矿物掺和料和再生骨料对混凝土的收缩性能的影响  

Influence of Mineral Admixture and Recycled Aggregate on Shrinkage of Concrete

作　　者：张健[1] 杜辉[1] 张财 李秋义[1] 

机构地区：[1]青岛理工大学土木工程学院,青岛266033 [2]青岛市建筑工程质量检测中心有限公司,青岛266012

出　　处：《青岛理工大学学报》2009年第4期145-149,153,共6页Journal of Qingdao University of Technology

基　　金：国家"十一五"科技支撑计划重点课题资助项目(2006BAJ02B0504)

摘　　要：研究了再生粗、细骨料取代量、矿物掺和料等因素对再生混凝土收缩性能的影响.结果表明:高品质再生细骨料混凝土的后期收缩值高于天然骨料混凝土,且随着再生细骨料取代量的增加而增大;高品质再生粗骨料混凝土的收缩值接近天然骨料混凝土;粉煤灰和普通矿粉相比能够很好的降低再生混凝土的早期和后期收缩值,超细矿粉和硅灰都能减少再生混凝土的后期收缩值,但硅灰增加了再生混凝土的早期收缩值.The influences of the replacement rate of recycled coarse and fine aggregate, mineral admixture on the shrinkage of high-performance recycled concrete are studied in this paper. Results show that, the aftershrinkage of high-quality recycled fine aggregate concrete is higher than that of natural aggregate concrete, and it increases with the replacement rate. The shrinkage of high-quality recycled coarse aggregate concrete is close to that of natural aggregate concrete. The fly ash is better to reduce the initial and after shrinkage of high-performance recycled concrete than normal slag powder. The superfine slag powder and silica fume both can reduce the aftershrinkage of high-performance recycled concrete, but the silica fume improve the initial shrinkage.

关 键 词：废弃混凝土 高品质再生骨料 收缩 高性能 矿物掺和料 

分 类 号：TU528.041[建筑科学—建筑技术科学]