高温处理后氯氧镁水泥粘贴CFRP-混凝土粘结性能研究  

Study on Bond Properties of CFRP−Concrete Bonded with Magnesium Oxychloride Cement after High−Temperature Treatment

作　　者：赵少伟 石可心 郭蓉 王莲香 ZHAO Shaowei;SHI Kexin;GUO Rong;WANG Lianxiang(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;Tianjin Highway Development Service Center,Tianjin 300170,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]天津市公路事业发展服务中心,天津300170

出　　处：《北京理工大学学报》2023年第7期685-692,共8页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(51878238)。

摘　　要：碳纤维增强聚合物(carbon fiber reinforced polymer,CFRP)已经广泛应用于外贴混凝土结构加固工程.氯氧镁水泥(magnesium oxychloride cement,MOC)因具有出色的力学和耐高温性能,被认为是高温工作环境下最有潜力取代有机胶黏剂的CFRP-混凝土界面粘结材料.在研究中,首先针对优化配比后的改性MOC进行XRD物相组成分析,从微观解释高温作用后MOC强度的劣化;然后通过采用MOC胶黏剂的CFRP-混凝土界面的单剪试验,分析高温处理后的界面粘结性能,试验结果显示改性MOC胶黏剂的CFRP-混凝土结构加固效果良好,在经过高温损伤后仍具有一定强度.最后针对MOC作为界面胶的单剪试验CFRP表面应变测试数据偏低的问题,通过有限元模型修正的方法对界面本构关键参数进行修正,拟合得到考虑高温劣化影响的本构中三个关键参数的模型公式.得到的有限元模型和界面本构关系劣化公式适用于高温环境中MOC粘贴CFRP-混凝土界面粘结性能的模拟和计算.Carbon fiber reinforced polymer(CFRP)has been widely used in externally pasted concrete structures.Magnesium oxychloride cement(MOC)is considered the most potential interfacial bonding material for CFRP−concrete to replace organic adhesive in high−temperature working environments because of its excellent mechanical and high−temperature resistance.In this study,the XRD phase composition analysis was carried out for the optimized modified MOC,and the deterioration of MOC strength after the high temperature was explained microscopically.Then,the interfacial bond performance after high−temperature treatment was analyzed through the single−lap shear test of the interface of CFRP−concrete with MOC adhesive.The test results show that the reinforcing effect of CFRP−concrete structure with modified MOC adhesive is better,and it can keep some strength after high−temperature damage.Finally,in order to solve the problem of low surface strain test data got in CFRP surface strain test with MOC as interface adhesive,the key constitutive parameters of the interface were modified by finite element model modification,and the model formulas of three key parameters were obtained with curve fitting,considering the effect of high-temperature deterioration.The finite element model and the deterioration formula of interface constitutive relation in this study can be used to simulate and calculate the interfacial bond performance of CFRP−concrete interface bonded with MOC in high−temperature environ-ments.

关 键 词：粘结滑移关系 CFRP-混凝土界面 氯氧镁水泥 高温损伤 有限元方法 

分 类 号：TU375[建筑科学—结构工程]