Experimental Study on Strength Development and Engineering Performance of Coal-Based Solid Waste Paste Filling Material

To explore the strength development characteristics and engineering performance of different coal-based solid waste filling materials cemented into body, coal gangue was used as coarse material, fly ash, desulfurization gypsum, gasification slag, furnace bottom slag fine cement a gelling agent. The uniaxial compressive (UCS) bleeding rate backfill (CBSWCB) were tested by an orthogonal experiment, influencing factors mechanical properties analyzed. multiple generalized linear model established, optimal material ratio determined. index CBSWCB with tested. results show following points: (1) concentration content gypsum had great influence on early CBSWCB, while little strength. (2) High concentration, high ash low can significantly improve are beneficial to later increase. (3) Under scheme, 1.6%, slump 16.6 cm, cohesion general, segregation resistance good, initial setting time 5.42 h, final 7 after curing for 8 h reached 0.24 MPa.