Light anti-aqueous dispersion grout

A water-resistant dispersion and slurry technology, applied in the field of grouting slurry, can solve the problems of poor water-resistant dispersion performance of slurry, adverse effects on ground buildings, large amount of slurry bleeding, etc., to reduce slurry bleeding, improve filling compactness, The effect of enhancing the anti-water dispersion performance

Active Publication Date: 2013-01-30
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The shortcomings of the traditional single-liquid grout are: the grout is much heavier than water, the grout has poor water dispersion resistance, and the grout has a large amount of bleeding; for these reasons, the grout is diluted by water during the grouting process, and segregation occurs. The solid particles in the slurry sink and squeeze the water to the top of the cave; at the same time, there is more bleeding during the coagulation and hardening of the slurry, and after the water dissipates, a large number of cavities will be formed on the top of the cave, which will cause more surface subsidence and affect the ground. Buildings are adversely affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A lightweight water-resistant dispersion grouting slurry. The slurry composition material is: cement, fly ash, silica fume, bentonite, expanded polystyrene, hydroxymethyl cellulose and water. The weight ratio of the components is 28.5% of cement, 25.9% of fly ash, 1.3% of silica fume, 5.2% of bentonite, 1.3% of expanded polystyrene, 0.3% of hydroxymethyl cellulose, and the remaining part is water.

[0021] The cement is ordinary Portland cement, grade 32.5 and above.

[0022] SiO in silica fume 2 As the main ingredient.

[0023] Fly ash is grade III fly ash, with an average particle size of 23μm, and the composition is SiO 2 , Al 2 O 3 , CaO mineral mainly.

[0024] The average particle size of bentonite is 22μm, and the bentonite contains CaO, MgO and SiO 2 Mainly.

[0025] Expanded polystyrene (EPS) is white spherical particles with a particle size of 1mm.

[0026] The preparation process of the slurry is as follows: first soak expanded polystyrene (EPS) in water for half a min...

Embodiment 2

[0028] A lightweight water-resistant dispersion grouting slurry. The slurry composition material is: cement, fly ash, silica fume, bentonite, expanded polystyrene, hydroxymethyl cellulose and water. The weight ratio of the components is: cement 27%, fly ash 26%, silica fume 1%, bentonite 4%, expanded polystyrene 1.5%, hydroxymethyl cellulose 0.35%, and the remainder is water.

[0029] The cement is ordinary Portland cement, grade 32.5 and above.

[0030] SiO in silica fume 2 As the main ingredient.

[0031] Fly ash is grade III fly ash, with an average particle size of 26μm, and the composition is SiO 2 , Al 2 O 3 , CaO mineral mainly.

[0032] The average particle size of bentonite is 25μm. The bentonite contains CaO, MgO and SiO 2 Mainly.

[0033] Expanded polystyrene (EPS) is white spherical particles with a particle size of 1mm.

[0034] The preparation process of the slurry is as follows: first soak expanded polystyrene (EPS) in water for half a minute, filter out the water to obta...

Embodiment 3

[0036] A lightweight water-resistant dispersion grouting slurry. The slurry composition material is: cement, fly ash, silica fume, bentonite, expanded polystyrene, hydroxymethyl cellulose and water. The weight ratio of the components is 29% cement, 24% fly ash, 2% silica fume, 6% bentonite, 1.2% expanded polystyrene, 0.25% hydroxymethyl cellulose, and the remainder is water.

[0037] The cement is ordinary Portland cement, grade 32.5 and above.

[0038] SiO in silica fume 2 As the main ingredient.

[0039] Fly ash is grade Ⅲ fly ash, average particle size is 28μm, and its composition is SiO 2 , Al 2 O 3 , CaO mineral mainly.

[0040] The average particle size of bentonite is 27μm, and the bentonite contains CaO, MgO and SiO 2 Mainly.

[0041] Expanded polystyrene (EPS) is white spherical particles with a particle size of 1mm.

[0042] The preparation process of the slurry is as follows: first soak expanded polystyrene (EPS) in water for half a minute, filter out the water to obtain EPS ...

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Abstract

The invention relates to light anti-aqueous dispersion grout, and the grout is prepared by the following materials by weight percent: 27 to 29 percent of cement, 24 to 26 percent of coal ash, 1 to 2 percent of silica fume, 4 to 6 percent of bentonite, 1 to 2 percent of light material, 0.1 to 0.5 percent of anti-aqueous dispersion agent and balance of water. The grout is light in weight, so that the grout firstly floats on the top of a cave in the grouting process, then gaps on other parts are filled, and the filling compactness of the top of the cave can be improved; and meanwhile, the anti-aqueous dispersion performance of the grout is enhanced, isolation and water bleeding of the grout can be reduced, the size of the grout after being solidified is also obviously reduced, the gaps are more compactly filled, and a good engineering effect is achieved.

Description

Technical field [0001] The invention relates to a grouting slurry for tunnels, in particular to a lightweight water-dispersion resistant grouting slurry. Background technique [0002] Shield construction method has the advantages of small impact on the surrounding environment, safety, fast construction progress, and less interference to urban operation, and has become the preferred method for urban tunnel construction. Shield tail grouting is an indispensable auxiliary method in shield construction. Shield grouting grout should have good workability, fluidity and not easy to segregate properties, should have a certain early strength after setting, low hardening shrinkage, and not pollute the environment. [0003] Shield tail grouting grout is generally divided into two categories: single-liquid slurry and double-liquid slurry: (1) Single-liquid slurry is mainly made by mixing fly ash, sand, cement, water, admixtures, etc. It can be divided into inert slurry and hard slurry. No or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 杨建辉陈自海
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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