混杂PE/PVA纤维EGC与混凝土的界面粘结性能试验研究  

Experimental Study on Interfacial Bonding Performance Between Engineered Geopolymer Composites with Hybrid PE/PVA Fiber and Concrete

作　　者：褚丽晶[1,2] 卓柯先 杨泽铭 李潮森 刘润安 林嘉祥 CHU Lijing;ZHUO Kexian;YANG Zeming;LI Chaosen;LIU Run’an;LIN Jiaxiang(Guangzhou Urban Planning&Design Survey Research Institute Co.,Ltd.,Guangzhou 510060,China;Guangdong Provincial Key Laboratory of Urban Perception,Monitoring and Early Warning Enterprises,Guangzhou 510060,China;School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广州市城市规划勘测设计研究院有限公司,广州510060 [2]广东省城市感知与监测预警企业重点实验室,广州510060 [3]广东工业大学土木与交通工程学院,广州510006

出　　处：《硅酸盐通报》2025年第2期463-473,500,共12页Bulletin of the Chinese Ceramic Society

基　　金：广东省城市感知与监测预警企业重点实验室基金项目(2020B121202019);国家自然科学基金(12002090)。

摘　　要：工程地聚物基复合材料(EGC)具备优异的拉伸延性和裂缝控制能力,在混凝土结构修复领域具有潜力,但高成本和对EGC-混凝土界面粘结机制理解的缺乏限制了EGC的广泛应用。本文采用聚乙烯(PE)纤维和国产聚乙烯醇(PVA)纤维制备了混杂PE/PVA纤维EGC(PE/PVA-EGC),并开展了EGC-混凝土界面粘结性能试验研究,通过斜剪试验探讨了单掺PE纤维掺量、混杂PE/PVA纤维比例及前驱体比例对界面粘结性能的影响规律和机理。结果表明,增加PE纤维含量、PVA纤维替代率、矿渣含量和混凝土基体强度均能提高混凝土的界面剪切粘结强度。当单掺PE纤维掺量从1.0%(体积分数)增加到2.0%时,试件的界面剪切粘结强度增加了13.24%;界面剪切粘结强度随着PVA纤维替代率和基体强度的增加而逐渐增大;当既有混凝土强度等级为C50时,混凝土与EGC有着最佳的粘结性能。因此,在适当的基体强度下,混杂PE/PVA纤维能有效改善EGC与既有混凝土的界面粘结性能并控制修复或加固成本。Engineered geopolymer composites(EGC)exhibit excellent tensile ductility and crack control capabilities,making it promising materials for concrete structure repair.However,EGC high cost and the lack of understanding regarding the bonding mechanisms between EGC and concrete have limited EGC widespread application.By using polyethylene(PE)fiber and domestically produced polyvinyl alcohol(PVA)fiber,hybrid PE/PVA fiber EGC(PE/PVA-EGC)were prepared and the bonding performance at EGC-concrete interface was investigated.Slant shear tests were conducted to explore the effect mechanisms of varying PE fiber content,hybrid PE/PVA fiber ratio,and precursor ratio on the interfacial bonding performance.Results indicate that increasing PE fiber content,PVA fiber replacement ratio,ground granulated blast furnace slag content and concrete strength can improve the interfacial shear bonding strength.Increasing the PE fiber content from 1.0%(volume fraction)to 2.0%improves the interfacial shear bonding strength of specimens by 13.24%.The interfacial shear bonding strength increases with higher replacement ratio of PVA fiber and the strength of matrix.The best bonding performance is observed when the existing concrete strength grade is C50.In conclusion,with an appropriate matrix strength,hybrid PE/PVA fiber can effectively enhance the interfacial bonding performance between EGC and existing concrete while controlling repair or reinforcement costs.

关 键 词：工程地聚物基复合材料 PE纤维 PVA纤维 界面粘结性能 斜剪试验 

分 类 号：TU528[建筑科学—建筑技术科学]