Yang Baogui, Zheng Zhijun, Jin Junyu, Wang Xiaolong
School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, D11 Xueyuan Road, Haidian District, Beijing 100083, China.
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology-Beijing, D11 Xueyuan Road, Haidian District, Beijing 100083, China.
Materials (Basel). 2023 Jul 27;16(15):5295. doi: 10.3390/ma16155295.
The use of cemented Aeolian sand-fly ash backfill (CAFB) material to fill the mining area to improve the surface subsidence damage caused by underground coal mining is in the development stage. Their performance with large overflow water and strength loss is not well understood. Few research has been conducted to understand the effects of aeolian sand and coal gangue on the rheological properties of CAFB with plasticizers. Therefore, this study aims to investigate the effects of a plasticizer on the rheological properties, specifically yield stress and viscosity, of CAFB prepared with aeolian sand and coal gangue. CAFB mixes containing 0%, 0.05%, and 0.1% plasticizers were prepared, and yield stress and viscosity were determined at different intervals. Additional tests, such as thermal analysis and zeta potential analysis, were also conducted. It was found that the rheological properties of CAFB are the comprehensive manifestation of the composite characteristics of various models. Reasonable particle size distribution and less plasticizer can ensure the stability of the slurry structure and reduce the slurry settlement and the risk of pipe blocking. The findings of this study will be beneficial in the design and production of CAFB material.
采用胶结风积砂-粉煤灰回填（CAFB）材料填充矿区，以改善地下采煤引起的地表沉陷破坏，目前尚处于发展阶段。人们对其在大量溢水和强度损失情况下的性能了解不足。很少有研究探讨风积砂和煤矸石对添加增塑剂的CAFB流变特性的影响。因此，本研究旨在研究增塑剂对用风积砂和煤矸石制备的CAFB流变特性的影响，特别是屈服应力和粘度。制备了含0%、0.05%和0.1%增塑剂的CAFB混合物，并在不同时间间隔测定屈服应力和粘度。还进行了热分析和zeta电位分析等额外测试。结果发现，CAFB的流变特性是各种模型复合特性的综合体现。合理的粒度分布和较少的增塑剂可以确保浆液结构的稳定性，减少浆液沉降和管道堵塞风险。本研究结果将有助于CAFB材料的设计和生产。
