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A kind of alkali-free liquid accelerator based on synthetic polyaluminum sulfate

A technology of polymerizing aluminum sulfate and aluminum sulfate, applied in the field of concrete admixtures, can solve the problems of corroded skin, reduced strength of shotcrete, and high alkali content of accelerators, and achieves the effect of less skin erosion

Active Publication Date: 2018-05-18
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In the early stage of accelerator research, whether it is a powder accelerator or a liquid accelerator, the problem is that the alkali content of the accelerator is generally high
The high alkali content in the accelerator can easily cause the following problems: 1) Increase the risk of alkali-aggregate; 2) Corrosion of the skin if the pH is too high; 3) The strength of sprayed concrete is greatly reduced in the later stage

Method used

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  • A kind of alkali-free liquid accelerator based on synthetic polyaluminum sulfate
  • A kind of alkali-free liquid accelerator based on synthetic polyaluminum sulfate
  • A kind of alkali-free liquid accelerator based on synthetic polyaluminum sulfate

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preparation example Construction

[0041] A preparation method based on synthetic polyaluminum sulfate novel alkali-free liquid quick-setting agent, characterized in that: the preparation method based on synthetic polyaluminum sulfate novel alkali-free liquid quick-setting agent comprises the following steps:

[0042] A. Dissolve aluminum sulfate in water, heat to 60-80°C, and adjust to Al 2 (SO 4 ) 3 The solution concentration is 140-150g / L;

[0043] B. Prepare a solution of ammonia water and water at a ratio of 1:3, gradually add it to the aluminum sulfate solution, control the temperature at about 35-45°C and keep the stirring speed not lower than 150 rpm, and adjust the pH to 6.2-6.7 for titration End point, obtain active aluminum hydroxide gel;

[0044] C. Put the activated aluminum hydroxide in the container and let it stand for 1-2 hours, suck out the supernatant liquid by siphon, and continue to add water to dilute and wash, repeat this way 4-5 times to obtain activated aluminum hydroxide gel with go...

Embodiment 1

[0053] Take 90 parts of industrial-grade aluminum sulfate and add 240 parts of water, heat the water bath to 80°C and keep the stirring speed not lower than 150 rpm. After all the aluminum sulfate is dissolved in water, reduce the temperature to 35-45°C;

[0054] Make a solution of ammonia water and water at a ratio of 1:3, gradually add the ammonia solution to the aluminum sulfate solution, control the temperature at about 35-45°C and keep the stirring speed not lower than 150 rpm, and adjust the pH to 6.2-6.7 as Titrate the endpoint to obtain active aluminum hydroxide gel suspension;

[0055] Put the activated aluminum hydroxide in the container and let it stand for 1-2 hours, suck out the supernatant by siphon, and continue to add water to dilute and wash, repeat this way 4-5 times to obtain activated aluminum hydroxide gel with good performance. Filter the gel to obtain a filter cake, dry the filter cake at 80°C for 8 to 10 hours, and pass through a 80 μm sieve to obtain w...

Embodiment 2

[0058] Take 100 parts of industrial-grade aluminum sulfate and add 250 parts of water, heat the water bath to 80°C and keep the stirring speed not lower than 150 rpm. After all the aluminum sulfate is dissolved in water, reduce the temperature to 35-45°C;

[0059] Make a solution of ammonia water and water at a ratio of 1:3, gradually add the ammonia solution to the aluminum sulfate solution, control the temperature at about 35-45°C and keep the stirring speed not lower than 150 rpm, and adjust the pH to 6.2-6.7 as Titrate the endpoint to obtain active aluminum hydroxide gel suspension;

[0060] Put the activated aluminum hydroxide in the container and let it stand for 1-2 hours, suck out the supernatant by siphon, and continue to add water to dilute and wash, repeat this way 4-5 times to obtain activated aluminum hydroxide gel with good performance. Filter the gel to obtain a filter cake, dry the filter cake at 80°C for 8 to 10 hours, and pass through a 80 μm sieve to obtain ...

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Abstract

The invention discloses a method for synthesizing polyaluminum sulfate, and discloses a preparation method for an alkali-free liquid quick-setting agent based on synthesizing polyaluminum sulfate. The alkali-free quick-setting agent is prepared by neutralizing aluminum sulfate solution in ammonia water to obtain active aluminum hydroxide gel, and the active aluminum hydroxide is filtered, dried, and ground into powder, and then added to aluminum sulfate solution to obtain polyaluminum sulfate . The proportion of this alkali-free quick-setting agent is: 45%-55% of polyaluminum sulfate, 0-5% of inorganic acid, 0-2% of stabilizer, 0-2% of organic early strength agent, 0-2% of organic tackifier %, the balance is water. In the case of a low dosage of the accelerator, the setting time of cement and the strength of mortar can meet the requirements of JC 477-2005 first-class accelerator for sprayed concrete, and the accelerator is an alkali-free liquid accelerator that can Effectively avoid the adverse effects caused by excessive alkali content. The cement variety of the accelerator has good adaptability.

Description

technical field [0001] The invention belongs to the field of concrete admixtures. The invention relates to a preparation method of a novel alkali-free liquid quick-setting agent based on synthetic polyaluminum sulfate for shotcrete. Background technique [0002] Accelerator is an essential component in shotcrete, and the development of concrete accelerator began in the 1930s. In the early stage of development, accelerators are mainly powder accelerators. Powder accelerators are likely to cause dust pollution during dry spraying construction, pollute the environment, uneven concrete dispersion, and high energy consumption. The body of the personnel has a certain degree of injury. In the 1970s and 1980s, with the development of sprayed concrete wet spraying technology, liquid accelerators began to appear in the world. Liquid accelerators can effectively avoid dust pollution and uneven dispersion of concrete caused by powder accelerators. [0003] The common chemical main co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/16C04B103/12
Inventor 吕兴栋李北星杨华全董芸周世华石妍严建军陈霞李响王磊陈琴颉志强张建峰闫小虎高志扬张亮林育强杨梦卉
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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