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橡胶自密实混凝土和易性及力学性能研究
作者：阎磊
（山西省建设工程质量监督管理总站，山西 太原 030013）
摘要：利用3种不同粒径的橡胶颗粒替换混凝土中的骨料，分析了橡胶自密实混凝土（SCRC）的新拌及硬化性能。对新拌混凝土进行坍落度、T500和J环试验，对硬化混凝土的7 d、28 d抗压强度、抗拉强度、密度和28 d应力-应变进行研究。得出橡胶自密实混凝土中的最佳橡胶颗粒取代率和最佳粒径，以优化SCRC的新拌和硬化后性能。结果表明，随着橡胶取代率的增加，混凝土的坍落度和J环流动度减小，T500延长；橡胶颗粒为5 mm的混凝土抗压强度和劈裂抗拉强度最高；由应力-应变曲线可以看出，橡胶粒径的增加会导致更大的峰值应变。
关键词：橡胶自密实混凝土（SCRC）；橡胶颗粒；骨料粒径；性能研究
中图分类号：TU528.041 文献标识码：A 文章编号：1001-702X（2020）05-0022-04
Study on the workability and mechanical properties of rubber self-compacting concrete
YAN Lei
（Shanxi Construction Engineering Quality Supervision and Supervision Terminal，Taiyuan 030013，China）
Abstract：Three different particle size rubber particles were used to replace the aggregate in concrete，and the new mixing and hardening properties of self-compacting rubber concrete were analyzed. The slump，T500 and J-ring tests were carried out on fresh concrete，and the 7-day and 28-day compressive strength，tensile strength，density and stress-strain of 28 days of concrete were tested. In this study，the optimal design content of self-compacting concrete was proposed to optimize the performance of SCRC. The results show that as the rubber substitution rate increases，the concrete slump and J-ring fluidity decrease，and T500 prolongs. The concrete with a rubber particle size of 5 mm has the highest compressive strength and splitting tensile strength. From the stress-strain curve，it can be seen that an increase in the rubber particle size leads to a greater peak strain.
Key words： self-compacting rubber concrete（SCRC），rubber particles，aggregate particle size，properties study