Alkali-free fluorine-free liquid accelerator and preparation method thereof

An accelerator and liquid technology, applied in the field of concrete admixtures, can solve the problems of large dosage, low stability and poor coagulation effect, and achieve the effects of small skin erosion, good stability and no loss of strength in the later stage.

Active Publication Date: 2022-04-05
CHINA RAILWAY ERJU 4TH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is: for the non-alkali/low alkali liquid quick-setting agent that exists in the prior art, the coagulation accelerating effect is poor, the dosage is large, and the stability is low The technical defects of the non-alkali and fluorine-free liquid accelerator, through the composition design of the non-alkali and fluorine-free liquid accelerator, the synthesis and preparation of the liquid accelerator, the stability and adaptability c...

Method used

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  • Alkali-free fluorine-free liquid accelerator and preparation method thereof
  • Alkali-free fluorine-free liquid accelerator and preparation method thereof
  • Alkali-free fluorine-free liquid accelerator and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0054] Present embodiment 1 provides 6 groups of preferred liquid quick-setting agent formulation compositions, and composition total amount is 100%, and balance is water, as shown in table 2:

[0055] The proportioning ratio of each quick-setting agent of table 2

[0056]

[0057] The above-mentioned 6 groups of compositions were tested for the technical performance index requirements of the quick-setting agent, and the test object was the benchmark cement, and the dosage was 7%; the test results are shown in Table 3 below:

[0058] Table 3 Performance Test Summary

[0059]

Embodiment 2

[0061] This embodiment is the research optimization of the conditions in the preparation method of the quick-setting agent formula

[0062] The key point in the preparation and synthesis of liquid accelerators is to solve the solubility of accelerator components, especially for liquid accelerators that use aluminum-based compounds as accelerator components. Due to the low solubility of aluminum sulfate at room temperature, the purpose of synthetic process control is to promote the dissolution of aluminum sulfate and maintain the content of aluminum ions in the solution for a long time, so as to exert the effect of accelerator and meet the setting time and early strength technology Require. Therefore, choosing an appropriate synthesis process is the basic premise for preparing a qualified liquid accelerator.

[0063] Through the research on the reaction conditions, it is found that in addition to the ratio between the components of the compound product, the synergy between the...

Embodiment 3

[0076] A method for an alkali-free and fluorine-free liquid quick-setting agent, comprising the steps of:

[0077] Step 1: Heat the water to 40°C, put in half of the polyaluminum sulfate, and continue stirring at a speed of 140r / min for 8 minutes, continue to put in the remaining polyaluminum sulfate, and stir to dissolve;

[0078] Step 2: keep the temperature and rotational speed constant, dropwise add diethanolamine to carry out the complexation reaction for 12 minutes;

[0079] Step 3: Keep the temperature and rotation speed constant, add ethylene glycol dropwise for complexation reaction for 15 minutes;

[0080] Step 4: Keep the temperature and rotation speed constant, put in the remaining compound components and stir for 8 minutes, stop stirring, let the solution stand, and let the solution cool down to room temperature naturally to obtain the quick-setting agent #1, and control the total heat preservation Time 2h.

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Abstract

The invention belongs to the technical field of concrete admixtures, and particularly relates to an alkali-free fluorine-free liquid accelerator and a preparation method thereof. The accelerator is an alkali-free fluoride-free environment-friendly liquid accelerator which is formed by adding modified silicon dioxide, a defoaming agent and a dispersing agent into mother liquor of four components including polyaluminum sulfate, magnesium sulfate, diethanol amine and ethylene glycol in a matched manner, and preferably, the accelerator comprises 53-57% of polyaluminum sulfate and 4-6% of diethanol amine. 2-3% of magnesium sulfate; 1-2% of ethylene glycol; 2-4% of modified silicon dioxide, 0.2-1.5% of a defoaming agent and 2-6% of a dispersing agent; the total percentage is 100%. The accelerator is green, environment-friendly, pollution-free, simple to prepare, high in concrete early strength, small in later strength loss, good in stability and adaptability, economical, environment-friendly and the like.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to an alkali-free and fluorine-free liquid quick-setting agent and a preparation method thereof. Background technique [0002] In tunnel construction, the use of shotcrete to reinforce the surrounding rock is a common method. Shotcrete can be divided into wet spraying or dry spraying methods according to different construction methods. With the improvement of our country's requirements for shotcrete quality and working environment, dry shotcrete technology will be eliminated by wet shotcrete technology in the future, so the demand for high-quality liquid accelerators will also increase. [0003] Most of the liquid accelerators are alkaline accelerators. The traditional alkaline liquid accelerators are made of water glass (silicate) as the main component, and then potassium dichromate, triethanolamine, etc. are added. The alkali content of this type of quick-setting age...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B20/10C04B103/12
CPCY02W30/91
Inventor 李超李学友王林王莉肖平
Owner CHINA RAILWAY ERJU 4TH ENG
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