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羟基羧酸类缓凝剂对水泥水化的缓凝机理
作者: 鑫1 2  诚1 2 冉千平1 2 刘加平1 3 
单位:1. 高性能土木工程材料国家重点实验室 江苏省建筑科学研究院有限公司 南京 210008  2. 江苏苏博特新材料股份有限公司 南京 211103 3. 东南大学材料科学与工程学院 南京 211189 
关键词:羟基羧酸类缓凝剂 羟基 羧基 吸附 络合 
分类号:TU528.042.3
出版年,卷(期):页码:2018,46(2):181-186
DOI:
摘要:

采用水化微量热仪、电导率仪和X射线衍射仪研究了羟基羧酸类缓凝剂分子结构中羟基和羧基对水泥水化的影响,并对缓凝剂的吸附和络合能力进行了比较。结果表明:羟基羧羧类缓凝剂会延缓水泥矿物的溶解,过饱和溶液的形成及水化产物的生成,主要通过阻滞水化产物的结晶成核过程来推迟水化进程,不影响水化加速期的水化反应速率。吸附作用为影响水化的主要因素,随分子结构中羟基或羧基的增多,其吸附和络合能力均会增强

The influence of hydroxyl and carboxyl of hydroxy carboxylic acid retarder on the cement hydration was investigated by microcalorimeter, conductivity meter and X-ray diffractometer. The adsorption and complexation ability of retarders were also analyzed. Results show that the dissolution of cement grain, the formation of supersaturated solution and the generation of hydration products are delayed by hydroxy carboxylic acid retarders. The crystallization of hydration products is blocked, but the reaction rate during acceleratory period is not affected. The adsorption of retarders is a dominant factor affecting the hydration of cement. The adsorption and complexation ability of retarders will enhance as the hydroxyl and carboxyl in the molecular structure increase.

基金项目:
国家青年基金(51408270);江苏省青年基金(BK20141011)资助项目。
作者简介:
余 鑫(1990—),男,硕士,助理工程师。
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