Development of a method for evaluating the risk of spalling of concrete cover due to rebar corrosion

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04554
• 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: Kagawa University
• Principal Investigator: Matsushima Manabu 香川大学, 創造工学部, 特命教授 (00130302)
• Co-Investigator(Kenkyū-buntansha): 車谷 麻緒 茨城大学, 理工学研究科(工学野), 准教授 (20552392) ; 岡崎 慎一郎 香川大学, 創造工学部, 准教授 (30510507)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: コンクリート / 鉄筋腐食 / 剥離 / 剥落 / シミュレーション

Outline of Final Research Achievements

The effects of conditions such as the amount of corrosion, cover thickness, and spacing of reinforcing bars on the risk of delamination and spalling were investigated for RC structures subjected to this salt damage. The results obtained are as follows: 1. Electrical corrosion tests were conducted on a large reinforced concrete slab specimen to identify various conditions such as cover, reinforcement conditions, and concrete performance that affect the cracking mode of reinforced concrete members; 2. The regression model for the cracking damage degree with the parameters of environment, materials used, and service life was developed with the help of machine learning model. The regression model was constructed with the aid of a machine learning model.

Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

塩害を受ける鉄筋コンクリート構造物において、鉄筋腐食の程度が、かぶりコンクリートのひび割れ発生や進展性状、剥離や剥落に至るか否かを事前に判別するニーズがある。本成果により、塩害劣化したコンクリートの破壊予測モードに応じた維持管理戦略の立案に貢献することができる。