Prediction of corroded reinforcement profile using longitudinal corrosion crack profile at the reinforced concrete surface

2015 Fiscal Year Final Research Report

• Project/Area Number: 25871031
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering; Civil engineering materials/Construction/Construction management
• Research Institution: Nagaoka National College of Technology
• Principal Investigator: MURAKAMI Yuki 長岡工業高等専門学校, 環境都市工学科, 准教授 (70509166)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 鉄筋腐食 / 腐食ひび割れ幅 / 腐食量 / 腐食膨張挙動 / コンクリートの拘束圧

Outline of Final Research Achievements

In this study, the relationship between longitudinal corrosion crack width at the concrete surface and amount of corrosion of main reinforcement was investigated by accelerated electrolytic corrosion tests on RC specimens with different shear reinforcement ratio. The confinement stress of concrete and shear reinforcements against corrosion expansion was evaluated by conducting an expansion simulation using a non-explosive demolition agent on RC specimens with different cover depth and compressive strength.
As a result, it is important to consider the confinement stress for predicting the amount of corrosion of reinforcement from the corrosion crack width. It seems that the proposed model can be evaluated the diameter of corrosion reinforcement under the confinement stress by setting reasonable elastic modulus of corrosion product and taking into corrosion of shear reinforcements.

Free Research Field

コンクリート工学、維持管理工学