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通过双剪试验,研究了冻融循环和持续荷载共同作用下碳纤维增强复合材料(CFRP)-高强混凝土界面的黏结性能.结果表明:冻融循环和持载作用均对CFRP-高强混凝土的黏结性能产生了不利影响,冻融循环使其极限荷载和极限黏结滑移显著减小,持载则降低了其黏结刚度;冻融循环和持载的共同作用使界面黏结性能退化进一步加剧,而有效黏结长度增加.此外,界面的破坏形式由树脂与混凝土之间的黏结破坏转变为表层混凝土的剪切破坏,说明冻融循环和持载作用引起的混凝土劣化是导致界面黏结性能降低的主要原因.
Through the double-shear test, the bonding behavior of the CFRP-HSC interface under the combined effect of freeze-thaw cycles and continuous load was studied. The results show that both the freeze-thaw cycles and the loading effect on the CFRP-HSC bond performance The freeze-thaw cycle significantly reduces the ultimate load and the ultimate bond slip, and the load-holding reduces the bond stiffness. The combination of freeze-thaw cycles and holding loads further aggravates the degradation of the interfacial adhesion, whereas the effective bond In addition, the interface failure mode changes from the bond failure between resin and concrete to the shear failure of surface concrete, which indicates that the freeze-thaw cycle and the concrete degradation caused by the load-bearing effect are the main reasons for the decrease of the interface bond performance.