Understanding the deterioration mechanism of concrete structures subjected to local water supply and suggestions for maintenance management

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K14224
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 22010:Civil engineering material, execution and construction management-related
• Research Institution: Kagoshima University
• Principal Investigator: Koike Kentaro 鹿児島大学, 理工学域工学系, 助教 (30781992)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: 水掛かり / 塩害 / 水分移動 / 環境差腐食 / 腐食速度

Outline of Final Research Achievements

In bridges, water is sometimes supplied locally to members due to poor drainage, etc., and concentrated deterioration around water-hanging areas is a problem. In this study, a specimen simulating a water-hanging area was fabricated, and the concrete resistivity was measured using a buried electrode to understand the characteristics of water movement in the concrete. In addition, the effect of water exposure on the internal reinforcing bars was also investigated by using RC beam specimens exposed to a real environment. Through these investigations, we obtained information that contributes to understanding the deterioration mechanism of concrete structures subjected to local water supply and to making suggestions for maintenance and management.

Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

現在，鉄筋コンクリート構造物の維持管理では，内部鋼材に及ぼす水の影響について，耐久性照査へ十分に反映されているとは言えず，耐久性照査に資する情報としての包含的な整理，また鋼材腐食への影響が十分に評価されたとは言えない．
本研究で得られた成果は，水掛かりを受けるコンクリート構造物の劣化機構の理解につながるもので，これらの情報を基に，今後は適切な補修工法の提案，維持管理体系の高度化が期待される．