Modelling bond strength of corroded plain bar reinforcement in concrete

G. Xu, Huazhong University of Science & Technology, China
J. Wei, Huazhong University of Science & Technology, China
T. Tan, Huazhong University of Science & Technology, China
H.Q. Liu, Huazhong University of Science & Technology, China

In this paper, the corrosion influence on bond strength between plain bar and concrete without confinement is studied at the time of cracking and before cracking occurs, and causes of bond strength increment are analysed quantitatively. A new calculation model for corrosion pressure and corrosion depth at the time of cracking is proposed. Considering the change of bar surface and increment of corrosion pressure, a new calculation model for bond strength at the time of cracking and before cracking occurs is given. Additionally, the theoretical model is verified using different test results.