煤基固废地聚物注浆材料的制备及性能

Preparation and Properties of Coal-Based Solid Waste Geopolymer Grouting Materials

以煤矸石、粉煤灰等为主体胶凝成分,以脱硫石膏和碱性激发剂等为配体,辅以少量外加剂,制备了煤基固废地聚物注浆材料.采用响应面法开展了25组试验,寻找各指标与各因子间的定量规律及各因子水平的最佳配比.结果表明:通过响应面法建立的回归模型与响应曲面很好地反映了改性剂对浆液性能的影响,且能对复掺改性剂的浆液配比进行优化;在改性剂的复合作用下,以大掺量煤基固废制备的地聚物注浆材料黏度低、流动性好,凝结时间、抗压强度及抗渗性能都满足矿井注浆材料的要求,工程应用效果良好.

Coal‑based solid waste geopolymer grouting materials were prepared with coal gangue and fly ash as the main cementitious components,desulfurized gypsum and alkali activator as ligands,with a small amount of admixtures.Twenty‑five sets of experiments were carried out by response surface method to find the quantitative relation among each index and every factor versus the optimal ratio of each factor level.The results show that the regression model and response surface established by the response surface method reflect well the degree of the influence of the modifier on the slurry performance.At the same time,the slurry ratio of the compound modifier can be optimized.Under the compound effect of modifier,the geopolymer grouting material prepared with large content of coal‑based solid waste has low viscosity and good fluidity.In addition,setting time,compressive strength and impermeability meet the requirements of mine grouting material,and has good engineering application effect.