NaCl溶液侵蚀下混凝土/环氧树脂界面黏结-分离本构试验

摘要

采用楔入劈裂法对混凝土/环氧树脂界面I型断裂力学性能进行试验研究,得到界面的黏结-分离的本构关系,并对硅烷偶联剂是否能在NaCl溶液环境下对混凝土/环氧树脂界面的性能起到改善作用进行验证.研究结果表明:极限黏结强度和断裂能量随浸泡时间的增长而呈指数下降趋势;在I型荷载的作用下,对比组试件的破坏模式为混凝土的拉伸破坏;随着浸泡时间增长,试件的破坏模式逐渐转变为混凝土/环氧树脂界面的剥离;混凝土/环氧树脂界面的黏结性能可通过硅烷偶联剂改善.%The mechanical property of mode I concrete/epoxy interface was studied by wedge split test method, and the traction-separation law was obtained. Whether the silane coupling agent was able to improve the performance of concrete/epoxy interface under NaCl solution was also analyzed. The results show that both the ultimate bond strength and the fracture energy decrease exponentially with soaking duration. Under mode I loading, the failure mode of the control specimen is tensile failure of the concrete. With the increase of soaking duration, the failure mode of the interface specimen was gradually turned into adhesive failure along the concrete/epoxy interface. The performance of the concrete/epoxy interface can be improved by the application of silane coupling agent.