Lightweight low-temperature foamed mine filling material, preparation method and application thereof

Abstract

The application discloses a kind of light low-temperature foaming mine filling material and preparation and application thereof, by A, B component is formed according to mass ratio 1:1.A component includes fly ash, desulfurization gypsum, poly-N-isopropyl acrylamide (PNIPAM), basalt fiber, expanded perlite, foaming agent, auxiliary agent and water;B component includes sodium sulfate, water glass, tetramethylammonium hydroxide and water.By double-particle-size fly ash compounding and "water glass-sodium sulfate-tetramethylammonium hydroxide" ternary excitation system synergy, realize low-temperature rapid foaming curing, 1-day compressive strength ≥3.51MPa, 7 days ≥5.66MPa, dry density 0.40-0.50g / cm 3 , frost resistance coefficient ≥0.94, initial setting 36-41min, final setting 99-106min.The material has light weight, early strength, low cost, environmental protection, effectively solves the problem of traditional material low-temperature failure and strength deficiency, suitable for coal mine goaf low-temperature grouting filling.

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