Reinforcing steel bar can exert its strength and ductility by bonding to concrete. However, corrosion of steel bars reduces the bonding effect. This study mainly investigated the coupling effects of fly ash (FA) and corrosion on bond behavior. The impressed current method was utilized to achieve the target corrosion degrees. Three crucial factors that have impact on bond behavior was considered, which were FA content, corrosion degree and stirrups. The bond behavior was discussed using the bond‐slip curves. The results showed that the slight corrosion (less than 2.1%) can improve the bond behavior, the supplement of 15% FA can result in a higher ultimate bond strength and to a substantial extent offset the reduction in bond strength owing to the severe corrosion of rebar. The effects of stirrups on bond strength mainly focused on fly ash concrete (FAC) and had an almost negligible impact on ordinary concrete. The results and discussions can be of great significance to establish the bond‐slip constitutive model under multi‐factor coupling conditions and also can give some important advices to the design of engineering structures.

中文翻译：

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粉煤灰和腐蚀对钢筋混凝土粘结性能的影响

钢筋可以通过粘结到混凝土上来发挥强度和延展性。但是，钢筋的腐蚀会降低粘结效果。这项研究主要研究粉煤灰（FA）和腐蚀对结合行为的耦合作用。利用外加电流法达到目标腐蚀度。考虑了影响键合行为的三个关键因素，即FA含量，腐蚀程度和箍筋。使用粘结滑移曲线讨论了粘结行为。结果表明，轻微腐蚀（小于2.1％）可以改善粘结性能，添加15％FA可以导致更高的最终粘结强度，并在很大程度上抵消了由于严重腐蚀而造成的粘结强度降低。钢筋。箍筋对粘结强度的影响主要集中在粉煤灰混凝土（FAC）上，而对普通混凝土的影响几乎可以忽略不计。研究结果和讨论对于建立多因素耦合条件下的滑移本构模型具有重要意义，也可以为工程结构设计提供重要建议。