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Novel alkali-free liquid accelerator based on synthesis of polymeric aluminum sulfate

A technology of polyaluminum sulfate and quick-setting agent, applied in the field of concrete admixture, which can solve the problems of corroding the skin, reducing the strength of sprayed concrete, and high alkali content of the quick-setting agent, and achieves the effect of small skin erosion

Active Publication Date: 2016-01-27
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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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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  • Novel alkali-free liquid accelerator based on synthesis of polymeric aluminum sulfate
  • Novel alkali-free liquid accelerator based on synthesis of polymeric aluminum sulfate
  • Novel alkali-free liquid accelerator based on synthesis of polymeric aluminum sulfate

Examples

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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, grind it finely and pass it through an 80u...

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, grind it finely and pass it through an 80...

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Abstract

The invention discloses a polymeric aluminum sulfate synthesis method and discloses a preparation method of a novel alkali-free liquid accelerator based on synthesis of polymeric aluminum sulfate. According to the alkali-free accelerator, an aluminum sulfate solution is neutralized by ammonia water, active aluminum hydroxide gel is prepared, active aluminum hydroxide is filtered, dried and ground into powder, then the aluminum sulfate solution is added, and the polymeric aluminum sulfate is prepared. The alkali-free accelerator comprises, in percentage, 45%-55% of the polymeric aluminum sulfate, 0%-5% of inorganic acid, 0%-2% of a stabilizer, 0%-2% of an organic early strength agent, 0%-2% of an organic tackifier and the balance of water. The cement setting time and the colloidal mortar strength of the accelerator can meet the requirement of first-class accelerators for JC477-2005 sprayed concrete under the condition of the lower mixing amount, and meanwhile, the accelerator is an alkali-free liquid accelerator and can effectively avoid adverse effects caused by excessively high alkali content. The cement types of the accelerator have 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 Applications(China)
IPC IPC(8): C04B22/16C04B103/12
Inventor 吕兴栋李北星杨华全董芸严建军石妍闫小虎高志扬张建峰张亮
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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