Abstract: Soda residue, fly ash and sodium silicate solution were synthesized as grouting materials.Considering different solid mass ratios and curing conditions, temperature and shrinkage were observed while compressive strength and FTIR tests were conducted to explore the effect of each material and solidified mechanism of new slurry.Results show that Ca(OH)2 in soda residue and CaO in the fly ash have the exothermic reaction with sodium silicate solution.The early strength of slurry is dependent on hydrate calcium silicate gels from the reaction of CaCl2, Ca(OH)2 and CaSO4 with sodium silicate solution.7-50 d compressive strength increment is determined by aluminosilicate polymer gel generated by alkali-activated fly ash.FTIR results confirm the coexistence of C-S-H and N-A-S-H gel in this system.The properties of slurry are ensured well by raw materials on the shrinkage, mobility, segregation and stone rate.

Key words: soda residue;grouting material;mine-out region;compressive strength;FTIR;solidified mechanism