混凝土恒电压RCM测试方法的边部效应研究  

Investigation of edge effect of concrete specimen on constant voltage RCM test

作　　者：杨绿峰[1,2] 赵家琦[1,2] 张航 杨恺 陈正[1,2] YANG Lufeng;ZHAO Jiaqi;ZHANG Hang;YANG Kai;CHEN Zheng(Key Laboratory of Disaster Prevention and Structural Safety,Ministry of Education,Nanning 530004,China;School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004 [2]广西大学土木建筑工程学院,广西南宁530004

出　　处：《混凝土》2020年第5期148-151,共4页Concrete

基　　金：国家自然科学基金项目(51678165)。

摘　　要：恒电压RCM试验时混凝土试块中氯离子扩散深度存在明显的边部效应,影响氯离子扩散系数测试结果的准确性.鉴于此,开展了68组混凝土试块的恒电压RCM试验,定义了试块测点上氯离子扩散深度的标准值,利用数理统计方法定量分析了边部效应对氯离子扩散深度及氯离子扩散系数的影响,确定了边部效应的影响范围,进而通过回归分析建立了内部氯离子扩散系数与全截面氯离子扩散系数之间的关系模型.研究表明,边部效应的影响范围为试块周边外表面延伸至试块内部10 mm的区域;传统的未排除边部效应影响的恒电压RCM测试结果会高估混凝土的氯离子扩散系数;内部氯离子扩散系数与全截面氯离子扩散系数之间具有较强的相关性。The influence of edge effect on chloride diffusion depth and chloride diffusion coefficient was investigated in constant voltage RCM test by means of laboratory tests with 68 sets of concrete specimens.Firstly,the normal depth of chloride diffusion at each measure point was defined,while the influence of edge effect on chloride diffusion depth and chloride diffusion coefficient was investigated based on the mean and standard deviation of the normal depth of chloride diffusion.Then,the scope of edge effect was determined.Finally,based on regression analysis,the relationship between the chloride diffusion coefficient for the center of specimen and that for the whole specimen were developed.Results show that the scope of the edge effect is limited within about 10mm depth from the surface around the specimen,meanwhile the traditional constant voltage RCM test without obviating the influence of edge effect will overestimate the chloride diffusion coefficient.Furthermore,there exists a linear relationship between the chloride diffusion coefficient for the center of specimen and that for the whole specimen.

关 键 词：恒电压RCM 边部效应 氯离子扩散深度 氯离子扩散系数 

分 类 号：TU528.01[建筑科学—建筑技术科学]