High-mixing-amount solid waste grouting material for mine limestone aquifer transformation and method

Abstract

The invention discloses a large-mixing-amount solid waste grouting material for mine limestone aquifer transformation and a method. The large-mixing-amount solid waste grouting material is prepared from, by mass, 30-60 parts of coal ash, 30-60 parts of coal gangue, 0-40 parts of slag ash, 0-30 parts of cement and 0-5 parts of sodium hydroxide. The method includes the steps of: performing grouting: mixing fly ash, coal gangue, slag ash, cement and sodium hydroxide according to a preset proportion, adding a certain amount of water, performing mixing, conducting stirring in a stirrer, and carrying out standing for molding; conducting drilling operation on the mine limestone aquifer through drilling equipment, conducting grouting after drilling is conducted to the bottom at a time, after grouting of the section at the bottommost end is completed, blocking the grouted section by a grouting stopping plug, and then starting a next section of grouting; and after drilling and grouting are completed, blocking cracks in a grouting mode. The material disclosed by the invention fully utilizes industrial wastes, can reduce the influence on the environment, is low in cost and easy to prepare, and has the beneficial effects of fully utilizing the existing solid wastes, saving energy, protecting the social environment and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a large-volume solid waste grouting material and method for reconstruction of limestone aquifers in mines. Background technique [0002] Mine water disaster control grouting and reinforcement grouting material consumption is very large, especially when the coal seam roof is grouted and reinforced, the general cement slurry solidifies for a long time, and it is not easy to stay in the cracks. The cement is expensive, not controllable and economical. [0003] At present, there are four types of grouting materials mainly used in mine water disaster control grouting reinforcement: [0004] (1) Fly ash-clay-cement slurry: At present, the filling effect of fly ash is mainly used, and fly ash accounts for the largest proportion, and it is widely used in China. The price of fly ash is lower than that of cement. In the process of filling and grouting, fly ash can replace cemen...

AI Technical Summary

Problems solved by technology

However, with the increase of the water-cement ratio, the fly ash-clay-cement slurry decreases in viscosity and strength, so it is not suitable for reinforcement grouting that requires a certain strength.

[0005] (2) Clay cement slurry: Clay is easy to obtain and low in price. Clay cement slurry has been widely used in Henan and other regions. However, clay cement slurry has long solidification time, poor controllability, and low strength, so it is not suitable for rapid plugging and injection. pulp

[0006] (3) Pure cement slurry: high usage rate, more common in the world, has the advantages of high gel strength, good gel durability, environmental protection and no pollution, but the price is still high

[0007] (4) Polymer slurry material: low gel strength, poor gel durability, easy to cause pollution; expensive, not a good choice for coal seam floor reinforcement projects with very large grouting volume

Images