关键词: 碱渣;注浆材料;采空区;正交试验;性能

Abstract: In order to explore new utilization way of soda residue,soda residue-fly ash based grouting material,aiming at goaf filling,was developed.Orthogonal experiment was conducted to research the effect of the mass ratio of fly ash to soda residue(A),the ratio of liquid to solid(B)and the concentration of sodium silicate solution(C)on properties of slurry.And in order to optimize slurry,sodium silicate was partially replaced with gypsum based on the best mixture ratio.Results show that factor A has the greatest impact on initial setting time,factor C is the most significant factor for the final setting time and compressive strength,fluidity is mainly controlled by factor B and factor C,syneresis rate and solidification ratio are mainly depend on factor A and factor B;the change of gypsum substitution has significant influence on setting time,compressive strength and fluidity.The slurry has the best comprehensive performance when the mass ratio of fly ash,soda residue,sodium silicate,gypsum and water is 1:1:1.04:0.26:1.65,and meets the technical requirements of goaf filling project.

Key words: soda residue;grouting material;goaf;orthogonal test;property