高效减水剂
尾矿
材料科学
集聚经济
复合材料
球形填料
岩土工程
化学工程
水泥
冶金
地质学
工程类
作者
Zhenbang Guo,Jingping Qiu,Haiqiang Jiang,Xing Jin,Xiaogang Sun,Zhengyu Ma
标识
DOI:10.1016/j.powtec.2020.12.035
摘要
To improve the flowability of ultrafine-tailings cemented paste backfill (UTCPB) while keeping water content low, superplasticizers (SP) are usually used. The water film thickness (WFT) theory was introduced to investigate the flowability of UTCPB incorporating SP. The obtained results show that the packing density of particles increases significantly with the increase of SP dosage due to the improved particle size distribution of the flocs by de-agglomeration effect of SP. The flow spread of fresh UTCPB can be characterized by the unary exponential-type function of WFT to some extent due to the weakened direct effect of SP dosage by high water content. Flocs still exist in the fresh UTCPB incorporating SP and the WFT of flocs (FWFT) can be regarded as the only factor controlling the flow performance of fresh UTCPB. The results presented in this study will contribute to a better understanding of the flow behaviour of UTCPB with SP.
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