为研究界面剂对湿接缝黏结性能的影响，首先通过力学性能试验，确定硅灰水泥净浆界面剂中硅灰的最佳掺量，再通过劈裂抗拉强度试验、三点弯曲试验和抗剪强度试验，探究普通水泥净浆、硅灰最佳掺量下的水泥净浆、环氧树脂作为界面剂时，对湿接缝黏结性能的影响效果。结果表明：硅灰最佳掺量为8%时水泥净浆力学性能最优，从抗拉角度和抗剪角度进行分析，不同界面剂对湿接缝黏结性能的影响，由大到小排序均为：环氧树脂界面剂 >掺8%硅灰水泥净浆界面剂 >普通水泥净浆界面剂 >无界面剂。可见，普通水泥净浆界面剂对湿接缝黏结性能提升较小，而环氧树脂界面剂和掺8%硅灰水泥净浆界面剂对湿接缝黏结性能提升效果较为明显。

In order to study the effect of interfacial agent on the bonding properties of wet joints, the optimal dosage of silica fume in the interfacial agent of silica fume cement paste was determined through mechanical property test. Then, the splitting tensile strength test, three-point bending test and shear strength test were conducted to explore the use of ordinary cement paste, cement paste with optimal dosage of silica fume and epoxy resin as interfacial agent. Effect on bonding properties of wet joints. The results show that the mechanical properties of the cement paste are the best when the optimal content of silica fume is 8%. The effects of different interfacial agents on the bonding properties of wet joints are analyzed from the tensile and shear angles, and the order from the largest to the smallest is: epoxy resin interfacial agent > 8% silica fume cement interfacial agent > ordinary cement interfacial agent > no interfacial agent. It is concluded that the interface agent of ordinary cement paste has little improvement on the bonding property of wet joints, while the interface agent of epoxy resin and 8% silica cement paste has obvious improvement on the bonding property of wet joints.