Experimental Study on Ratio and Performance of Coal Gangue/Bottom Ash Geopolymer Double-Liquid Grouting Material

Abstract

Mine grouting reinforcement and water plugging projects often require large amounts of grouting materials. To reduce the carbon emission of grouting material production, improve the utilization of solid waste from mining enterprises, and meet the needs of mine reinforcement and seepage control, a double-liquid grouting material containing a high admixture of coal gangue powder/bottom ash geopolymer was studied. The setting time, fluid-ity, bleeding rate, and mechanical properties of grouting materials were studied through laboratory tests, and SEM analyzed the microstructure of the materials. The results show that the total mixture of calcined gangue does not exceed 60%. And the proportion of bottom ash replacing cement should be within 30%. At the same time, the volume mixture of sodium silicate is 20%. And the water-solid ratio does not exceed 0.6. The stability of the slurry prepared under this ratio is good. The microstructure of the stone body is dense, and its strength can meet the requirements of rock reinforcement and seepage control. Its economic and environmental benefits are more sig-nificant than the traditional cement-silicate double-liquid grouting material.