A high specific gravity and low consistency water dispersion resistant synchronous grouting material

Abstract

The invention discloses an anti-aqueous dispersion synchronous grouting material with large specific gravity and low consistence. The anti-aqueous dispersion synchronous grouting material consists of the following components in parts by weight: 100 parts of coal ash, 10-30 parts of slaked lime, 5-20 parts of cement, 10-50 parts of phosphorus gypsum, 0-200 parts of machine-made sand, 200-400 parts of shield mud and sand, 0.1-0.5 part of a water reducing agent, 0.05-0.2 part of a thickening agent and 80-120 parts of water. The shield mud and sand is used for replacing river sand and bentonite in a traditional grouting material, and the shield mud and sand and machine-made sand are taken as fine aggregates, so that the problem of resource shortage for natural sand is solved; moreover, the coal ash discharged at a power station and the phosphorus gypsum produced at a phosphorus chemical plant are reasonably utilized, so that the resource utilization of industrial waste is realized. The grouting material has the characteristics of good filling property, long castable time, large specific gravity, low consistence, anti-aqueous dispersion performance, segment floating prevention and the like, is prominent in environmental protection performance and low in cost, and can be widely applied to the shield segment grouting engineering and the like.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a large specific gravity and low consistency water-resistant dispersion synchronous grouting material and a preparation method thereof. Background technique [0002] Synchronous grouting is an important process in tunnel shield construction. It plays the role of "controlling the uplift of tunnel segments, reducing ground subsidence, and ensuring structural stability". It is an indispensable link in tunnel excavation. However, ordinary synchronous grouting materials are not easy to fill evenly around the segment, have poor water dispersion resistance, and are easy to segregate and delaminate under high-pressure water-rich conditions, which affect the injectability, strength and durability of the slurry, and are easy to flow. To the bottom of the segment, the vault of the segment is filled and floated up, and the surface settlement cannot be effectively controlled. [0003] Durin...

AI Technical Summary

Problems solved by technology

In recent years, in response to the needs of various infrastructures and the increasing scale of construction, the demand for concrete and mortar has increased sharply, and the amount of sand and gravel aggregates, which account for about 70% of the volume, has continued to grow. The existing natural sand resources are difficult to guarantee my country's infrastructure. the construction

The natural sand resources in many areas are nearly exhausted, and many places have begun to ban or limit the mining of natural sand. The contradiction between the supply and demand of engineering sand is becoming more and more serious. In some areas, there is even no natural sand available, which directly affects the progress of the project.

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