外加剂对砂浆收缩性能的影响.pdf

4 ( ) 低　温　建　筑　技　术 2007 年第 4 期 总第 118 期 外加剂对砂浆收缩性能的影响 1 1 2 卢 　爽 , 　王 　政 , 　张 　宇 ( 1 哈尔滨工业大学材料学院 , 　哈尔滨　150006 ; 　2 大庆市达源新型建材公司 , 　黑龙江　大庆　163453) 　　【摘 　要】　本文探讨了影响混凝土中水泥砂浆收缩的主要因素 ,并对其收缩机理进行了初步分析和探讨。 结果表明 ,FDN 减水剂能显著增大水泥砂浆的收缩 ;粉煤灰的掺入能降低水泥砂浆的收缩。试验结果说明 ,外加剂 的颗粒分散效应和矿粉的水化活性是影响水泥砂浆收缩的主要因素。 【关键词】　收缩 ;水泥砂浆 ;外加剂 ( ) 【中图分类号】　TU5024 　　　　　【文献标识码】　A 　　　　【文章编号】　1001 - 6864 2007 04 - 0004 - 03 SHRINKAGE PERFORMANCE OF CEMENT MORTAR RELATED TO ADDING OF ADDTIVE 1 1 2 LU Shuang , 　WANG Zheng , 　ZHANG 　Yu ( 1School of Material and Engineering ,HIT. , 　Harbin 　150006 , 　China ; 2Daqing Dayuan New Construction Material Co. ,Heilongjiang 　Daqing 　163453 , 　China) 　　Abstract :The main factors on the shrinkage of cement paste are studied in this paper ,and preliminary analysis and the discussion on its contraction mechanism has been carried on. The results indicate that the FDN can notably increase the shrinkage of cement mortar ,and adding of the fly ash can reduce the shrinkage of the cement mortar. It shows that ,the admixture particle dispersion effect and slag powder hydrated active ness are the primary factors that affect the shrinkage of the cement mortar.