Research on the performance of fly ash/coal gangue separation layer grouting filling materials
Li Xinwang1, Wu Rongyuan1, Li Lei1, Qi Yifei1, Cheng Lichao1, Li Li2
1. School of Mining Geomatics Engineering, Hebei University of Engineering, Handan 056038, China; 2. School of Civil Engineering, Hebei University of Engineering, Handan 056038, China
Addressing the challenges posed by the high demand and high cost of fly ash in layer separation grouting filler materials, a new fly ash/coal gangue layer separation grouting filler has been proposed, building on the existing fly ash filler. The study examines the impact of the physicochemical properties of coal gangue, the ratio of fly ash (80 ~ 109μm) to coal gangue (80 ~ 109μm) (referred to as the "fly-gangue ratio"), and the ratio of coal gangue (80 ~ 109μm) to fine coal gangue (less than 80μm) (referred to as the "large-gangue ratio") on the viscosity, fluidity, density, and water separation rate of layer separation grouting filler materials. The findings reveal that the physicochemical properties of coal gangue after ball milling are similar to those of fly ash. When the water-solid ratio is 1.2 and the fly-gangue ratio is 8:2, the viscosity, fluidity, water separation rate, and density of the filler material are 22.25s, 250mm, 3.4%, and 1.325g/cm3, respectively. When compared with the performance indicators of current fly ash filler materials, these variations are below 8.54%, indicating that this material can be used as a layer separation grouting filler.
