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使用三种胶黏剂,分别在干燥的混凝土表面粘贴纤维增强复合材料(FRP)后放入室温环境(平均温度22℃、湿度40%~70%)养护或在潮湿的混凝土表面粘贴FRP后放入潮湿环境((20±1)℃、湿度(95±3)%)养护,对6组共计30个试件做了碳纤维(CFRP)与混凝土的正拉黏结试验。结果表明:室温环境中粘贴FRP并养护后,不同种类的胶黏剂对CFRP与混凝土的黏结强度影响较小;涂刷胶黏剂时,混凝土表面含水会影响胶黏剂的有效黏结;潮湿养护后,胶黏剂层与混凝土的界面受到不利的影响,各种胶对应试件的正拉黏结强度均有不同程度的下降,破坏形式由混凝土内聚破坏多转变为黏附破坏或者混合破坏;由此可知,在潮湿环境下使用CFRP加固时必须考虑树脂胶强度的折减。
Three kinds of adhesives were used to apply the FRP to the dry concrete surface, respectively, and then placed in a room temperature environment (average temperature 22 ℃, humidity 40% ~ 70%) to cure or paste the FRP on the wet concrete surface (20 ± 1) ℃ and humidity (95 ± 3)%). A total of 30 specimens from 6 groups were tested for the positive pull bonding of CFRP with concrete. The results show that different types of adhesives have little effect on the bond strength between CFRP and concrete when the FRP is pasted and cured at room temperature. When the adhesive is applied, the water content on the concrete surface will affect the effective adhesion of the adhesive. , The interface between the adhesive layer and the concrete was adversely affected, and the positive pull-bonding strength of all kinds of glue corresponding to the specimens decreased in varying degrees. The failure mode changed from cohesive failure of concrete to adhesion failure or mixing failure. This shows that in the wet environment, the use of CFRP reinforcement must take into account the reduction of resin strength.