Cement-free anti-water dispersion and anti-water corrosion synchronous grouting material and its preparation method

Abstract

The invention relates to a synchronous grouting material of shield tunneling and its preparation method. A cement-free anti-water dispersion and anti-water corrosion synchronous grouting material is mainly composed of the following components by weight ratio: 250-350kg / m<3> of phosphogypsum, 250-400kg / m<3> of fly ash, slag powder and steel slag powder, 25-40kg / m<3> of attapulgite clay, 1-1.4kg / m<3> of polyacrylamide, 2-2.8kg / m<3> of an aliphatic high efficiency water reducer, 800-1000kg / m<3> of river sand, and 200-400kg / m<3> of water. Specifically, for the sum of the weight of the fly ash, the slag powder and the steel slag powder, the fly ash accounts for 0.5-99%, the slag powder accounts for 0.5-99%, and the steel slag powder accounts for 0.5-99%. Mixing and stirring of the materials can obtain the required synchronous grouting material, which has the characteristics of anti-water dispersion, anti-water corrosion, good fluidity, good construction performance, no pipe blockage, long usable time, and fast increase of later strength.

Description

technical field [0001] The invention belongs to the category of inorganic non-metal building materials, and in particular relates to a synchronous grouting material for shield tunnels and a preparation method thereof. technical background [0002] Underground projects such as subways and tunnels are increasing with the rapid development of the national economy, and the development of shield tunnel construction technology is also extremely rapid. Synchronous grouting materials, as a key technology in shield tunnel construction, have been paid more and more attention . The current synchronous grouting materials mainly have the following disadvantages: [0003] 1. The grouting material is easy to be eroded by water, and the grout is easily segregated by the washing of the water flow, and the water dispersion resistance is not good; the grout is caused by holes and voids to cause Ca 2+ Dissolved by water, the resistance to water corrosion is not good. [0004] 2. The construc...

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Problems solved by technology

[0004] 2. The construction performance of grouting materials is difficult to control. The slurry with high water content and good fluidity is easy to separate and separate. Float up, seriously affect the construction quality

[0005] 3. The usable time is short. The setting time of general grouting materials is about 5 hours. When the tunnel pipeline is too long or other special circumstances cause the grout to be poured immediately, the traditional grout will condense and lose its usability after being placed for a period of time, resulting in the abandonment of the grout , resulting in waste of materials and delays in construction

The discarding method is generally adopted, and the purchased land is piled up and landfilled, which not only increases the burden on enterprises, but also causes a second pollution of water sources, air, and land

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