Influence of dry-wet alternation of sulfate on bondingperformance of carbon fiber reinforced epoxy-concrete interface

In order to study the effect of sulfate corrosion on the degradation of interface properties of carbon fiber reinforced epoxy (CF/EP)-concrete. The sulfate environment was simulated by accelerated corrosion tests of cyclic dry-wet alternate. The degradation behavior of CF/EP-concrete interface under sulfite corrosion was studied. The results show that the effect of sulfate dry-wet alternation on the failure form of CF/EP-concrete interface is significant; the bond performance of interface increases slightly with the extending of corrosion time, and then decline accelerated. Based on the experiment and the existing interface theory, an interfacial bond-slip model is proposed, which is related to corrosion time. Through the comparison between the model predictions and the experimental data, the model can well reflect the degradation behavior of interfacial bonding performance under the dry-wet alternation of sulfate.