Composite additive for grouting material and grouting material

Abstract

The invention provides a composite additive for a grouting material and a grouting material. The composite additive comprises the following components in parts by weight: 1-3 parts of a polycarboxylate water reducer, 2-5 parts of bentonite, 2-4 parts of magnesium dihydrogen phosphate, 0.5-2 parts of polymeric aluminum sulfate, 2-6 parts of calcium sulfoaluminate, 0.5-1 part of cellulose ether and0.2-0.8 part of polyacrylonitrile fibers. The composite additive is added into cement slurry (especially silicate cement), so that the physical and mechanical properties of the cement slurry can be adjusted and changed, and effects of cement slurry such as rock surrounding, reinforcing, water intercepting, leakage stopping, geologic structure processing, and the like, are obviously improved.

Description

technical field [0001] The invention belongs to the field of grouting materials for medium and deep holes in coal mines, and relates to a composite additive for grouting materials and a grouting material. Background technique [0002] With the increase of mining depth in coal mines, the surrounding rock of the shaft and roadway presents obvious characteristics of soft rock deformation, and the sliding deformation of the surrounding rock becomes more and more intense, which makes the support of the shaft and roadway engineering more difficult. With the development of grouting technology, full-section grouting has become one of the effective and important means for surrounding rock reinforcement, water interception and leak plugging, and geological structure treatment projects. The grouting material is an indispensable part of the grouting technology. The reason why the grouting can play a reinforcing role is mainly due to the transformation of the grouting material from liqui...

AI Technical Summary

Problems solved by technology

But its disadvantages are: after the slurry is solidified, the strength is low, the durability is poor, the surrounding environment is polluted, the price is relatively expensive, and it is more or less toxic and flammable.

This type of material has the advantages of abundant raw material sources, low price, and high strength after curing, but there are disadvantages such as excessive curing shrinkage of the slurry and too long final setting time: excessive curing shrinkage requires multiple grouting during the grouting process In order to meet the engineering requirements; and the final setting time is too long will make the grouting work efficiency is extremely low, lengthen the grouting construction period

Due to the common shortcomings of granular materials such as long gel time and difficult to accurately control, high water separation rate, poor stability and slow strength growth rate, and easy to occur slurry leakage in large-pore formations and poor injectability in small-pore formations and other phenomena, the quality of grouting is difficult to guarantee

Especially cement-sodium silicate grout, which is one of the commonly used economical grouting materials because of its good injectability, high early strength, high stone rate and low price. The disadvantages are: the dry compression of the stone body is large, and the strength drops rapidly in the later stage; after 28-90 days of curing in water, the strength drops obviously, and after half a year, it cracks or even disintegrates into powder, thus losing its use value

[0007] CN108218359A discloses a cement-based high-performance micro-expansion filling grout, but the Portland cement grouting grout has a large water separation rate, poor stability, and a long setting time, and is not easy to pour into tiny cracks, pollutes the environment, consumes Drawbacks of large amounts of energy and resources, high cost, etc.

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