A kind of preparation method of grouting material

Abstract

A preparation method for a grouting material, wherein 80-12 parts of magnesium phosphate cement, 4-15 parts of an additive, 10-15 parts of an admixture and 50-100 parts of an aggregate are used as a grouting material; by means of reasonable proportional design, the amount of magnesium phosphate cement may be effectively reduced so that the powder content in the aggregate is controlled and costs are reduced. The grouting material is suitable for geological conditions in which engineering is complex, such as tunnel engineering, slope treatment engineering, mining engineering, and urban underground spaces, and the effect of the grouting material on surrounding rock reinforcement and anti-seepage and plugging in the geological conditions in which engineering is complex is improved.

Description

technical field [0001] The invention belongs to the technical field of grouting material preparation, in particular to a method for preparing grouting material. Background technique [0002] Grouting, also known as grouting, is to prepare certain materials into grout, inject it into the formation or cracks with grouting equipment to make it expand, gel or solidify, so as to achieve the purpose of reinforcing surrounding rock or preventing seepage and plugging. The flow process of grout is the result of the joint action of the grout and the injected medium. Because the engineering rock mass is under the complex hydrogeological conditions such as weak water seepage, the existing crack infiltration grouting materials and grouting theory are difficult to meet the actual engineering needs. The selection of grouting material (ie grout) is one of the key conditions for surrounding rock reinforcement and anti-leakage, especially for projects such as urban underground space, which ha...

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Problems solved by technology

The common ones are acrylamide, lignin, urea-formaldehyde resin, polyurethane resin and epoxy resin slurry, but their disadvantages are: low strength, no water resistance, poor durability, toxic itself, and harmful to the surrounding environment. It produces pollution and is more expensive; therefore, it is rarely used in general grouting reinforcement projects; the second is cement slurry, and currently widely used are cement single liquid, cement fly ash slurry, cement clay slurry and cement-water Glass double liquid, etc.; although this type of material has the advantages of abundant raw material sources, low price, and high strength of the specimen, it has long gelation time and is difficult to accurately control, high water separation rate, poor stability, and slow strength growth rate, etc. disadvantages, and there are phenomena such as easy grout leakage in large-pore formations and poor injectability in small-pore formations, and the quality of grouting is difficult to guarantee; especially for cement-water glass grout, the material has good groutability, high early strength, and It has the advantages of high calculus rate and low price, and it is one of the economical and practical grouting materials commonly used at present. However, the disadvantages of this grout are: large dry shrinkage of the calculus body, and rapid decline in strength in the later stage; curing in water for 28- After 90 days, the strength will drop significantly, and after half a year, it will crack and even disintegrate into powder, thus losing its use value; especially under the condition of drying and dehydration, the drying shrinkage and disintegration will be faster, so the slurry is generally limited to temporary It is used for strengthening anti-seepage and plugging of low-cost projects

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