自密实再生骨料混凝土不同龄期的力学性能  

Mechanical properties of recycled aggregate self-compacting concrete during different curing periods

作　　者：姚大立 余芳 谢关飞 YAO Da-li;YU Fang;XIE Guan-fei(School of Architecture and Civil Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学建筑与土木工程学院

出　　处：《沈阳工业大学学报》2019年第5期589-593,共5页Journal of Shenyang University of Technology

基　　金：国家自然科学基金资助项目(51608331);辽宁省博士启动基金资助项目(201601171)

摘　　要：为了分析自密实再生骨料混凝土(RA-SCC)不同养护龄期的力学性能,并比较自密实再生骨料混凝土(RA-SCC)与天然骨料混凝土(NA-C)、自密实天然骨料混凝土(NA-SCC)的力学性能差异,开展了以养护龄期、混凝土强度、混凝土类型为参数的立方体抗压强度、劈裂抗拉强度试验研究.结果表明:RA-SCC与NA-C、NA-SCC的7 d强度发展速率基本一致,但其56和90 d的强度发展速率则显著高于NA-C,略高于NA-SCC;28 d劈裂抗拉强度比NA-C降低了约38.3%~56.1%,比NA-SCC降低了约17.5%~21.3%;RA-SCC的脆性特征较NA-C和NA-SCC更为明显.In order to analyze the mechanical properties of recycled aggregate self-compacting concrete(RA-SCC)during different curing periods and compare the differences of mechanical properties among RA-SCC,natural aggregate concrete(NA-C)and natural aggregate self-compacting concrete(NA-SCC),the experimental researches on cubic compressive strength and splitting tensile strength with regard to curing period,concrete strength and concrete type were performed.The results show that the strength evolution rate of RA-SCC for 7 d is similar to that of NA-C and NA-SCC,but the strength evolution rate of RA-SCC for 56 d and 90 d is significantly higher than that of NA-C and slightly higher than that of NA-SCC.The splitting tensile strength for 28 d of RA-SCC decreases about 38.3%~56.1%compared with that of NA-C,and decreases about 17.5%~21.3%compared with that of NA-SCC.The RA-SCC has more obvious brittle features compared with NA-C and NA-SCC.

关 键 词：自密实混凝土 再生骨料 天然骨料 抗压强度 劈拉强度 龄期 脆性 

分 类 号：TU[建筑科学]