高性能粉煤灰混凝土工作性能与收缩性能研究  

Workability and shrinkage property of high-performance fly ash concrete

作　　者：汪潇[1] 王宇斌[2] 杨留栓[1] 朱新锋[1] 

机构地区：[1]河南城建学院土木与材料工程系,河南平顶山467036 [2]西安建筑科技大学材料科学与工程博士后流动站,陕西西安710055

出　　处：《河南城建学院学报》2012年第5期1-4,16,共5页Journal of Henan University of Urban Construction

基　　金：河南省自然科学基金项目(08062031)

摘　　要：在对不同粉煤灰掺量混凝土的坍落度、扩展度和坍落度经时损失测定的基础上,研究了粉煤灰掺量为50%和60%的混凝土在不同水胶比条件下的收缩性能。研究结果表明:与基准混凝土相比,粉煤灰可以有效提高混凝土的流动性,降低其坍落度经时损失;对于煤灰掺量为50%和60%的混凝土,其初期收缩较快,后期收缩较为缓慢;尽管粉煤灰可以改善混凝土的收缩性能,但对其收缩变化趋势影响不大。In this paper,based on the measure of slump,slump flow and gradual loss of fly ash concrete,the shrinkage properties of concretes with fly ash contents of 50% and 60% were investigated at different in water-binder ratio.The results show that fly ash can effectively increase the fluidity of concrete and decrease its gradual loss,compared with the concrete without fly ash,the initial shrinkages of the concretes with fly ash contents of 50% and 60% increase so rapidly and their later shrinkages relatively slowly increase.Moreover,fly ash can certainly improve their shrinkage properties,but almost have no effect on the tendency of shrinkage.

关 键 词：混凝土 粉煤灰 坍落度 收缩性能 经时损失 

分 类 号：TU528.01[建筑科学—建筑技术科学]