High strength environment friendly sprayed concrete

A shotcrete and high-strength technology, which is applied in the field of concrete for underground support in coal mines, can solve problems such as high roadway renovation rate, hidden safety hazards, and high support costs, and achieve the effects of improving roadway appearance, ensuring safe production, and reducing morbidity

Inactive Publication Date: 2016-05-04
DATONG COAL MINE GRP
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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.

Method used

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Embodiment Construction

[0009] High-strength environmentally friendly sprayed concrete is composed of cementitious materials and accelerators. The mass percentage of accelerators is 5% of the cementitious materials; the cementitious materials are composed of the following raw materials in parts by mass: 32.5 silicic acid 9 parts of salt cement, 1 part of MK-1 reinforcing agent, 20 parts of machine-made sand; 20 parts of crushed stone.

[0010] During the specific implementation process, the MK-1 enhancer is produced by Jiaozuo Yukun Mining Co., Ltd.

[0011] The standard consistency water consumption (%) of 32.5 Portland cement is 27.0, the initial setting is 2h35min, the final setting is 4h10min, and the fineness is 3.0%; flexural strength (Mpa): 5.3 for 3 days, 8.5 for 28 days; compressive strength (Mpa): 21.8 in 3 days, 40.4 in 28 days; (Jiaozuo City Zhongwu Engineering Inspection Co., Ltd. cement inspection report, the inspection items of this batch of ordinary Portland cement are qualified accor...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00155C04B2111/00724C04B14/02C04B14/06
Inventor 冯月新李凯琦霍利杰杨智文张世锋闫日武纪润清岳帮富张学峰闫捷赵会会吕文凌樊靖尚雁文杨树新郭世伟
Owner DATONG COAL MINE GRP
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