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为解决充填开采原材料不足的问题,以废弃混凝土为骨料制备胶结充填材料。系统研究了废弃混凝土细骨料和粗骨料对充填材料流动性能及力学性能的影响,确定了废弃混凝土细骨料和粗骨料在充填材料中的添加比例,最后运用响应面分析法得出了矸石-废弃混凝土胶结充填材料的合理配比。结果表明:1)随着废弃混凝土细骨料替代率的增加,充填材料扩展度大体呈增长趋势,坍落度先略有减小后基本稳定,而随着废弃混凝土粗骨料替代率及水泥掺量的增加,充填材料坍落度及扩展度在逐渐减小,充填材料抗压强度随水泥掺量的增加而增大,随废弃混凝土骨料替代率的增加呈先增大后减小的变化趋势;2)废弃混凝土细骨料或粗骨料可分别替代充填材料中30%~70%的细矸石或粗矸石;3)试验条件下矸石-废弃混凝土胶结充填材料合理配比为:废弃混凝土细骨料替代率、粗骨料替代率及水泥掺量分别为37%,49%,156 kg/m~3。
In order to solve the problem of insufficient raw material for filling and mining, the cementitious filling material is prepared by using waste concrete as aggregate. The influence of the fine aggregate and the coarse aggregate of the waste concrete on the flow properties and mechanical properties of the filling material was systematically studied. The addition proportion of the fine aggregate and the coarse aggregate in the filling material was determined. Finally, the response surface analysis The waste rock - abandoned concrete cemented filling material reasonable ratio. The results show that: 1) With the increase of the substitution rate of waste concrete, the expansion of filling material tends to increase, but the slump firstly decreases and then stabilizes. However, with the replacement rate of coarse aggregate of waste concrete and cement The content of slump and the degree of expansion of filler material decrease gradually, the compressive strength of filler material increases with the increase of cement content, and then increases with the substitution rate of aggregate of waste concrete first increases and then decreases 2) Waste concrete fine aggregate or coarse aggregate can replace 30% -70% fine gangue or coarse waste respectively in filling materials; 3) The ration of waste rock-abandoned concrete cement filling material under test conditions is: Disposal The fine aggregate replacement rate, coarse aggregate replacement rate and cement content were 37%, 49% and 156 kg / m3, respectively.