The Influence of Corrosion Types on the Deterioration of Shear Strength of Corroded RC Beams

摘要

The paper examines the effect of the corrosion types of reinforcing steel on the deterioration of shear strength of corroded reinforce concrete (RC) beams. Three possible types of corrosion, i.e., uniform (or general), pitting (or localized) and hybrid corrosion, for RC beams exposed to de-icing salts or sea environments are considered. From the investigation of the present paper, it can be concluded that the corrosion types have great effect on the time-dependent shear strength of a corroded RC beam. Generally, the shear strength degraded fastest for hybrid corrosion among the three corrosion types. When the corrosion rate is relative small, the deterioration of the shear strength for the uniform corrosion is greater than that for pitting corrosion. However, when the corrosion rate becomes larger, the deterioration of the shear strength for the pitting corrosion is greater than that for uniform corrosion as corrosion propagates.