Sprayed concrete for roadway

Abstract

The invention provides sprayed concrete for a roadway. The sprayed concrete is prepared from the following raw materials in parts by weight: 80-120 parts of cement, 40-60 parts of superfine aggregate, 80-100 parts of fine sand, 10-20 parts of fibers, 6-12 parts of rubber powder, 7-10 parts of nano aluminum oxide, 3-8 parts of polyacrylamide, 8-14 parts of an MK-1 reinforcing agent, 1.5-5 parts of a water reducing agent, 6-10 parts of a flame retardant and 10-18 parts of an accelerator. According to the invention, an inorganic-organic co-hybrid polymer dispersion group system is formed on the basis of the principle of an inorganic-organic ultrafine powder assembly, coating and dispersion system, so that moderate toughness and rigidity can be achieved, excellent guniting material indexes such as high adhesion, cracking resistance, impermeability, reinforcement and support and the like are achieved, and the concrete also has relatively strong toughness, ductility, heat insulation and shock absorption performance.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to shotcrete used for roadways. Background technique [0002] In order to ensure the unobstructed passage and safe production of the underground roadway, it is necessary to carry out mining follow-up support for the underground roadway. Generally, cement mortar and concrete are used to spray grout on the rock surface of the underground roadway. After the cement mortar is solidified, it can prevent rocks from collapsing and groundwater Infiltrate the alleyway. At present, the process technology of mixing cement spraying materials on site is adopted for mining roadways. This process is to transport cement, sand, stones, etc. into the mine, and dry mix cement spraying materials on site. This method has the following three obvious disadvantages: 1. . On-site mixing, the operator is not easy to control the ratio, and the strictness of the quality control of the spraying grout...

AI Technical Summary

Problems solved by technology

At present, the process technology of mixing cement spraying materials on site is adopted for mining roadways. This process is to transport cement, sand, stones, etc. into the mine, and dry mix cement spraying materials on site. This method has the following three obvious disadvantages: 1. .On-site mixing, it is difficult for the operator to control the ratio, and the strictness of the quality control of the spraying grout is poor

2. On-site mixing needs to occupy valuable tunnel space in the mine, pile up cement and sand and gravel, affect the tunnel section and transportation space, and easily block the tunnel and cause accident hazards

3. Dust from cement unloading, sand and gravel unloading, and mixing and loading dust in underground roadways will aggravate the pollution of mine roadway environment and seriously affect the health of workers

[0003] The currently used support mortar and concrete formulations for underground mine roadways lead to unstable quality, resulting in mine roadway rocks falling, local landslides, roadway water seepage and other accidents. The details are as follows: 1. The shotcrete materials have poor instantaneous adhesion and Because of the rigid nature of the sprayed material, it is easy to rebound after sprayed on the rock surface, resulting in more than 30 ground materials, resulting in a serious waste of sprayed material

2. The combination of shotcrete materials cannot achieve toughness and rigidity, and cannot have high adhesion, anti-cracking, waterproof and other characteristics at the same time

The thickness of the reinforced support is required to be large, and the time for the support to play its role will be slowed down, resulting in a serious waste of shotcrete materials

3. The combination of shotcrete material has high rigid components, and the material is brittle. After the shotcrete material is solidified, it will easily cause hidden dangers such as collapse of the support mortar with the geological movement of the underground roadway or the vibration of blasting during mining.

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