Cement-base composite material for grouting treatment of water-rich fractured rocks and preparation process of cement-base composite material

Abstract

The invention relates to a cement-base composite material for grouting treatment of water-rich fractured rocks and a preparation process of the cement-base composite material. The cement-base composite material for grouting treatment of water-rich fractured rocks comprises, by mass, 69-77 parts of portland cement clinker, 23-31 parts of mineralizer and 0.34-1.55 parts of additive powder retarder. The mineralizer comprises, by mass, 75-79 parts of ground quartz, 6.8-7.6 parts of calcium chloride, 2.8-3.6 parts of lithium chloride, 1.9-2.4 parts of talcum powder, 2.0-2.5 parts of hydroxypropyl methyl cellulose, 2.1-2.6 parts of wollastonite powder, 0.6-0.9 part of titanium dioxide, 3.1-3.8 parts of sodium hexametaphosphate and 1.5-2.1 parts of super plasticizer. Since portland cement clinker and mineralizer are processed by the combined grinding technology, and specific surface area of the material is controlled to be larger than 500m2/kg and residue on sieves of 80 micrometers in a vacuum sieving process is controlled to be less than 8% respectively by the Blaine method and the vacuum sieving analysis method, uniform performance of the material is achieved. Condensation time of the material is controllable, the strength of the material is high in early stage and later period, volume expansion of the material is slight, retention of the material is over 91% on a condition of 30m/min flowing water, and accordingly, the material can be applied to grouting reinforcement treatment engineering of water-rich fractured rocks widely.

Description

technical field [0001] The invention belongs to the technical field of material science and relates to a cement-based composite material and a preparation process for grouting treatment of water-rich broken rock masses. Background technique [0002] The geological conditions faced by my country's underground engineering construction are becoming more and more complex. When tunnels, mine roadways, urban rail transit and other underground projects encounter unfavorable geological structures such as water-rich faults, large deformation of surrounding rocks, landslides, water gushing and other disasters are very easy to occur. Broken, poor self-supporting capacity, large water gushing area, large water gushing volume, not easy to block, etc. [0003] As an effective means of strengthening broken surrounding rock and sealing water gushing, grouting has been more and more widely used in underground engineering. But there is no grouting treatment material for water-rich broken rock...

AI Technical Summary

Problems solved by technology

However, there is currently no grouting treatment material for water-rich broken rock mass in the market

Ordinary cement materials have a long setting time, and it is difficult to retain them after being injected into water-rich fractured formations, and the volume of the slurry shrinks after hardening, making it difficult to block water gushing; quick-setting cement materials such as cement-water glass, sulfoaluminate cement, etc. are affected by groundwater The temperature is seriously affected, the grout is difficult to spread effectively, and the later strength is low or shrinkage occurs; some chemical grouts have the performance of not only strengthening the broken surrounding rock but also realizing water gushing sealing, but under the influence of factors such as groundwater temperature and salinity , the curing reaction rate is not easy to control, especially the late aging of organic materials is serious, and the material price is high, and some chemical grouts have certain toxicity, which limits the application of this type of grouting materials

In the application process of the above materials, the influence of the temperature gradient change of the water-rich fractured formation and the high temperature and high pressure conditions on the grouting materials are not fully considered, which often leads to unsatisfactory grouting effects

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