UFA水泥基材料早期自干燥及自收缩研究  

Research on Early Self-desiccation and Autogenous Shrinkage of Cement-based Materials Containing Ultra-fine Fly Ash

作　　者：高英力[1] 马保国[1] 周士琼[2] 

机构地区：[1]武汉理工大学硅酸盐材料工程教育部重点实验室,武汉430070 [2]中南大学土木建筑学院,长沙410075

出　　处：《武汉理工大学学报》2007年第3期30-34,共5页Journal of Wuhan University of Technology

基　　金：铁道部科技研究开发项目(2000G031);国家"863"计划项目(2005A332010)

摘　　要：基于水泥石孔隙理论对超细粉煤灰(Ultra-fine fly ash,简称UFA)水泥基材料的早期自干燥效应进行了理论分析及试验研究。在此基础上,采用改进的混凝土自收缩试验装置对UFA混凝土的早期自收缩变形进行了测试。结果表明,相比于基准水泥石,UFA水泥石内部自干燥程度大大降低;且随着UFA的掺入,混凝土早期水化反应的有效水灰比增大,自收缩变形随之减小,进一步证明水泥基材料早期内部孔隙的自干燥效应与混凝土的早期自收缩变形具有较好的相关性。According to the pore theory of hardened cement paste, early self-desiccation effect of cement-based materials con- taining ultra-fine fly ash （UFA） was researched by the combination of theory and experience. And the improved testing device of autogenous shrinkage was used to test early autogenous shrinkage of UFA concrete. The results indicated that the inner selfdesiccation degree of hardened cement paste containing UFA reduced more than that of ordinary hardened cement paste. On the other hand, the effective water/cement ratio of concrete increase in the course of early hydration, thus autogenous shrinkage reduced with the addition of UFA, and the more UFA was added, the less chemical shrinkage would be. From the above the truth, it was proved that the inner early self-desiccation effect of cement-based materials and early autogenous shrinkage of concrete had good correlation.

关 键 词：超细粉煤灰 水泥基材料 早期 自干燥 自收缩 

分 类 号：TU528.04[建筑科学—建筑技术科学]