Novel underground spray coating material and preparation method thereof

Abstract

The present invention discloses a novel underground spray coating material and a preparation method thereof, and belongs to the technical field of mine protection engineering. According to the present invention, a polymer cement base slurry comprises an additive, cement and water, wherein a ratio of the additive and the cement to the water is 1:1, and the additive comprises the following components, by weight, 50-65% of 425 cement, 15-23% of an acrylic acid powder material, 5-8% of gypsum powder, 3-6% of calcium carbonate, 2-4% of a high strength water reducing agent, 4-7% of an accelerated agent, and 1-2% of antifoaming agent. The preparation spray coating method comprises material preparing, stirring, spray coating and the like. According to the present invention, in the case of the same viscosity of the cement slurry, a spraying performance of the polymer cement base slurry is significantly improved; a bonding performance of the material and the surrounding rock is substantially improved; and compared to the ordinary cement slurry, a tensile bond strength of the cement base slurry is increased by about 100-300%, and a 14 d shear bond strength can be increased by 100-140%.

Description

Technical field [0001] The invention relates to a concrete material, in particular to concrete for mine support, and belongs to the technical field of mine protection engineering. Background technique [0002] At present, ordinary concrete and ordinary cement mortar are still commonly used in support and reinforcement in the field of mine construction, including two construction methods: dry spraying and wet spraying. Dry spraying is the main method of underground mine construction at present. The concrete mixture is mixed with high-pressure water at the outlet of the spray gun and then sprayed out. Due to the short wet release time of the mixture and high-pressure water and the fast spraying speed, it is too late for a large amount of dry cement. It is sprayed out immediately after wet release, resulting in high dust intensity on the construction site, harsh construction environment, high rebound rate of concrete, slow construction speed and high cost. Wet spraying can bet...

AI Technical Summary

Problems solved by technology

Dry spraying is the main method of underground mine construction at present. The concrete mixture is mixed with high-pressure water at the outlet of the spray gun and then sprayed out. Due to the short wet release time of the mixture and high-pressure water and the fast spraying speed, it is too late for a large amount of dry cement. Spray out immediately after wet release, resulting in high dust intensity on the construction site, harsh construction environment, high rebound rate of concrete, slow construction speed and high cost

Wet spraying can better solve the problem of dust energy, but due to the high consistency of the concrete mixture, it is very difficult to transport the slurry during spraying. At present, no better solution has been found in terms of equipment, so wet spraying is It has not been well used in mine construction

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