潮湿环境下原位聚合修补砂浆的黏接性能及增黏机理  

Interface bonding performance and enhancement mechanism of in-situ polymerization modified mortar under wet environments

作　　者：邵丽静 冯攀 刘明星 王伟 洪锦祥 缪昌文[1,2] Shao Lijing;Feng Pan;Liu Mingxing;Wang Wei;Hong Jinxiang;Miao Changwen(School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;State Key Laboratory of High Performance Civil Engineering Materials,Nanjing 210008,China)

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]高性能土木工程材料国家重点实验室,南京210008

出　　处：《东南大学学报（自然科学版）》2023年第5期749-755,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51890904,52122802,52078126);江苏省科技创新资助项目(BK20222004,BZ2022036)。

摘　　要：为了提高潮湿恶劣环境下水泥基修补材料的修复效果,通过在水泥基修补砂浆中掺入有机物单体、引发剂和交联剂等使其在砂浆中原位发生聚合.利用抗拉黏接强度测试探究了原位聚合改性砂浆对干燥和潮湿界面黏接性能的影响,同时通过流动性和凝结时间测试探究砂浆的工作性能.研究结果表明:原位聚合改性砂浆具有良好的工作性能和较短的凝结时间,且能够显著增强砂浆与基体的界面黏接性能;相对于空白组,其28 d的干燥和潮湿界面黏接强度最高可增加3.7倍和13.0倍;由于聚合后在潮湿界面的钉扎锚固作用,其潮湿界面的黏接强度最高可达干燥界面的1.6倍,表明了原位聚合改性修补砂浆在潮湿环境下具有良好的修补效果.To improve the repair effect of cement-based materials under wet environment,organic monomers,initiators and crosslinkers were added to the cement-based repairing mortars for in-situ polymerization in it.The bonding strength tests were used to explore the influence of in-situ polymerization modified mortar on the dry and wet interface bonding properties.Meanwhile,the workability mortar was investigated by flowability tests and setting time tests.Results show that in-situ polymerization modified mortar possess good workability and short setting time and can significantly enhance the interfacial bonding properties of mortar with matrix.Compared with the blank group,its wet and dry interface bonding strengths are increased by up to 3.7 times and 13.0 times at 28 d.Moreover,the bonding strength of the wet interface is up to 1.6 times that of the dry interface due to the anchoring action of polymers at the wet interface after polymerization,indicating the good repair effect of in-situ polymerization modified mortar under wet environment.

关 键 词：修补砂浆 原位聚合 潮湿环境 界面黏接性能 

分 类 号：TU57[建筑科学—建筑技术科学]