WENG Zhenqi1, SHI Zheqi1, XU Chengkui1, XU Shanlin1, SUN Honglei1,*, WANG Lingjun2, CAI Yuanqiang1
1 College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, China 2 College of Civil Engineering, Guizhou Minzu University, Guiyang 550025, China
Abstract: The coal mining industry generates significant waste (e.g., coal gangue and slime), driving the need for low-carbon, cost-effective solidification materials to facilitate the recovery and recycling of these resources. In this work, a ternary solid waste-based solidifying agent GCM (composed of ground granulated blast furnace slag (GGBS), calcium carbide residue (CCR), and coal-based metakaolin (MK)) was used to solidify coal slime, where MK was derived from waste coal gangue. Unconfined compressive strength tests were performed to evaluate the effects of CCR, GGBS, and MK content ratios and curing time. X-ray diffraction (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP) analyses revealed that the enhanced strength of solidified coal slime stemmed from synergistic slag hydration and MK polyme-rization, forming C-S-H and N-A-S-H gels that densified the microstructure by adsorbing clay particles and filling pores. The feasibility of using solidified coal slime mixed with coal gangue aggregates as subgrade material was explored through road performance tests. Experimental results demonstrated that at the optimal composition (2.5% MK, 7.5% GGBS, 10% CCR), the solidified slime reached a 28-day unconfined compressive strength of 2 MPa. This work may provide theoretical support for the development of low-carbon, solid waste-based solidifying agents and the sustainable utilization of coal gangue and slime.
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2026, Vol. 40 
