硅烷偶联剂改性聚丙烯纤维水泥基复合材料的性能研究  

Performance of Silane Coupling Agent Modified Polypropylene Fiber Cement-Based Composites

作　　者：孙嘉琦 刘曦 王传林 苏芝棋 鲁鑫[1] 麦靖敏 SUN Jiaqi;LIU Xi;WANG Chuanlin;SU Zhiqi;LU Xin;MAI Jingmin(Department of Civil and Intelligent Construction Engineering,Shantou University,Shantou 515063,China;Guangdong Engineering Center for Structure Safety and Health Monitoring,Shantou 515063,China)

机构地区：[1]汕头大学土木与智慧建设工程系,汕头515063 [2]广东省结构安全与监测工程技术研究中心,汕头515063

出　　处：《硅酸盐通报》2024年第7期2355-2362,2371,共9页Bulletin of the Chinese Ceramic Society

基　　金：广东省自然科学基金资助项目(2023A1515012727);广东省普通高校青年创新人才资助项目(2021KQNCX021);大学生创新创业项目(202310560013)。

摘　　要：本文使用不同类型(KH550和KH560)和不同浓度(0.5%、1.0%、1.5%和2.0%,质量分数)的SCA对聚丙烯纤维(PPF)进行表面改性,通过无侧限抗压强度试验和抗折试验,研究了SCA改性聚丙烯纤维水泥基复合材料的承压能力,并使用扫描电子显微镜对改性后的聚丙烯纤维水泥基复合材料进行了微观表征。结果表明:KH560改性聚丙烯纤维对水泥基复合材料的流动度影响较大,KH550次之;整体上,SCA浓度越接近1.5%,对聚丙烯纤维水泥基复合材料流动度的影响越大;随着KH550浓度增大,水泥基复合材料孔隙率总体呈降低趋势,随着KH560浓度增大,水泥基复合材料孔隙率呈先下降后上升的趋势,并且浓度为1.5%时孔隙率最小;两种SCA均提高了PPF表面的粗糙度,并能在PPF-SCA-基体界面实现化学键连接;两种SCA对聚丙烯纤维水泥基复合材料抗折强度的影响较小,但能有效提高抗压强度。总体而言,KH550改性效果优于KH560。In this paper,different types(KH550 and KH560)and different concentrations(0.5%,1.0%,1.5%and 2.0%,mass fraction)of SCA were used to modify the surface of polypropylene fiber(PPF).The bearing capacity of SCA modified polypropylene fiber cement-based composites was studied by unconfined compressive strength test and flexural test,and the modified polypropylene fiber cement-based composites were characterized by scanning electron microscopy.The results show that KH560 modified polypropylene fiber has a great influence on the fluidity of cement-based composites,followed by KH550.On the whole,the closer the SCA concentration is to 1.5%,the greater the influence on the fluidity of polypropylene fiber cement-based composites is.With the increase of KH550 concentration,the porosity of cement-based composites generally decreases.With the increase of KH560 concentration,the porosity of cement-based composites decreases first and then increases,and the porosity is the smallest when the concentration is 1.5%.Both SCAs improve the surface roughness of PPF and achieve chemical bonding at PPF-SCA-matrix interface.The two kinds of SCA have little effect on the flexural strength of polypropylene fiber cement-based composites,but can effectively improve compressive strength.Overall,the modification effect of KH550 is better than KH560.

关 键 词：硅烷偶联剂 聚丙烯纤维 水泥基复合材料 表面改性 力学性能 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]