高性能水泥基材料结合外渗氯离子能力的测试方法对比  

Contrasting method of testing binding capability of chlorideions exosmosed in high performance cement-based materials

作　　者：管学茂[1] 孙国文[2] 王玲[1] 姚燕[1] 

机构地区：[1]中国建筑材料科学研究院,北京100024 [2]河南理工大学材料科学与工程学院,河南焦作454000

出　　处：《混凝土》2005年第11期36-39,45,共5页Concrete

基　　金："973"计划(2001CB6107)资助项目

摘　　要：高性能混凝土掺各种微细掺合料后,由于这些掺合料的自身特性,酸溶时发现部分试样有难溶絮状物质生成,这种物质对氯离子有一定的吸附性,所以增加了测试结合外渗氯离子的难度。本文进行了大量的试验证实:佛尔哈德法可以直接进行滴定分析,能将吸附的氯离子释放出来,这种方法用铁铵矾作指示剂,不仅适合于酸性介质,滴定终点直观,而且测试的精度对实验室研究,高于莫尔法和离子选择电极法。High Performance Concrete adds all kinds of super- fine mineral admixtures which are specially themselves. Using acid to dissolve testing samples finds there is downy substance insolubilized which can absorb chloride ions in acid, so it is difficult to test chloride ions content objectively. Many experiments prove that Volhard method can analyze samples directly and make chloride ions bound release. Titration end point of Volhard Method using ferriammonium sulfate as a indicator that suit acid medium is very perspicuity and testing precision is better than direct potentiometric method and Mohr in laboratory.

关 键 词：测试方法 氯离子 直接电位法 莫尔法 佛尔哈德法 电位滴定法 

分 类 号：TU528.32[建筑科学—建筑技术科学]