PVA胶粉和PP纤维对碱矿渣自流平修补砂浆粘结性能的影响  

Effects of PVA Latex Powder and PP Fiber on Bonding Property of Alkali-Activated Slag Self-Leveling Repair Mortar

作　　者：何娟 武佳涵 朱明明 任海涛 桑国臣[3] HE Juan;WU Jiahan;ZHU Mingming;REN Haitao;SANG Guochen(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;XAUAT Engineering Technology Co.,Ltd.,Xi'an 710055,China;School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]西安建筑科大工程技术有限公司,西安710055 [3]西安理工大学土木工程与建筑学院,西安710048

出　　处：《硅酸盐通报》2024年第11期4130-4139,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52078420)。

摘　　要：粘结界面是旧混凝土结构修补后的薄弱环节,是影响修补砂浆与混凝土基体界面粘结性能的重要因素。本文以碱矿渣(AAS)水泥作为胶凝材料制备修补砂浆,通过对流动性、界面弯拉强度、界面拉伸强度、微观形貌等进行测试,研究了聚乙烯醇(PVA)胶粉和聚丙烯(PP)纤维对碱矿渣自流平修补砂浆(ASLRM)界面粘结性能和微观结构的影响。结果表明,PVA胶粉和PP纤维均能有效提高ASLRM的界面粘结性能,二者复掺时,28 d界面弯拉强度最高可提高43.1%,14 d界面拉伸强度最高可提高69.9%。The bonding interface is the weak link of old concrete structure after repair,and it is an important factor affecting the bonding properties of the interface between repair mortar and concrete matrix.In this paper,AAS cement was used as cementitious material to prepare repair mortar.The effects of polyvinyl alcohol(PVA)latex powder and polypropylene(PP)fiber on the interfacial bonding properties and microstructure of alkali-activated slag self-leveling repair mortar(ASLRM)were studied by fluidity test,interfacial flexural tensile strength test,interfacial tensile strength test and microscopic test.The results show that both PVA latex powder and PP fiber can effectively improve the interfacial bonding properties of ASLRM.When the two are mixed,the interfacial flexural tensile strength of 28 d increases by 43.1%,and the interfacial tensile strength of 14 d increases by 69.9%.

关 键 词：碱矿渣水泥 自流平修补砂浆 PVA胶粉 PP纤维 粘结性能 粘结界面 

分 类 号：TU528[建筑科学—建筑技术科学]