盐溶液干湿循环对CFRP-混凝土界面粘结性能的影响

为了考察盐溶液干湿循环条件对碳纤维增强复合材料（Carbon fiber reinforced polymer，CFRP）-混凝土界面粘结性能的影响，本文采用5%的NaCl溶液来模拟海水环境，经过不同次数的干湿循环后，利用单面剪切试验对48个试件界面性能的变化情况进行了研究，分析了上述环境对界面破坏形式、界面承载力及界面剪应力等参数的影响。结果表明：在盐溶液干湿循环作用下，界面粘结性能发生显著地退化，具体表现为，随着干湿循环次数的增加，界面承载力会不断降低，且下降程度与混凝土强度和CFRP的粘贴尺寸有关，界面剪应力在不同环境下的分布具有相似性，即荷载的不断增加会使剪应力逐渐由加载端向自由端传递，但在传递过程中，有效传递区域的长度不会发生改变。

Effect of wet and dry cycles in salt solution on the interfacial bonding property of CFRP-concrete

In order to investigate the effects of wet dry cycles in salt solution conditions on the interfacial bonding property of carbon fiber reinforced polymer(CFRP)-concrete, this paper adopted 5% NaCl solution to simulate seawater environment.After different times of wetting drying cycle, the single shear test was used to study the changes of 48 specimens' interfacial properties.The effects of the above mentioned environment condition on the types of interfacial bonding failure, interfacial capacity and interfacial shear stress were analyzed. The test results show that after wet dry cycles in salt solution, the interface bonding property will be significantly degraded.With the increase of cycle times, the interfacial capacity that is related to the strength of concrete and the CFRP size continues to decrease. Although the interfacial shear stress distribution under different environmental conditions all expresses as the transmission from the loading end to the free endas the load increasing, the effective bonding length does not change during the whole transfer process.