Structural performance of RC members subjected to chemical expansion due to DEF

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04650
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22010:Civil engineering material, execution and construction management-related
• Research Institution: Meijo University
• Principal Investigator: Ishikawa Yasuaki 名城大学, 理工学部, 教授 (00257651)
• Co-Investigator(Kenkyū-buntansha): 上田 尚史 関西大学, 環境都市工学部, 准教授 (20422785)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 化学膨張 / DEF / 総エネルギー一定則

Outline of Final Research Achievements

The purpose of this study is to clarify that chemical expansion behavior due to DEF can affect the structural performance of RC beams. RC beam specimen satisfying the DEF conditions are made and their expansion behavior are measured. Subsequently, loading tests on the RC beam are also performed after the measurement of chemical expansion, and it is investigated whether the chemical expansion due to DEF affects the shear load-bearing performance of the RC beam from the viewpoint of experiments and numerical simulations. As a result, it is shown that the chemical expansion attributed to DEF greatly affects the shear behavior of RC beams.

Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

DEFによる損傷を受けたRCはりを作製し，そのRCはりに載荷実験を実施すると同時に，同一環境下でのDEFによる化学膨張エネルギーを測定ことや，載荷時の構造性能に及ぼす影響について明らかにするといった試みは，これまで実施されておらず，本研究の独創的な点である．本研究の目的が達成された場合，化学膨張エネルギーを介して，DEFの生成条件とRC部材の構造性能を結びつけるにあたっての知見を提供することができると考えられる．