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Ultra-fine cement slurry for reinforcing powder fine sand and preparation method thereof

A technology of ultra-fine cement and fine sand, applied in the field of grouting materials, to achieve the effect of fast penetration, overcoming poor durability and wide range

Active Publication Date: 2008-08-13
BEIJING MUNICIPAL ENG RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide an ultra-fine cement grouting material for strengthening silt fine sand and its preparation method, to solve the problem of using ultra-fine cement grout to quickly reinforce silty fine sand formations

Method used

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  • Ultra-fine cement slurry for reinforcing powder fine sand and preparation method thereof
  • Ultra-fine cement slurry for reinforcing powder fine sand and preparation method thereof
  • Ultra-fine cement slurry for reinforcing powder fine sand and preparation method thereof

Examples

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Effect test

Embodiment 1

[0045] Embodiment one: a kind of ultra-fine cement slurry for reinforcing silt fine sand of single slurry is characterized in that the following materials are stirred into mixed slurry according to the following proportions by weight:

[0046] (1), water: 100 parts. The water-cement weight ratio is 3:1-5:1.

[0047] (2), superfine cement: 20-40 parts. The specific surface area of ​​ultrafine cement is 7000~12000cm 2 / g.

[0048] (3) Suspending agent: 0.5 to 3 parts. Suspending agent is bentonite or silica powder. The suspending agent is preferably purified bentonite. There are many types of purified bentonite, and the best performance is purified bentonite with a montmorillonite content of more than 75%, and a pH value (2% dispersion) of 8 to 8.5. Silica powder is common industrial grade.

[0049] (4) Thinner: 0.5-2 parts. The above diluent is a copolymer of dimethyl vinyl propyl ammonium chloride and hydroxymethyl cellulose or sodium pyrophosphate. The copolymer of di...

Embodiment 2

[0059] Embodiment two: a kind of ultra-fine cement slurry for strengthening silt and fine sand of double slurry is different from embodiment one: there is also a second kind of quick-setting agent mixed slurry, and its quick-setting agent is water glass, water and hydrogen phosphate The mixture composed of disodium, the ratio of water glass, water and disodium hydrogen phosphate is a mass ratio of 100:100:8. The amount of the quick-setting agent mixed slurry is calculated by adding 20 to 40 parts of the quick-setting agent mixed slurry in the case of 100 parts by weight of water for the first superfine cement slurry for strengthening the silty sand.

[0060] The method for preparing ultra-fine cement slurry for strengthening silt and fine sand is characterized in that: first, water is added into the first mixing tank, and bentonite, diluent and high-efficiency water reducer are sequentially added under slow stirring, and after stirring for 2 minutes, the Slowly add ultra-fine ...

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Abstract

A superfine cement serum which is used by the reinforcing powder fine sand is mixed into the mixed serum according to the following weight parts ratio: water for 100 parts; superfine cement for 20-40 parts; suspension agent for 0.5-3 parts; thinning agent for 0.5-2 parts; high efficiency water reducing agent for 0.2-1 part, and the mixed serum can be mixed with surfactant for 0.5-1 part. Firstly the water is added into the mixing tank, along with the slow mixing the alta-mud, the thinning agent and the high efficiency water reducing agent are added in sequence, after mixing for two minutes the superfine cement is slowly added in the mixing state, then the mixture is mixed for five minutes at the rotary speed fro 500-1500 rounds / min. At the same time the second mixing tank can be added with water, sodium silicate and disodium hydrogen phosphate, and the accelerator serum is obtained after mixing for two minutes, the serum are abstracted from the two mixing tanks respectively with a double-liquid mud-injection pump, and the ratio of weight part of the two serum is 10:2-4. The serum of the invention settles the problem that the superfine cement serum is used for quickly reinforcing the powder fine sand earth.

Description

(1) Technical field [0001] The invention relates to a grouting material for formation reinforcement and a preparation method of the material. (2) Background technology [0002] Fine sand and silt fine sand layers are often encountered during tunnel construction. Such sand layers have poor self-stabilization ability, and engineering disasters such as water gushing, sand gushing, and landslides are very likely to occur during tunnel excavation. The most commonly used reinforcement methods for this stratum are the following: [0003] 1), acidic water glass grouting. This type of grouting material is currently the most widely used grouting material for fine sand. Its main material is water glass, and its auxiliary materials are sulfuric acid and sodium bicarbonate. This type of grouting material has a uniform grouting penetration range and low price, but its grouting reinforcement strength is low and its durability is poor. It can only be used in the case of low reinforcement...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B22/16
Inventor 叶英夏春蕾
Owner BEIJING MUNICIPAL ENG RES INST
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