimation of creep behaviour of concrete at early age considering temperature effect2019

    • Author(s)
      Kayo Ohashi・Jun-ichi Arai・Toshiaki Mizobuchi
    • Journal Title

      Concrete Solutions2019

      Volume: -

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] STUDY ON VARIOUS FACTORS RELATED TO THE EVALUATION OF THERMAL CRACKING PROBABILITY OF MASS CONCRETE STRUCTURES2019

    • Author(s)
      Ryoichi Ashizawa・ Toshiaki Mizobuchi・Hiroki Izumi
    • Journal Title

      5th International Conference on Sustainable Construction Materials and Technologies

      Volume: -

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] マスコンクリート構造物における温度影響を考慮した引張強度特性 に関する一考察2019

    • Author(s)
      新井 淳一・泉 宙希・芦澤 良一・溝渕 利明
    • Journal Title

      コンクリート工学年次論文集

      Volume: 41 Pages: 329-334

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Study on the influence of minor constituents in blast furnace slag rich cement on the thermal and mechanical properties of concrete2019

    • Author(s)
      Toshiaki Mizobuchi・Kohsuke Ishizeki・Takahiro Sagawa・Tetsushi Kanda
    • Journal Title

      Journal of Advanced Concrete Technology

      Volume: Vol.17 Pages: 46-61

    • NAID

      130007558464

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] 高炉スラグ微粉末を用いたコンクリートの温度影響を考慮した諸特性に関する研究2018

    • Author(s)
      泉宙希,新井淳一,持丸史弘,溝渕利明
    • Journal Title

      セメント・コンクリート論文集

      Volume: 72

    • NAID

      130007626860

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] コンクリートの湿気移動解析に用いる各特性に関する検討2020

    • Author(s)
      溝渕利明,掛来実,中村秀明,長田直之
    • Organizer
      コンクリート工学年次論文集
    • Related Report
      2020 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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