Prediction of Corrosion Rate of Steel Rebars in Carbonated Reinforced Concrete Members and Proposal of a Soundness Assessment Method

本文主要研究碳化引起的钢筋混凝土结构的腐蚀问题。1)根据砂浆的电阻率、钢筋的腐蚀电位和锈蚀速率的变化，从电化学和水泥化学的角度阐明了特定环境条件下的防腐机理。2)根据碳化腐蚀控制机理，提出了碳化腐蚀速率预测方法。3)利用钢筋在辅助性胶凝材料中的腐蚀测试结果，验证了碳化腐蚀速率的预测方法。4)提出了一种可行的考虑碳化影响的钢筋混凝土结构健康评估方法。

This study focused on carbonation-induced corrosion in RC structures. The summary of the achievement are:1)Based on the change of electrical resistivity of mortar, corrosion potentials, and corrosion rate of steel rebar, clarified the corrosion controlling mechanisms in the viewpoint of the electrochemical and cement chemistry under specific environmental conditions. 2)Proposed a prediction method of carbonation-induced corrosion rate according to the corrosion controlling mechanisms. 3)Verified the prediction method of carbonation-induced corrosion rate by the measured corrosion results of steel rebar embedded in supplementary cementitious materials. 4) Proposed a feasible soundness assessment of RC structures considering the effect of carbonation.