文档介绍：邓明进等:颗粒的整形工艺对注浆成型碳化硅素坯密度的影响· 1229 ·第36卷第7期***银显色法检测混凝土中***离子的迁移何富强1,史才军2,元强1,郑克仁1(1. 中南大学土木建筑学院,长沙 410075;2. 湖南大学土木工程学院,长沙 410082) 摘要:实验室和工程现场经常用***银显色法检测混凝土中***离子的迁移。有3种***银显色法,即AgNO+KCrO法、AgNO+荧光素法以及AgNO法,其中AgNO法使用最广泛,因为AgNO法测试结果和其他两种方法相似却比其他两种方法容易操作。***银显色法测量的变色边界***离子浓度在很大范围内变化,很多因素诸如混凝土碱度、***银浓度、取样方法以及混凝土中***离子分析方法等均会对变色边界***离子浓度测试结果产生影响。采用***银显色法测试的自由***离子渗透深度以及通过变色边界自由***离子浓度计算的表观扩散系数可以简单、快速地评价混凝土抗***离子渗透性。关键词:***银;显色法;***离子渗透深度;变色边界***离子浓度中图分类号:TU172 文献标志码:A 文章编号:0454–5648(2009)07–1229–06 AgNO3 COLORIMETRIC METHOD USED FOR MEASURING CHLORIDE MIGRATION IN CONCRCRETE HE Fuqiang1,SHI Caijun2,YUAN Qiang1,ZHENG Keren1(1. School of Civil Engineering and Architecture, Central South University, Changsha 410075; 2. College of Civil Engineering, Hunan University, Changsha 410082, China) Abstract: The AgNO3 colorimetric method is often used to measure the chloride ration depth in the laboratory and the field due to its fast and easy operation. There are three AgNO3 colorimetric methods, the AgNO3+K2CrO4 method, the AgNO3+fluoresceine method and the AgNO3 alone method. Among the three methods, the AgNO3 alone method is the most widely used because it has the same accuracy but is much simpler to use than the other two. Reported chloride ion concentrations at the color change boundary vary in a very broad range because of many factors, such as sampling, chloride analysis method, alkalinity of concre