为明确煤矸石(Mc)对地聚物材料的作用机理,以Mc等煤基固废制备的地聚物注浆材料(CGGM)为研究对象,系统研究了Mc掺量和粒径分布对CGGM流变、力学性能的影响,结合MIP、XRD、FTIR和SEM等微观测试手段分析了结石体的微观结构.结果表明,Mc能改善CGGM浆液的稳定性,浆液是典型的黏度时变性幂律型流体,CGGM的流动度、凝结时间及抗压强度均随Mc掺量的递增而减小,当Mc质量分数为50%(占前驱体)时,结石体3d、28d抗压强度分别为2.97MPa和8.89MPa.Mc早期主要起微集料效应及为C-S-H凝胶提供成核位点,后期发生聚合反应.结石体强度的形成主要来自AFt、C-S-H和C-(N)-A-S-H等晶体和凝胶体.

To clarify the function mechanism of coal gangue (Mc) on geopolymer materials, geopolymer grouting material (CGGM) prepared from coal-based solid waste such as Mc was taken as the research object. The influence of Mc content and its particle size distribution on the rheological and mechanical properties of CGGM was systematically studied, and the microstructure of stone body was analyzed by microscopic testing methods such as MIP, XRD, FTIR, and SEM. The research results indicated that the stability of CGGM slurry was improved by Mc, its slurry was typical viscosity time-varying power-law type fluid, and the fluidity, setting time and compressive strength of CGGM decreased with the increase of coal gangue contents. When the mass fraction of coal gangue was 50% (precursor), compressive strength of stone body at 3 days and 28 days reached 2.97MPa and 8.89MPa, respectively. Mc mainly played the role of micro aggregate and provided nucleation sites for C-S-H gel in the early stage, and polymerization occurred in the later stage. Strength was mainly attributed to crystals and gels such as AFt, C-S-H, and C-(N)-A-S-H.

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新疆煤炭资源绿色开采教育部重点实验室开放基金（KLXGY-KB2416）；辽宁省教育厅基本科研项目（LJ212410147063，多源煤基固废制备地聚物关键技术与性能研究）