GFRP筋的拉伸性能劣化对其与海水海砂混凝土粘结性能的影响  

Effect of tensile performance degradation of GFRP bars on their bond performance with seawater sea-sand concrete

作　　者：郝志豪 戴建国[2] 王召 陈建飞 HAO Zhihao;DAI Jianguo;WANG Zhao;CHEN Jianfei(Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China;Department of Civil and Environment Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 510075,China)

机构地区：[1]南方科技大学海洋科学与工程系,深圳518055 [2]香港理工大学土木与环境工程学系,中国香港999077 [3]南方海洋科学与工程广东省试验室(广州),广州510075

出　　处：《复合材料学报》2023年第12期6572-6582,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52178218,52150710542);深圳市科创委技术攻关重点项目(重2020N014)。

摘　　要：研究了玻璃纤维增强树脂基复合材料(Glass fiber reinforced polymer,GFRP)筋的拉伸性能劣化对其与海水海砂混凝土(Seawater sea-sand concrete,SSC)粘结性能的影响。采用10 mm直径的GFRP筋,测试了3种不同温度下模拟SSC孔溶液中GFRP筋的拉伸强度随其浸泡时间的变化规律;并通过拉拔试验测试了经上述劣化后GFRP筋和SSC界面的粘结性能,分析了界面的破坏形态、粘结-滑移曲线特征及粘结强度的变化规律。试验结果表明:随着模拟SSC孔溶液中浸泡时间的增加,GFRP筋的拉伸强度逐渐降低。与未经浸泡的GFRP筋相比,在23℃、40℃和60℃下浸泡3个月后的GFRP筋的拉伸强度分别降低25%、29%和48%。GFRP筋的拉伸性能劣化会导致其与SSC界面的粘结强度下降。与未经浸泡的GFRP筋相比,在23℃、40℃和60℃下浸泡3个月后的GFRP筋与SSC的界面强度分别下降了8%、19%和38%。The effect of tensile performance degradation of glass fiber reinforced polymer(GFRP)bars on their bond performance with seawater sea-sand concrete(SSC)was studied.The tensile strength of a series of 10 mm GFRP bars was tested after immersing in simulated SSC pore solution at different temperatures for different durations.The bond performance of these degraded GFRP bars in SSC was conducted using the pull-out test.The failure mode,bond strength and the characteristics of the stress-slip curve were investigated.The test results indicate that the tensile strength of GFRP bars gradually decreases with the SSC pore solution immersion time.Compared with GFRP bars without immersion,the tensile strength of GFRP bars was reduced by 25%,29%and 48%after 3 months of immersion at 23℃,40℃and 60℃,respectively.The bond strength reduces with the increase of the tensile performance degradation of GFRP bars.Compared with GFRP bars without immersion,their bond strength with SSC was reduced by 8%,19%and 38%after 3 months of immersion at 23℃,40℃,and 60℃,respectively.

关 键 词：GFRP筋 海水海砂混凝土 拉伸强度 界面粘结强度 拉拔试验 

分 类 号：TB302[一般工业技术—材料科学与工程] TU528.59[建筑科学—建筑技术科学] TB33