A kind of early strength agent for concrete prefabricated parts and preparation method thereof

A technology of concrete prefabricated parts and early strength agents, applied in the field of early strength agents, can solve problems such as poor storage stability, achieve good dispersion, improve stability, and reduce the effect of agglomeration

Active Publication Date: 2022-03-11
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing calcium silicate hydrate seed early strength agent suspension has good early strength effect but poor storage stability, the present invention provides a simple preparation method, good early strength effect, high solid content and good storage stability Accelerator for concrete prefabricated parts and preparation method thereof

Method used

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Examples

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preparation example Construction

[0040] The present invention also provides a kind of preparation method of early strength agent for prefabricated concrete, comprising:

[0041] Compound reaction of soluble calcium salt, soluble silicon salt, anionic dispersant, nonionic dispersant and thickener in aqueous solution to generate organic doped calcium silicate hydrate gel suspension, which is the early strong agent.

[0042] Specifically,

[0043] The soluble calcium salt, soluble silicon salt and thickener are respectively configured into aqueous solutions; wherein, the mass concentration of the soluble calcium salt solution is 50% to 70%, the mass concentration of the soluble silicon salt solution is 5% to 25%, and the thickener The mass concentration of the aqueous solution is 0.3% to 5%;

[0044] Add anionic dispersant, nonionic dispersant, thickener aqueous solution and water into the reaction vessel, set the preset reaction temperature and stirring rate; among them, the reaction vessel can be a three-nec...

Embodiment 1

[0049] The present invention provides a kind of preparation method of early strength agent for concrete prefabricated parts, comprising:

[0050] Weigh 50.0g calcium nitrate tetrahydrate and 50.0g water to make a 50.0% aqueous solution, weigh 15.0g sodium metasilicate and 85.0g water to make a 15.0% aqueous solution, weigh 1.0g Wenlun rubber and 99.0g water to make a into 1.0% aqueous solution;

[0051] Add 30.0g of anionic dispersant, 3.0g of nonionic dispersant, 3.0g of thickener solution and 58.0g of water in sequence in a 500ml three-necked flask, set the temperature at 60°C, and stir at 400rpm;

[0052] After stirring for 1 hour, add 84.6 g of calcium nitrate solution and 121.4 g of sodium silicate solution dropwise at the same time, keep stirring, and control the dropping speed so that the dropping time is 24 hours; strong agent.

Embodiment 2

[0054] The present invention provides a kind of preparation method of early strength agent for concrete prefabricated parts, comprising:

[0055] Weigh 66.0g calcium nitrate tetrahydrate and 34.0g water to configure a 66.0% aqueous solution, weigh 22.0g sodium metasilicate and 78.0g water to configure a 22.0% aqueous solution, weigh 1.0g Wenlun rubber and 99.0g water to configure into 1.0% aqueous solution;

[0056] Add 24.0g of anionic dispersant, 9.0g of nonionic dispersant, 3.0g of thickener solution and 142.9g of water in sequence in a 500ml three-necked flask, set the temperature at 40°C, and stir at 300rpm;

[0057]After stirring for 0.5h, add 75.1g of calcium nitrate solution and 46.0g of sodium silicate solution dropwise at the same time, keep stirring, and control the dropping speed so that the dropping time is 12h; continue stirring for 1h after dropping, and then slowly cool down to room temperature to obtain Early strengthening agent.

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Abstract

The invention discloses an early strength agent for concrete prefabricated parts and a preparation method thereof, comprising: soluble calcium salt, soluble silicon salt, anionic dispersant, nonionic dispersant, thickener and water; the preparation method is: soluble calcium salt , Soluble silicon salt, anionic dispersant, nonionic dispersant and thickener react compoundly in aqueous solution to generate organically doped calcium silicate hydrate gel suspension, which is the early strength agent for concrete prefabricated parts. The present invention uses anionic and nonionic composite dispersants to disperse calcium silicate hydrate gel particles, which can provide better dispersion; and add thickeners to early strength agents to reduce calcium silicate hydrate gel particles The aggregation between them further improves the stability.

Description

technical field [0001] The invention relates to the technical field of early strength agents, in particular to an early strength agent for concrete prefabricated parts and a preparation method thereof. Background technique [0002] Concrete has the advantages of low price, strong bearing capacity, and high durability. It is currently the most widely used building material in the world. With the extensive development of high-speed rail and subway construction in my country, prefabricated concrete has become an important development direction of my country's concrete industry, which puts forward higher requirements for the early strength of concrete and the time of form removal. Traditional chloride accelerators contain chloride ions, and sulfate inorganic accelerators contain alkali, so there are limitations in application, and it is urgent to develop new accelerators with excellent performance. [0003] Calcium silicate hydrate is the main product of cement hydration and pl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B103/14
CPCC04B40/0039C04B2103/14C04B22/085C04B12/04C04B24/24C04B24/28
Inventor 郑新国郁培云曾志胡建伟李书明董全霄刘竞程冠之潘永健蔡德钩贡照华姚建平楼梁伟石越峰谢永江朱长华董武黄安宁刘相会杨德军马国栋王永华刘文潘卫贾桂良崔政清孙景桐张永朝张也王钊
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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