Zhang J., He W., Ni W., Hu W., Chen J., 2016, Research on the Fluidity and Hydration Mechanism of Mine Backfilling Material Prepared in Steel Slag Gel System, Chemical Engineering Transactions, 51, 1039-1044.
This manuscript discussed the main factors influencing liquidity of mine backfilling material in the clinker-free steel slag cementitious system. The result of slurry fluidity experiment showed that addition of coal ash can improve the fluidity of system dramatically. The fluidity is improved as the coal ash concentration increases within a certain range, and the coal ash concentration of 15% maximized the liquidity to 220mm. The slag has less improvement on the slurry liquidity than coal ash, but can improve the compressive strength of the filling body at all stages. Tailings at appropriate grade of coarse and fine granule can help improve the liquidity to the maximum of 46.7%. The concentration of slurry exerts a tremendous influence on the liquidity and strength of the system. Filling slurry with the concentration of 73% has a good workability, and the maximum liquidity reaches to 240mm. The main hydration products are ettringite and hydrated calcium silicate gel. The acicular ettringite and gel could be interwoven with each other, strengthening the compactness of the filling body and equipping the system with sound hydraulic cementing performance.
