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Experimental study and application of inorganic solidified foam filling material for coal mine

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Document pages: 13 pages

Abstract: Due to air leakage, the spontaneous combustion of residual coal in goaf poses a major risk to mining safety. The construction of sealing wall is an effective measure to control air leakage. A new type of inorganic curing foam filling material was developed and its physical and chemical properties were experimentally analyzed. The compressive strength of the material increases with the increase of the amount of sulphoaluminate cement. With the increase of water cement ratio, the initial setting time gradually prolongs, and the final setting time first shortens and then prolongs. The change trend of compressive strength is opposite. In addition, with the increase of foam expansion rate, the curing time tends to decrease, but the compressive strength remains unchanged. Withincrease in foam production, the solidification time increased and the compressive strength decreased exponentially. The results can be used to determine the optimal material ratios of inorganic solidified foam-filled material for coal mines, and filling technology for an airtight wall was designed. A field application of the new material demonstrated that it seals crossheadings tightly, leaves no fissures, suppresses air leakage to the gob, and narrows the width of the spontaneous combustion and heat accumulation zone.

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