薄层UHP-ECC与既有砖墙界面粘结性能研究  

Interface Bonding Property of Thin Layer UHP-ECC with Existing Brick Wall

作　　者：郑国清 ZHENG Guoqing(Zhongsheng Huichuang Construction Development Co.,Ltd.,Fuzhou,Fujian 350003,China)

机构地区：[1]中晟汇创建设发展有限公司,福建福州350003

出　　处：《水利与建筑工程学报》2024年第6期30-36,共7页Journal of Water Resources and Architectural Engineering

基　　金：福建省建设科技研究开发项目(2023-B-8;2023-k-45;2023-k-47)。

摘　　要：超高性能工程用水泥基复合材料(UHP-ECC)加固修复既有砖砌体墙工程中,UHP-ECC与砖墙之间的粘结性能是保证加固效果的关键。为探究UHP-ECC-砖界面的粘结性能,通过双面剪切试验探究界面粗糙度、界面湿润度和有机纤维掺量对界面粘结性能的影响。结果表明:当扣缝深度为25 mm时,界面粘结剪切强度提高了75.31%;界面湿润度的增加使界面粘结剪切强度呈现先增大后减小的趋势,其中湿润状态的界面粘结性能最好;当纤维掺量为2%时,自然面和扣缝5 mm界面粘结剪切强度分别提升了20.05%和29.22%。采用扣缝的界面处理方式可提高界面粗糙度,从而提升界面粘结性能。In the reinforcement and repair of existing brick masonry walls by ultra-high performance concrete(UHP-ECC),the excellent bonding performance between UHP-ECC and brick walls is the key to ensuring the reinforcement effect.Therefore,in order to explore the bonding performance of UHP-ECC-brick interface,the effects of interface roughness,interface wettability and organic fiber content on interface bonding performance were investigated by double-sided shear test.The results show that the 25 mm buckle seam increases the interface shear strength by 75.31%.The increase of interfacial wettability makes the interfacial bonding shear strength increase first and then decrease,and the interfacial bonding performance in the wet state is the best.When the fiber content is 2%,the bond shear strength of the natural surface and the 5 mm interface of the buckle joint is increased by 20.05%and 29.22%,respectively.The way of buckle seam can improve the interface roughness,so as to improve the interface bonding performance.

关 键 词：既有砖砌体墙 结构加固 超高性能工程用水泥基复合材料(UHP-ECC) 双面剪切 界面粘结性能 

分 类 号：TU362[建筑科学—结构工程]