摘要
研究聚羧酸系减水剂(PC)对水泥水化特性的影响对控制和改善混凝土性能具有理论指导价值。本文采用热活性微量热仪研究了C_3A单矿和C_3A-石膏体系在水和PC溶液中的水化过程,并通过XRD、SEM等方法分析了水化产物的组成和形貌。结果表明:C_3A单矿水化时,PC的掺入能使C_3A颗粒分散更好,增大C_3A与水的接触面从而加速了C_3A的水化速率,促进了C_3AH6形成。对于C_3A-石膏体系,C_3A与石膏的摩尔比为1∶3时,PC的掺入抑制AFt晶体的生成和生长。
It is important to investigate the effects of polycarboxylate superplasticizer （PC） on hydration of cement and to improve the performance of concrete. In this paper, the hydration of C3A and C3A-gypsum with water and PC solution had been investigated characterized by hydration heat tested by thermally activated microcalorimeter. The composition and morphology of hydration products were analyzed via X-ray diffraction and scanning electron microscopy. The results indicate that the dissolution of C3A was accelerated as hydrating in PC solution, and the precipitation of C2AH6 was promoted. For C2A-gypsum system （molar ratio of C2A and gypsum=1：3）, the formation and growth of Ettringite would be delayed.
出处
《混凝土与水泥制品》
北大核心
2018年第10期5-8,共4页
China Concrete and Cement Products
基金
国家重点研发计划项目(2016YFB0303601)
关键词
聚羧酸系减水剂
铝酸三钙
水化过程
水泥
Polycarboxylate superplasticizers
Tricalcium aluminate
Hydration
Cement
