碳纤维布与混凝土正拉黏结性能试验研究  

EXPERIMENTAL INVESTIGATION ON NORMAL TENSILE BONDING PROPERTY BETWEEN CFRP AND CONCRETE

作　　者：祝涛[1] 李杉[1] 李伟捷[1] 梁鸿骏[1] 

机构地区：[1]武汉大学土木建筑工程学院,武汉430072

出　　处：《工业建筑》2016年第3期1-4,共4页Industrial Construction

基　　金：国家自然科学基金资助项目(51108355)

摘　　要：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。For a total of 30 specimens（ 6 groups）,three different epoxy resins were used to paste FRP on dry and wet concrete surface and then cured under ambient temperature（ average temperature 22 ℃,40% ~ 70% humidity）or moisture condition（（ 20 ± 1） ℃,（ 95 ± 3） % humidity）, respectively. Portable pull-out test using the standardized procedure was carried out to quantify the residual strength of carbon fibre reinforced polymer（ CFRP）-concrete bonding. The results showed that： the type of epoxy resins rarely affected the bonding strength at ambient temperature; water on concrete surface had negative impact on the bonding between adhesive and concrete when brushing adhesive; after moisture-curing,the interface between adhesive and concrete was further affected by moisture,the pull-off strength degraded in different degrees,and there was a shift in the failure mode from cohesive failure to adhesive-concrete interface separation or a mixed one. Therefore,resin adhesive strength reduction when using CFRP reinforcement in wet environment must be considered.

关 键 词：碳纤维 混凝土 潮湿养护 黏结强度 

分 类 号：TU528[建筑科学—建筑技术科学]