Foam concrete for wet-spraying support of coal mine and preparation method thereof

Abstract

The invention relates to foam concrete for wet-spraying support of a coal mine and a preparation method. The foam concrete comprises a cementing material, water, an admixture and a foaming agent, wherein the cementing material is prepared from cement and fly ash, and the admixture comprises glue, a water reducing agent, an accelerating agent, fiber and cellulose. The invention can produce the foam concrete which not only has light weight and the functions of fire resistance, crack resistance, dynamic pressure resistance and the like, but also has great viscosity, and is particularly suitable for concrete spraying support operation of the coal mines and underground works. The formula can overcome the shortcomings of high rebound degree, large dust, incapability of ensuring spraying strength and the like during construction of a dry spraying method; and the problems of too fast solidification, pipe blockage and the like of an existing wet spraying method are also solved.

Description

technical field [0001] The invention relates to a concrete, in particular to a foam concrete and a preparation method thereof. The concrete can be widely used in coal mine engineering wet spray support. Background technique [0002] The dry spraying method has always occupied a dominant position in the shaft construction, especially in the field of coal mines in my country. Due to the problems of low construction efficiency, high rebound rate, large dust, and unguaranteed spraying intensity in dry spraying technology, spraying can only be used as a weathering protection layer for rock formations, and cannot be used as an effective support method. In recent years, , with the progress and development of the concrete spraying process, the wet spraying process has gradually occupied a dominant position with its unique advantages, and has become a development trend, especially the development of wet-mix shotcrete technology, which greatly expands the use of sprayed concrete in T...

AI Technical Summary

Problems solved by technology

The structure has good impermeability, good airtightness and integrity, and can be used in gas displacement coalbed methane roadway wall sealing and anti-seepage in coal mines. It can be sprayed concrete, but there is no increase in the viscosity of foam concrete in this formula , plasticity and improve its dispersibility and raw materials, so the viscosity and injection uniformity are not enough, and the rebound rate cannot be guaranteed

[0006] However, due to the characteristics of foam concrete itself and the limitations of the current application industry, the existing foam concrete formulations generally have a low viscosity and cannot meet the requirements of coal mine wet spraying operations. The advanced foam concrete formula ensures that the slurry sprayed by the wet spraying machine adheres firmly to its surface and basically does not rebound

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