GFRP/CFRP-混凝土界面剪切性能  

Interfacial Shear Performance of Interply Hybrid GFRP/CFRP Composite and Concrete

作　　者：何小兵[1,2] 严波[1] 申强[3,4] 

机构地区：[1]重庆大学工程力学系,重庆400030 [2]重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地,重庆400074 [3]交通部公路科学研究院 [4]北京新桥科技发展有限公司,北京100001

出　　处：《建筑材料学报》2013年第6期1004-1011,共8页Journal of Building Materials

基　　金：国家重点基础研究发展计划(973计划)项目(2012CB723305);重庆市基础与前沿研究计划项目(cstc2013jcyjA 30011);重庆市自然科学基金资助项目(2008BB6344)

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．Double shear test was designed to investigate interracial shear performance of GFRP/CFRP con- crete overlap joint specimens, with different interface adhesive, interface treatment, curing pressure and temperatures of epoxy resin, of which the impacts on interracial shear performance were also analyzed. The test results show that compared with ideal physical roughening, the interface chemical roughening im proves the mechanical anchorage performance, but reduces the activity of curing agent, which results in the decrease of interracial 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 interracial shear strength between interply hybrid GFRP/CFRP and concrete by 66%. With the increase of curing pressure of epoxy resin, the interracial shear strength increases at first and then decreases, reaching extremum at about 0.05 MPa curing pressure. At the curing temperature range of 15-45 ℃, the influence of the curing temperature on the interracial shear strength is inaparent, but when the curing temperature drops below 15 ℃, the shear strength decreases sharply, which is irreversible even by increasing temperature.

关 键 词：层间混杂复合材料 界面剪切强度 界面剂 固化压力 固化温度 

分 类 号：TU599[建筑科学—建筑技术科学]