Evaluation method for bond-splitting behavior of reinforced concrete with corrosion based on confinement stress of concrete against corrosion expansion

Abstract

In this study, the bond behavior of corroded reinforced concrete (RC) was investigated by conducting pull-out tests on RC specimens with different corrosion crack widths. The confinement stress of concrete was evaluated by an expansion simulation using a non-explosive demolition agent, from which a confinement stress equation for RC with corrosion cracking was proposed. Bond strength linearly decreased with decreasing confinement stress in the concrete. The rate of decrease was independent of longitudinal corrosion crack width at the concrete surface, cover thickness, and reinforcement diameter. Furthermore, from the relationship between bond strength and confinement stress in concrete, equations for predicting bond stress and slip curve were proposed. Overall, the predicted values agreed well with the experimental results of other studies.