High strength environment friendly sprayed concrete

Abstract

The invention relates to underground concrete for a coal mine, in particular to high strength environment friendly sprayed concrete, which solves the problems of safety loophole, higher roadway overhaul rate and high support cost of the existing shaft sprayed concrete. The high strength environment friendly sprayed concrete is prepared from a binding material and an accelerator which is 5% of mass percent of the binding material; the binding material is prepared from the following raw materials in parts by weight: 9 parts of 32.5 Portland cements, 1 part of MK-1 fortifier, 20 parts of machine-made sand, and 20 parts of detritus. The strength of the sprayed concrete can be obviously improved, sprayed disability and dust concentration can be reduced, morbidity of silicosis is reduced, surrounding rock deformation can be effectively controlled, roadway overhaul can be reduced, an underground roadway appearance is improved, safety production of a shaft is ensured, support cost is obviously reduced and economic benefits are obvious.

Description

technical field [0001] The invention relates to concrete for underground support of coal mines, in particular to a high-strength environment-friendly shotcrete. Background technique [0002] Shotcrete is a fast and effective reinforcement method that has evolved from roadway support technology to the reinforcement of above-ground structures. The support of underground roadways in coal mines is mostly shotcrete with anchor nets. Due to the influence of accelerators, the design marks of shotcrete are generally At the same time, due to factors such as lack of responsibility of the operators during spraying, irregular concrete mixing, improper operation methods of sprayers, and unqualified maintenance, the actual strength will drop by about 20%. [0003] Ordinary shotcrete with a strength of about 20MPa is basically suitable for shallow mines with low ground pressure, but due to high brittleness and weak cohesion, damage phenomena such as cracking, peeling, and de-blocking often...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a high-strength environment-friendly sprayed concrete in order to solve the problems of potential safety hazards, high roadway renovation rate and high support cost in the existing mine sprayed concrete.