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Sulphoaluminate cement base synchronous slip casting material and preparation method

A technology of sulphoaluminate cement and synchronous grouting, which is applied in the field of civil construction materials, can solve the problems of material structure damage, loss of waterproof ability and bearing capacity, and low strength, so as to meet the requirements of grouting equipment and prevent ring vertical Seam leakage and convenient construction management

Inactive Publication Date: 2010-04-14
武汉市商品混凝土管理站
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low early strength of ordinary Portland cement-based grouting materials, the grouting materials are easily washed out by the water in the high-pressure water-rich formation, resulting in the destruction of the material structure, not only can not play the role of filling the formation. purpose, and will directly affect the stability of the segment lining structure
At the same time, the impermeability and water corrosion resistance of the grouting material decrease, causing it to lose its waterproof and bearing capacity prematurely, failing to achieve the purpose of backing grouting for shield tunneling

Method used

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  • Sulphoaluminate cement base synchronous slip casting material and preparation method
  • Sulphoaluminate cement base synchronous slip casting material and preparation method
  • Sulphoaluminate cement base synchronous slip casting material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A method for preparing a sulphoaluminate cement-based synchronous grouting material, comprising the steps of:

[0022] 1) Raw material selection: the ratio of each component (kg / m 3 ) is: sulfoaluminate cement: 100, fly ash: 380, mineral powder: 144, sand: 1200, water: 436, polycarboxylate superplasticizer: 3.74, sodium bentonite: 60, triethanolamine early agent : 0.13; select sulfoaluminate cement, fly ash, mineral powder, sand, water, polycarboxylate high-efficiency water reducer, sodium bentonite, triethanolamine early stage agent, spare;

[0023] The specific surface area of ​​the sulphoaluminate cement is greater than 350m 2 / kg; said fly ash is Class II fly ash or Class III fly ash with a density of 2.6-2.8g / cm 3 , the specific surface area is greater than 400cm 2 / g; the fineness modulus of the sand is 1.5-2.6; the specific surface area of ​​the mineral powder is greater than 450m 2 / kg; the water content of the sodium-based bentonite is <10%, and the finenes...

Embodiment 2

[0027] A method for preparing a sulphoaluminate cement-based synchronous grouting material, comprising the steps of:

[0028] 1) Raw material selection: the ratio of each component (kg / m 3 ) is: sulfoaluminate cement: 120, fly ash: 360, mineral powder: 120, sand: 1100, water: 420, polycarboxylate superplasticizer: 3.6, sodium bentonite: 55, triethanolamine early agent : 0.10; select sulfoaluminate cement, fly ash, mineral powder, sand, water, polycarboxylate superplasticizer, sodium bentonite, triethanolamine early stage agent, and reserve;

[0029] The specific surface area of ​​the sulphoaluminate cement is greater than 350m 2 / kg; said fly ash is Class II fly ash or Class III fly ash with a density of 2.6-2.8g / cm 3 , the specific surface area is greater than 400cm 2 / g; the fineness modulus of the sand is 1.5-2.6; the specific surface area of ​​the mineral powder is greater than 450m 2 / kg; the water content of the sodium-based bentonite is <10%, and the fineness specif...

Embodiment 3

[0033] A method for preparing a sulphoaluminate cement-based synchronous grouting material, comprising the steps of:

[0034] 1) Raw material selection: the ratio of each component (kg / m 3 ) is: sulfoaluminate cement: 140, fly ash: 340, mineral powder: 96, sand: 1000, water: 403, polycarboxylate superplasticizer: 3.45, sodium bentonite: 50, triethanolamine early agent : 0.09; select sulfoaluminate cement, fly ash, mineral powder, sand, water, polycarboxylate superplasticizer, sodium bentonite, triethanolamine early stage agent, and reserve;

[0035] The specific surface area of ​​the sulphoaluminate cement is greater than 350m 2 / kg; said fly ash is Class II fly ash or Class III fly ash with a density of 2.6-2.8g / cm 3 , the specific surface area is greater than 400cm 2 / g; the fineness modulus of the sand is 1.5-2.6; the specific surface area of ​​the mineral powder is greater than 450m 2 / kg; the water content of the sodium-based bentonite is <10%, and the fineness specif...

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Abstract

The invention relates to a synchronous slip casting material and a preparation method for tunnels, in particular to a sulphoaluminate cement base synchronous slip casting material, which is characterized in that the sulphoaluminate cement base synchronous slip casting material is prepared by a basal body component and an externally-mixing component, wherein the basal body component comprises sulphoaluminate cement, coal ash, powdered ore, sand and water, the externally-mixing component comprises polycarboxylic acids highly-effective water reducing agent, sodium bentonite and triethanolamine early-strength admixture, the proportioning (kg / m3) of each component is that sulphoaluminate cement: 100-200, coal ash: 300-400, powdered ore: 45-455, sand: 700-1200, water: 350-500, polycarboxylic acids highly-effective water reducing agent: 3.0-4.0, sodium bentonite: 40-60, and triethanolamine early-strength admixture: 0.05-0.2. The synchronous slip casting material prepared by the method has the characteristics of excellent early-stage intensity, underwater non-dispersibility, permeability-resisting and corrosion resistance, and can be used in large-scale river-sea-crossing tunnels or underground engineering.

Description

technical field [0001] The invention belongs to civil construction materials, and in particular relates to a synchronous grouting material for tunnels and a preparation method thereof. Background technique [0002] The shield tunneling method is the main construction method used in crossing rivers and seas and subway tunnels. The synchronous grouting of the shield method is to fill the tunnel with materials with appropriate early and final strength into the gap at the tail of the shield while the shield is advancing, so as to effectively control the ground settlement, ensure the early stability of the segment lining, and Form the first line of defense for lining waterproofing. Large-scale cross-river and sea tunnels and urban subways generally have the characteristics of long tunnels, large pipe diameters, high cross-section water pressure, and complex hydrogeological conditions in the passage areas. and other performance put forward higher requirements. However, due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/36C04B24/26C04B18/08C04B18/12C04B14/06C04B111/70
CPCC04B2111/70C04B2111/00293C04B28/065C04B2111/74C04B2111/26C04B2111/00724Y02W30/91C04B14/02C04B14/06C04B14/104C04B18/08C04B24/122C04B24/2641C04B40/0028C04B2103/302
Inventor 彭波丁庆军田焜赵志强严超吴烈斌蔡明霞
Owner 武汉市商品混凝土管理站
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