The evaluation of bond degradation between rebar and concrete due to the impressed cathodic current using interface parameters

In this study, bond degradation between rebar and concrete due to impressed cathodic current is evaluated using four interface parameters. It was foun d that the shear stiffness per unit length, the critical debond shear force per length and the surface energy decreased as the impressed cathodic curr ent density and/or the polarization time increased; however, the remaining shear force ratio, D, did not vary with the cathodic current density and th e polarization time. A parameter, psi, which combined the effects of the cu rrent density and the polarization time, is proposed, and unified regressio n curves between this parameter and interface parameters have been obtained .