Controllable low-strength material based on shield slurry and regenerated sand powder as well as preparation method and application of controllable low-strength material

A reclaimed sand, low-strength technology, applied in cement production, climate sustainability, infrastructure engineering, etc., can solve the problems of increasing the difficulty of shield mud reuse, increasing the difficulty of reuse, improper handling of shield mud, etc. , achieving significant social and economic benefits, low strength requirements, and improved mechanical properties

Active Publication Date: 2022-03-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A large amount of shield mud with high water content will be produced during the shield tunneling process, and the usual disposal method is to carry out flocculation, pressure filtration and drying on it before re-processing. Utilization, there are problems such as expensive treatment cost and complicated treatment process, and after dehydration and drying, the mud is hardened and difficult to disperse evenly, which increases the difficulty of subsequent reuse
In addition, in the process of shield tunneling, in order to facilitate the tunneling operation of the shield machine in the ground, a large amount of chemical substances such as foaming agent, grease, mudstone dispersant, etc. are usually sprayed on the

Method used

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  • Controllable low-strength material based on shield slurry and regenerated sand powder as well as preparation method and application of controllable low-strength material
  • Controllable low-strength material based on shield slurry and regenerated sand powder as well as preparation method and application of controllable low-strength material
  • Controllable low-strength material based on shield slurry and regenerated sand powder as well as preparation method and application of controllable low-strength material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A controllable low-strength material based on shield mud and recycled sand powder, its composition is shown in the following table:

[0034] Table 1 Composition of a controllable low-strength material based on shield mud and recycled sand powder

[0035]

[0036] Note:

[0037] Compound recycled sand powder: It is made by crushing and screening waste red bricks, mortar and concrete;

[0038] Shield mud: The mud produced by earth pressure balance method shield engineering is made by flocculation and concentration.

[0039] The above-mentioned preparation method of the controllable low-strength material based on shield mud and recycled sand powder includes the following steps:

[0040] PO42.5 ordinary Portland cement, recycled sand powder with a particle size of 0.075mm to 0.30mm, recycled sand powder with a particle size of 0.30mm to 1.18mm, recycled sand powder with a particle size of 1.18mm to 4.75mm, shield mud and The water is mixed evenly, and the controllable...

Embodiment 2

[0042] A controllable low-strength material based on shield mud and recycled sand powder, its composition is shown in the following table:

[0043] Table 2 Composition of a controllable low-strength material based on shield mud and recycled sand powder

[0044]

[0045] Note:

[0046] Compound recycled sand powder: It is made by crushing and screening waste red bricks, mortar and concrete;

[0047] Shield mud: The mud produced by earth pressure balance method shield engineering is made by flocculation and concentration.

[0048] The above-mentioned preparation method of the controllable low-strength material based on shield mud and recycled sand powder includes the following steps:

[0049] PO42.5 ordinary Portland cement, recycled sand powder with a particle size of 0.075mm to 0.30mm, recycled sand powder with a particle size of 0.30mm to 1.18mm, recycled sand powder with a particle size of 1.18mm to 4.75mm, shield mud, Sodium lignosulfonate and water are evenly mixed t...

Embodiment 3

[0051] A controllable low-strength material based on shield mud and recycled sand powder, its composition is shown in the following table:

[0052] Table 3 Composition of a controllable low-strength material based on shield mud and recycled sand powder

[0053]

[0054] Note:

[0055] Compound recycled sand powder: It is made by crushing and screening waste red bricks, mortar and concrete;

[0056] Shield mud: The mud produced by earth pressure balance method shield engineering is made by flocculation and concentration.

[0057] The above-mentioned preparation method of the controllable low-strength material based on shield mud and recycled sand powder includes the following steps:

[0058]PO42.5 ordinary Portland cement, recycled sand powder with a particle size of 0.075mm to 0.30mm, recycled sand powder with a particle size of 0.30mm to 1.18mm, recycled sand powder with a particle size of 1.18mm to 4.75mm, shield mud, Sodium lignosulfonate and water are evenly mixed to...

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Abstract

The invention discloses a controllable low-strength material based on shield slurry and regenerated sand powder as well as a preparation method and application of the controllable low-strength material. The controllable low-strength material based on the shield slurry and the regenerated sand powder comprises a cementing material, compound regenerated sand powder, the shield slurry, a water reducing agent, a coagulant and water, wherein the compound regenerated sand powder is formed by compounding regenerated sand powder with the particle size of 0.075-0.30 mm, regenerated sand powder with the particle size of 0.30-1.18 mm and regenerated sand powder with the particle size of 1.18-4.75 mm. The preparation method of the controllable low-strength material comprises the following steps: uniformly mixing the cementing material, the compound regenerated sand powder, the shield slurry, the water reducing agent, the coagulant and the water. The controllable low-strength material is high in fluidity, high in stability and controllable in strength, bleeding is avoided while high fluidity is guaranteed, and the controllable low-strength material is simple in preparation process and low in cost and has remarkable social benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a controllable low-strength material based on shield mud and recycled sand powder, a preparation method and application thereof. Background technique [0002] A large amount of shield mud with high moisture content will be produced during shield tunneling. The usual disposal method is to reuse it after flocculation, pressure filtration and drying. There are problems such as high processing cost and complicated processing process. After dehydration and drying, the mud is hardened and difficult to disperse evenly, which increases the difficulty of subsequent reuse. In addition, in the process of shield tunneling, in order to facilitate the tunneling operation of the shield machine underground, a large amount of chemical substances such as foaming agent, grease, mudstone dispersant, etc. are usually sprayed on the shield machine disk, which further It increases the diffi...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/16C04B7/24E01C3/00E02D17/12
CPCC04B28/04C04B7/246C04B18/16E02D17/12E01C3/00C04B2111/00017C04B2201/50C04B18/0418C04B2103/302C04B2103/12Y02P40/10Y02W30/91
Inventor 张同生王洪泰汪伟郭奕群韦江雄余其俊
Owner SOUTH CHINA UNIV OF TECH
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