活化煤矸石掺合料对高性能混凝土干缩的影响  

Influence of activated coal gangue to shrinkage of high-performance concrete

作　　者：蔺喜强[1] 王栋民[2] 冯建华[1] 霍亮[1] 智艳飞[1] 李国友[1] 

机构地区：[1]中国建筑股份有限公司技术中心,北京101300 [2]中国矿业大学(北京),北京100083

出　　处：《混凝土》2013年第7期56-58,61,共4页Concrete

基　　金：中建股份(CSCEC-2010-Z-01)

摘　　要：活化煤矸石掺合料的需水量较粉煤灰和矿粉高,煅烧煤矸石粉对混凝土有早期的增强作用,且具有后期的强度增长保持能力;其活性介于粉煤灰和矿渣之间,比较接近矿渣。随水灰比的降低,煤矸石混凝土干缩增大,在相同掺量下,活化煤矸石粉作掺合料的混凝土相较掺加粉煤灰的干缩率大,与掺加矿粉的混凝土干缩率差别不多。合理掺量下,煤矸石粉混凝土的干缩率均小于纯水泥混凝土。煤矸石与粉煤灰双掺复合使用可有效降低混凝土的干缩。Compared with fly ash and slag,admixtures of the gangue need more water in concrete.Calcined coal gangue had increased the early strength and late strength increasing retention capacity.Its activity between fly ash and slag,relatively closed to the slag.With decreasing water-cement ratio,gangue concrete shrinkage increased.In the same dosage conditions,activated coal gangue concrete shrinkage rate was large compared with fly ash,and had the same drying shrinkage of concrete mixed with slag.Reasonable dosage,the gangue concrete shrinkage rate less than plain cement concrete.Gangue and fly ash composite use could effectively reduce the drying shrinkage of concrete.

关 键 词：活化煤矸石 高性能混凝土 力学性能 干缩 

分 类 号：TU528.041[建筑科学—建筑技术科学]