Establishment of concrete work method to prevent degradation due to segregation of concrete for structures

2021 Fiscal Year Final Research Report

• Project/Area Number: 18K04446
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Meijo University
• Principal Investigator: TERANISHI Kohji 名城大学, 理工学部, 教授 (30340293)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Keywords: 材料分離 / 間隙通過性 / 高流動コンクリート / 骨材 / セメントペースト / チクソトロピー / AI / 粗粒率

Outline of Final Research Achievements

Various investigations with a goal of establishing the concrete work method to prevent degradation due to segregation of concrete for structures were conducted. As a result, the effects of raw materials, mix design and casting method of concrete on the filling ability with passing between rebars, the resistance for settling of coarse aggregate, the resistance for segregation of coarse aggregate while passing between rebars were clarified. Moreover it was found out that the filling ability with passing between rebars of high fluidity concrete can be evaluated by PJ of J-ring test. In addition, some admixtures to increase thixotropic property of cement paste were picked out. A machine learning model to estimate the fineness modulus of aggregates was built.

Free Research Field

工学

Academic Significance and Societal Importance of the Research Achievements

コンクリートの材料分離は、これまで、使用するコンクリートのポテンシャルとしての材料性質のみに着目して議論されてきた。それに対し、本研究は、構造体コンクリートにおける材料分離の度合いやそれに伴う品質低下との関連において、合理的に材料分離の抑制方法を検討したところに学術的意義がある。また、材料分離が抑制された高品質な普通コンクリート・高流動コンクリートを製造・施工する手段を提供したところに社会的意義があるといえる。