Establishment of sustainability evaluation technology for repair effects of RC buildings

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H02298
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Hiroshima University
• Principal Investigator: Ohkubo Takaaki 広島大学, 先進理工系科学研究科(工), 教授 (60185220)
• Co-Investigator(Kenkyū-buntansha): 松本 慎也 近畿大学, 工学部, 准教授 (30325154)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 補修効果 / 持続性 / ひび割れ / 剥離 / 漏水

Outline of Final Research Achievements

This research aims to establish a technique to quantitatively evaluate the sustainability of the repair effect for the three repair methods of (1) crack repair, (2) spalling prevention repair, and (3) waterproof repair, which are in high demand for repairing RC buildings. Accumulated leading data. Originally, "sustainability of repair effect" is an important factor in selecting a repair method, but at present, it is not considered even in the maintenance guidelines of public institutions. Concretely, this study has set a clear objective of "proposing an evaluation method for the sustainability of the repair effect of various repair methods, accumulating experimental data, and proposing and verifying a technique for measuring the repair effect on an actual building." and consider. In addition, as a feature of this research, it can be pointed out that a demonstration experiment was carried out on the existing A-bombed RC building "Rikugun Hifuku Shisyou Souko" in Hiroshima City.

Free Research Field

建築材料学

Academic Significance and Societal Importance of the Research Achievements

本研究は「各種補修工法の補修効果の持続性に関する評価方法の提案と実験データ蓄積，および実建築物で補修効果を計測する技術の提案と検証」という明確な目的を設定して検討を行った。この目的を達成するための学術的創造性の一つが，補修後の性能低下を評価して仕様選定にフィードバックする「診断基準」である。「①ひび割れ補修」に関しては透気性状，「②剥落防止補修」に関しては，一面せん断（面内接着）強度，更に被服支廠倉庫などの老朽化した建築物では常時微動で診断基準を提案し，各種実証実験を行った。
一方，本研究の意義として，広島市に現存する被爆RC造建築物「被服支廠倉庫」で実証実験を実施したことが挙げられる。