关键词: 钢渣基充填体, 抗压强度, 流变特性, 料浆浓度

Abstract: In view of the problem that cement as cementing material will increase the cost of backfill mining,steel slag, slag and quicklime are used as materials to conduct study on steel slag-based cementing materials,and the rheological properties of strength agent of steel slag-based backfill are analyzed in detail. The results show that slag content has a greater effect on the strength of backfill at 7 days than steel slag content,and steel slag content has a greater effect on the compressive strength of backfill at 28 days than slag content. With the increase of steel slag content,the compressive strength of the steel slag-based cemented backfill generally increases first and then decreases. When the steel slag content is 30%,the compressive strength of the backfill basically reaches the maximum value. Under the same content of cementing materials and slurry concentration,the 7 d and 28 d compressive strength of steel slag-based cemented backfill is significantly higher than that of cement based cemented backfill,which fully reflects that steel slag-based cemented backfill has better mechanical properties. With the increase of slurry concentration,the rheological parameters of steel slag-based filling slurry under different cement-sand ratios show an obvious trend of increase,but the change of cemented material content has no significant effect on the yield stress of steel slagbased filling material. Combined with the rheological test,it can be seen that the slurry concentration of steel slag-based backfill can be designed to be 62% ~ 64%,and the yield stress within this concentration range does not exceed 200 Pa,and the slurry shows good transportation performance.

Key words: steel slag-based cemented backfill,compressive strength,rheological properties,slurry concentration