Proposal of Integrity Evaluation Model for Patched Concrete Considering Thermal Behavior

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K23541
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
• Research Institution: Ritsumeikan University
• Principal Investigator: Kim Yunmi 立命館大学, 総合科学技術研究機構, 専門研究員 (20846662)
• Project Period (FY): 2019-08-30 – 2021-03-31
• Keywords: 断面修復コンクリート / 一体性 / 熱挙動 / 界面

Outline of Final Research Achievements

For the proposal of the integrity evaluation model for patched concrete considering thermal behavior, the thermal behavior experiment and finite element analysis were conducted on patched concrete with different coefficients of thermal expansion of concrete and repair material. The results are as follows: 1) by reducing the difference in the coefficient of thermal expansion between concrete and repair material and reducing the coefficient of static elasticity of the repair material, thermal stress due to the difference in thermal behavior is alleviated; 2) using a repair material with high deformation performance at the repair interface is effective in reducing stress; 3) when the repair material covers concrete, it is necessary to supplement the strength against cracks generated at the edges of the interface.

Free Research Field

建築材料

Academic Significance and Societal Importance of the Research Achievements

コンクリートと補修材の体積変化の不一致により生じる補修したコンクリート部材の早期劣化が問題となっている。本研究で検討するコンクリートと補修材の一体性と応力発生の関係究明は構造物の安全性確保を可能とし，補修後の早期劣化を防止することで構造物のライフサイクルコストが低減できると考えられる。また，断面修復コンクリートのような異種接合材料の健全性評価への適用が期待される。