文献类型：期刊文献

中文题名：石膏与聚羧酸对C_3A水化进程及产物组成的影响

英文题名：Influence on C_3A Hydration Process and the Constitution of C_3A Hydration Products by Adding Polycarboxylate Superplasticizers and Gypsum

作者：赵芬娜[1];邓最亮[2,3];郑柏存[1];冯中军[2,3]

机构：[1]华东理工大学体育新材料研发中心,上海200237;[2]上海建筑外加剂工程技术研究中心,上海200237;[3]上海三瑞高分子材料有限公司,上海200237

年份：2013

卷号：35

期号：4

起止页码：11

中文期刊名：武汉理工大学学报

外文期刊名：Journal of Wuhan University of Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD_E2013_2014】；

基金：云南省科技厅省院省校科技合作专项(2009AD008)

语种：中文

中文关键词：铝酸三钙(C3A);石膏;聚羧酸减水剂;水化反应;水化产物

外文关键词：C3 A gypsum polycarboxylate superplasticizers; hydration reaction hydration product

摘要：研究了石膏、聚羧酸减水剂对固相法制备的铝酸三钙(C3A)水化反应的影响。结果表明,纯水条件下,C3A水化产物为C3AH6,水化放热总量约为879.99J/g,水化反应2h时放热量达到最大;石膏加入后会使体系水化放热时间延长,同时会改变C3A水化产物组成:石膏加入量较小时,水化产物主要为AFm;石膏过量时,水化产物只有AFt;聚羧酸减水剂的加入也会延缓C3A水化反应,且在同一反应龄期内,随着聚羧酸减水剂掺量的增大,C3A的水化程度呈降低趋势。利用电导率进行测试,可以发现聚羧酸减水剂的加入会降低液相中钙离子浓度,从而延缓了C3A的水化。
The effect caused by gypsum and polycarboxylates on the hydration reaction of tricalcium aluminate （Ca A） was studied. Ca A was prepared by solid-solid reaction. The results show that Ca AH6 is the main hydration product in pure water. Total hydration heat evolved for Ca A is approximately 879. 99 J/g, and it has reached maximum in two hours. In the gypsum system, the addition of gypsum prolongs the time of hydration heat evolved for Ca A. At the same time, gyp- sum changes the constitution of Ca A hydration products. When the gypsum of small addition, AFro as the main hydration product. When the gypsum was excessive,AFt as the main hydration product. The polycarboxylate superplasticizer defered the hydration reaction of C3 A as well. And in the same Ca A hydration reaction period the degree of hydration decreased by the increase of addition of polycarboxylates. The conductivity tests reflected that the existence of polycarboxylates decreased the concentration of calcium ion, thus delaying the hydration reaction of C3 A.