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Environment-friendly low-resilience low-alkaline liquid setting accelerator and preparation method

A low-rebound, environmentally friendly technology, applied in the field of low-alkali liquid quick-setting agent for shotcrete and its preparation, can solve the problems of high price, high dosage, unfavorable promotion, etc., and achieves high adhesion and low rebound rate. Effect

Active Publication Date: 2016-11-23
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the pH of non-alkali liquid accelerator is between 2 and 4, it is less harmful to construction, but its high dosage and high price are not conducive to popularization

Method used

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  • Environment-friendly low-resilience low-alkaline liquid setting accelerator and preparation method
  • Environment-friendly low-resilience low-alkaline liquid setting accelerator and preparation method
  • Environment-friendly low-resilience low-alkaline liquid setting accelerator and preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0029] (1) Preparation of modified polyaluminum sulfate solution

[0030] Dissolve 20g of polyaluminum sulfate (35% by mass of aluminum oxide) in 30g of water to form an aqueous solution of polyaluminum sulfate, add it dropwise to the bottom material of 18g of nano-alumina and 32g of aqueous solution, and perform ultrasonic reaction for 100 minutes , the reaction temperature is 75° C., and a stable transparent solution of modified polyaluminum sulfate is obtained.

[0031] (2) Preparation of modified fluoride salt

[0032] Dissolve 30g of sodium fluoride in 70g of nano-silica dispersion, and stir for 2 hours under high-shear conditions, and the high-speed shear should be at 2000S -1 , to obtain modified sodium fluoride.

[0033] (3) Preparation of modified alcohol amine

[0034] A mixture of 40 g of diethanolamine, 50 g of polyethylene polyamine and 10 g of ethyl orthosilicate was placed in a constant temperature water bath at 50° C. for 2 hours to obtain a modified alcohol...

preparation Embodiment 2

[0042] (1) Preparation of modified polyaluminum sulfate solution

[0043] Dissolve 35g of polyaluminum sulfate (33% by mass of aluminum oxide) in 45g of water to form an aqueous solution of polyaluminum sulfate, add it dropwise to the base material of 10g of nano-alumina and 10g of aqueous solution, and perform ultrasonic reaction for 60 minutes , the reaction temperature is 80° C., and a stable transparent solution of modified polyaluminum sulfate is obtained.

[0044] (2) Preparation of modified fluoride salt

[0045] Dissolve 20g of sodium fluoroaluminate in 80g of nano-silica dispersion, and stir for 3 hours under high-shear conditions, and the high-speed shear should be at 4000S -1 , to obtain modified sodium fluoroaluminate.

[0046] (3) Preparation of modified alcohol amine

[0047]A mixture of 60 g of triethanolamine, 37 g of polyethylene polyamine and 3 g of N,N-methylenebisacrylamide was placed in a constant temperature water bath at 40° C. for 3 hours to obtain a...

preparation Embodiment 3

[0055] (1) Preparation of modified polyaluminum sulfate solution

[0056] Dissolve 25g of polyaluminum sulfate (30% by mass of aluminum oxide) in 40g of water to form an aqueous solution of polyaluminum sulfate, add it dropwise to the base material of 15g of nano-alumina and 20g of aqueous solution, and perform ultrasonic reaction for 120 minutes , the reaction temperature is 85° C., and a stable transparent solution of modified polyaluminum sulfate is obtained.

[0057] (2) Preparation of modified fluoride salt

[0058] Dissolve 10g of sodium fluorosilicate in 90g of nano-silica dispersion, stir for 3 hours under high-shear conditions, and the high-speed shear should be at 6000S -1 , to obtain modified sodium fluorosilicate.

[0059] (3) Preparation of modified alcohol amine

[0060] A mixture of 45 g of diethanol monoisopropanolamine, 50 g of polyethylene polyamine and 5 g of diethylenetriamine was placed in a constant temperature water bath at 20° C. for 3.5 hours to obt...

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Abstract

The invention discloses an environment-friendly low-resilience low-alkaline liquid setting accelerator and a preparation method thereof. The environment-friendly low-resilience low-alkaline liquid setting accelerator is prepared from, by mass, 50-60% of a modified polyaluminium sulfate solution, 1-5% of modified fluoride salt, 1-4% of modified alcohol amine, 1-3% of a dispersant and 30-42% of water. The preparation method specifically includes the following steps that 1, the a modified polyaluminium sulfate solution is prepared; 2, modified fluoride salt is prepared; 3, modified alcohol amine is prepared; 4, the dispersant and the balance water are added, stirring is carried out for 1-4 h at 40-70 DEG C, and the finished product is obtained. As for the total alkali amount of the prepared low-alkaline liquid setting accelerator, Na2O+K2O<3%, the pH ranges from 3 to 5, and harm to the skin is small; when applied to spraying concrete, the low-alkaline liquid setting accelerator guarantees construction safety and has the advantages of being low in resilience, capable of significantly improving later-stage strength and the like.

Description

technical field [0001] The invention relates to a low-alkali liquid quick-setting agent for shotcrete and a preparation method thereof, in particular to an environment-friendly low-resilience and low-alkali liquid quick-setting agent and a preparation method. Background technique [0002] Accelerator is an essential admixture component in shotcrete. Its main purpose is to accelerate the setting time of concrete mixture, reduce rebound, improve early strength, and meet the construction requirements of special projects. [0003] At present, most of the alkaline powder accelerators are used in our country, and its main components are sodium silicate, sodium aluminate and sodium carbonate. Although it can meet the index requirements of quick-setting concrete, it has many defects, such as a pH of 10-14, which is a strong alkaline substance, strong corrosion, a total alkali content higher than 8%, and poor cohesion of the slurry, resulting in spraying. The amount of rebound of co...

Claims

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Application Information

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IPC IPC(8): C04B24/12
CPCC04B40/0039C04B2103/12C04B22/142C04B22/126C04B24/122C04B2103/408
Inventor 仇影丁蓓甘杰忠姜海东郑春扬郭兆来
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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