Externally bonded (EB) carbon fiber-reinforced polymers (CFRPs) have been progressively considered for application in concrete structures. However, the corrosion of reinforcing steel bars (rebars) in reinforced concrete (RC), which is more common in coastal environments than in inland environments, can degrade structural performance. The bonding performance of FRP-to-concrete joints can be further deteriorated by the degradation of the interfacial bonding behavior between the rebar (or rebars) and concrete cross-sectional area reduction at the steel bar plane induced by rust expansion. In this study, the effect of rebar corrosion on the FRP bonding performance of RC components was experimentally investigated for the first time. Single shear tests assisted by a 3D optical displacement measurement system were used to obtain the full-field distribution of specimen displacements. The test results show that, although the corrosion level and diameter of the steel bar slightly affected the bonding strength of FRP-to-concrete, the corrosion crack width increased as the steel bar corrosion level increased, which affected the failure mode. Hence, as the corrosion level of the steel bars increased, the likelihood of concrete cover separation increased. Finally, a modified strength design model accounting for the rebar corrosion level was proposed in this paper.

中文翻译：

---

腐蚀作用下纤维增强聚合物-混凝土接头的粘结性能

已经逐渐考虑了外部粘结（EB）碳纤维增强聚合物（CFRP）在混凝土结构中的应用。但是，钢筋混凝土（RC）中钢筋的腐蚀（在沿海环境中比在内陆环境中更普遍）会降低结构性能。FRP与混凝土接头的粘结性能可能会由于钢筋之间的界面粘结行为的恶化以及锈蚀膨胀引起的钢筋平面上混凝土横截面面积的减小而进一步恶化。在这项研究中，首次实验研究了钢筋腐蚀对RC组件的FRP粘结性能的影响。使用3D光学位移测量系统辅助的单剪力测试来获得样品位移的全场分布。试验结果表明，尽管钢筋的腐蚀程度和直径对玻璃钢与混凝土的粘结强度有轻微的影响，但随着钢筋腐蚀程度的增加，腐蚀裂纹宽度增加，从而影响了破坏模式。因此，随着钢筋腐蚀程度的增加，混凝土覆盖层分离的可能性也会增加。最后，提出了一种考虑钢筋腐蚀程度的改进强度设计模型。腐蚀裂纹宽度随着钢筋腐蚀程度的增加而增加，影响了破坏模式。因此，随着钢筋腐蚀程度的增加，混凝土覆盖层分离的可能性也会增加。最后，提出了一种考虑钢筋腐蚀程度的改进强度设计模型。腐蚀裂纹宽度随着钢筋腐蚀程度的增加而增加，影响了破坏模式。因此，随着钢筋腐蚀程度的增加，混凝土覆盖层分离的可能性也会增加。最后，提出了一种考虑钢筋腐蚀程度的改进强度设计模型。