Cai Yang, Liu Qiumei, Wu Fufei, Dong Shuangkuai, Zhang Qiuyue, Wang Jing, Luo Pengfei, Yang Xin
School of Materlals and Architectural Engineering, Guizhou Normal University, Guiyang 550025, China.
School of Civil Engineering, Guizhou Institute of Technology, Guiyang 550025, China.
Materials (Basel). 2025 Aug 7;18(15):3716. doi: 10.3390/ma18153716.
The resource utilization of construction waste and industrial solid waste is a crucial aspect in promoting global urbanization and sustainable development. This study focuses on the preparation of mine backfill materials using construction waste in combination with various industrial solid wastes-ground granulated blast furnace slag (GGBFS), fly ash (FA), silica fume (SF), phosphorus slag (PS), fly ash-phosphorus slag-phosphogypsum composite (FA-PS-PG), and fly ash-phosphorus slag-β-phosphogypsum composite (FA-PS-βPG)-under different substitution rates (50%, 55%, 60%) as control parameters. A total of 19 mix proportions were investigated, evaluating their slump, dry density, compressive strength, uniaxial compressive stress-strain relationship, micromorphology, and phase composition. The results indicate that, compared to backfill materials prepared with pure cement, the incorporation of industrial solid wastes improves the fluidity of the backfill materials. At 56 days, the constitutive model parameter increased to varying degrees, while parameter decreased, indicating enhanced ductility. The compressive strength was consistently higher with PS at all substitution rates. The FA-PS-PG mixture with a 50% substitution rate achieved the highest 56-day compressive strength of 8.02 MPa. These findings can facilitate the application of construction waste and industrial solid waste in mine backfilling projects, delivering economic, environmental, and resource-related benefits.
建筑垃圾和工业固体废弃物的资源利用是推动全球城市化和可持续发展的关键环节。本研究聚焦于利用建筑垃圾与各种工业固体废弃物（磨细粒化高炉矿渣（GGBFS）、粉煤灰（FA）、硅灰（SF）、磷渣（PS）、粉煤灰-磷渣-磷石膏复合材料（FA-PS-PG）以及粉煤灰-磷渣-β-磷石膏复合材料（FA-PS-βPG））制备矿山回填材料，并将不同替代率（50%、55%、60%）作为控制参数。共研究了19种配合比，评估其坍落度、干密度、抗压强度、单轴抗压应力-应变关系、微观形貌和相组成。结果表明，与纯水泥制备的回填材料相比，掺入工业固体废弃物提高了回填材料的流动性。在56天时，本构模型参数 不同程度增加，而参数 减小，表明延性增强。在所有替代率下，PS的抗压强度始终更高。替代率为50%的FA-PS-PG混合物在56天时达到最高抗压强度8.02MPa。这些研究结果有助于建筑垃圾和工业固体废弃物在矿山回填工程中的应用，带来经济、环境和资源相关效益。
