GFRP/CFRP 混凝土界面剪切性能

Interfacial Shear Performance of Interply HybridGFRP/CFRP Composite and Concrete

摘要:

设计GFRP/CFRP 混凝土搭接双剪试验，研究了界面糙化方式、界面剂种类以及界面形成过程中的压力和温度对GFRP/CFRP层间混杂纤维复合材料混凝土界面剪切性能的影响，并分析了各种因素的影响机理.结果表明：界面化学糙化（酸化）方式可提高界面的机械锚固性能，但降低了固化剂活性，界面剪切强度较物理糙化方式降低29%；15%（质量分数）KH550（硅烷偶联剂）界面剂能显著改善GFRP/CFRP 混凝土界面粘接性能，用其粘接的界面剪切强度较用普通E44环氧树脂界面剂提高66%；GFRP/CFRP 混凝土界面剪切强度随固化压力的增加先增加后减少，005MPa固化压力下界面剪切强度最优；常温范围内（15～45℃），固化温度对GFRP/CFRP 混凝土界面剪切强度影响不大，但当温度低于15℃时界面的剪切性能急剧降低，且升温后界面剪切强度仍较常温固化试件差.

Abstract:

Double shear test was designed to investigate interfacial shear performance of GFRP/CFRP concrete overlap joint specimens, with different interface adhesive, interface treatment, curing pressure and temperatures of epoxy resin, of which the impacts on interfacial shear performance were also analyzed. The test results show that compared with ideal physical roughening, the interface chemical roughening improves the mechanical anchorage performance, but reduces the activity of curing agent, which results in the decrease of interfacial shear strength by 29%. Compared with normal interface adhesive agent of epoxy resin, the silane coupling agent of 15% KH550 solution can be employed to improve the interfacial shear strength between interply hybrid GFRP/CFRP and concrete by 66%. With the increase of curing pressure of epoxy resin, the interfacial shear strength increases at first and then decreases, reaching extremum at about 005MPa curing pressure. At the curing temperature range of 15~45℃, the influence of the curing temperature on the interfacial shear strength is inaparent, but when the curing temperature drops below 15℃, the shear strength decreases sharply, which is irreversible even by increasing temperature.