石场尾矿砂用作混凝土细集料的试验研究_宋旭艳.pdf

Vol.35 No.6 35 6 2012 11 Non-Metallic Mines November, 2012 1 1 2 1 2150112 311100 (180+20) mm73 C30 28 d 8.7% TU528.041 A 1000-8098(2012)06-0009-04 Study on Quarry Tailing Sand as Concrete Fine Aggregate Song Xuyan1 Han Jingyun1 Xiang Zuotie2 (1 College of Civil Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu 215011; 2 Concrete Branch, Zhejiang Tianhe Building Materials Group Co., Ltd., Hangzhou, Zhejiang 311100) Abstract In raw tailing sand it can be seen more coarse particles and poor particle size distribution, but it properly mixed with fi ne sand can make gradation improved and may be suitable for preparation of concrete. Test showed that tailing mixed sand, as concrete fi ne aggregate, may increase water demand of fresh concrete. But through introducing superplasticizer to maintain water demand consistent, slump of concrete mixing materials can reach (180+20) mm, which may obtain the same workability as concrete with natural medium sand. For C30 concrete prepared with tailing mixed sand that the mass ratio of tailing sand and fi ne sand was 7:3the strength at 28 d can increase by 8.7% than that in natural medium sand concrete. The shrinkage of concrete prepared with tailing mixed sand may be more than that of natural medium sand concrete. However, with the improvement of gradation and fi neness modulus of mixed sand, the effect of tailing mixed sand on contract prop