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Lignins metro shield grouting additive and its preparation method

A technology of subway shield and lignin, which is applied in the field of mortar admixture and its preparation, can solve the problems of easy segregation and layering, poor stability, etc., and achieve the effects of reducing pumping resistance, improving stability and improving stability.

Inactive Publication Date: 2008-07-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the patent of the present invention is to provide a preparation method of a lignin-based subway shield grouting admixture with lignosulfonate as the main raw material on the basis of the invention patent (ZL98116516.8), so as to solve the current shield grouting The problems of poor stability and easy segregation and stratification in the

Method used

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  • Lignins metro shield grouting additive and its preparation method
  • Lignins metro shield grouting additive and its preparation method
  • Lignins metro shield grouting additive and its preparation method

Examples

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Effect test

Embodiment 1

[0027] First, take 1000 grams of modified lignin sulfonate concrete superplasticizer produced by patented (ZL98116516.8) technology, dissolve it in 1500 grams of water, and heat up to 80°C while stirring. Add 50 grams of formaldehyde and react for 2 hours. Add 5 grams of rosin thermal polymer, 100 grams of calcium nitrate, 50 grams of sodium sulfate, and 20 parts of carboxymethylcellulose (the degree of crosslinking is 1000), and stir for 30 minutes. After cooling, a liquid product of the subway shield grouting admixture is obtained, and then spray-dried to obtain a solid dry powder.

Embodiment 2

[0029] First, take 1000 grams of modified lignin sulfonate concrete superplasticizer produced by patented (ZL98116516.8) technology, dissolve it in 1500 grams of water, and heat up to 90°C while stirring. Add 50 grams of melamine and react for 1.5h. Add 5 grams of lauryl sulfate, 200 grams of calcium formate, and 25 parts of carboxymethylcellulose (the degree of crosslinking is 800), and stir for 30 minutes. After cooling, a liquid product of the subway shield grouting admixture is obtained, and then spray-dried to obtain a solid dry powder.

Embodiment 3

[0031] First, take 1000 grams of modified lignin sulfonate concrete superplasticizer produced by patented (ZL98116516.8) technology, dissolve it in 1000 grams of water, and heat up to 80°C while stirring. Add 50 grams of ethylene glycol and react for 2 hours. Add 20 grams of turpentine soap, 200 grams of calcium acetate, and 10 parts of sodium polyacrylate (molecular weight is 1 million), and stir for 20 minutes. After cooling, a liquid product of the subway shield grouting admixture is obtained, and then spray-dried to obtain a solid dry powder.

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Abstract

The present invention relates to one kind of lignin admixture for subway shield grouting and its preparation process. The lignin admixture is prepared with modified lignin sulfonate proposed in patent ZL98116516.8 in 1000 weight portions, cross-linking agent in 20-200 weight portions, air entraining agent in 1-50 weight portions, inorganic salt reinforcer in 100-500 weight portions and water soluble polymer in 10-50 weight portions as material, and through condensation and physical re-compounding. The product of the present invention is used in subway shield grouting, has excellent water reducing reinforcing and stabilizing effect and makes the grout possess intermediate condensation time and less pumping resistance.

Description

technical field [0001] The invention relates to a mortar admixture and a preparation method thereof. Specifically, a lignin-based subway shield grouting admixture for subway shield grouting is prepared by using modified lignin sulfonate as a raw material. Background technique [0002] Subway has the advantages of large capacity, fast speed, and less pollution, and has become one of the main urban transportation tools. Subway tunnel construction technologies mainly include drill and blast method, open cut method and shield method. The shield tunneling method is relatively safe, has a high level of automation, and has little impact on ground buildings. It has become the main method of subway construction. [0003] In the process of tunnel excavation by the shield method, since the outer diameter of the shield machine is larger than that of the tunnel segment, 100-200mm is left between the lining segment and the natural soil layer (or rock layer) after the shield machine pass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/18
Inventor 邱学青楼宏铭杨东杰庞煜霞郑大锋
Owner SOUTH CHINA UNIV OF TECH
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