自密实再生骨料混凝土不同龄期的力学性能

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.

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

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.