硝酸银显色法测量混凝土中非稳态氯离子迁移系数的误差分析.pdf

报· 20 ·2012年硝酸银显色法测量混凝土中非稳态氯离子迁移系数的误差分析何富强1,史才军2,陈昌萍1,安晓鹏2,童柏辉2(1. 厦门理工学院土木工程与建筑系,厦门 361024;2. 湖南大学土木工程学院,长沙 410082) 摘要:为了评估硝酸银显色法测量非稳态氯离子迁移系数(D)的误差,采用NTBuild 492中的显色法测量了30组含不同矿物掺合料类型、2个水胶比的砂浆试件。试验结果和理论分析表明:如果不控制硝酸银显溶液的喷洒体积,变色边界氯离子浓度(c)~,当变色深度为5mm时,c将产生40%D误差,这对评价高性能混凝土是相当不利的;喷洒的硝酸银溶液体积越小,c的变化越小。基于本文建立的硝酸银喷洒程序[其中硝酸银溶液喷洒体积为(±)L/m],假如采用c=,当变色深度(X)为5mm时,将产生20%D误差。在c=,即使X小于5mm,D误差仍然小于5%。因此,c=。建立的硝酸银喷洒程序及c=。关键词:非稳态氯离子迁移系数;硝酸银显色法;变色边界氯离子浓度;误差中图分类号: 文献标志码:A 文章编号:0454–5648(2012)01–0020–07 网络出版时间:2011–12–29 19:07:42 KI:11-2310/ 网络出版地址:s/detail/ Error Analysis for Measurement of Non-Steady State Chloride Migration Coefficient in Concrete Using AgNO3 Colorimetric Method HE Fuqiang1,SHI Caijun2,CHEN Changping1,AN Xiaopeng2,TONG Baihui2(1. Department of Civil Engineering and Architecture, Xiamen University of Technology, Xiamen 361024; 2. School of Civil Engineering, Hunan University, Changsha 410082, China) Abstract: To evaluate the error of non-steady-state migration coefficient (Dnssm) caused by AgNO3 colorimetric method, colorimetric measurement for 30 mixtures of mortar specimens with different types of binder and water-binder ratios ( and ) were con-ducted according to the NordTest Build492. The experimental results