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A kind of alcohol amine modified calcium silicate hydrate nano crystal nucleus early strength agent and preparation method thereof

A technology of calcium silicate hydrate and nanocrystals, which is applied in the field of building material admixtures, can solve the problems that the long-term dispersion stability of calcium silicate hydrate crystal nucleus suspension is difficult to be guaranteed, and achieve long-term dispersion stability, adsorption The effect of increasing the volume and enhancing the strength is remarkable

Active Publication Date: 2021-05-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when polycarboxylate superplasticizer is used alone, the long-term dispersion stability of calcium silicate hydrate crystal nucleus suspension is difficult to be guaranteed

Method used

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  • A kind of alcohol amine modified calcium silicate hydrate nano crystal nucleus early strength agent and preparation method thereof
  • A kind of alcohol amine modified calcium silicate hydrate nano crystal nucleus early strength agent and preparation method thereof

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preparation example Construction

[0021] The present invention also provides a preparation method of the alcohol amine modified calcium silicate hydrate nano crystal nucleus accelerator, comprising the following steps:

[0022] (1) adding the reaction stock solution dropwise to the reaction bottom solution, and stirring and reacting at a pH value of 10.5 to 13.5 and a reaction temperature of 5 to 60° C. to obtain a calcium silicate hydrate nanocrystal nucleus suspension;

[0023] (2) reacting the calcium silicate hydrate nano crystal nucleus suspension with the dispersion stabilization liquid to obtain the alcohol amine modified calcium silicate hydrate nano crystal nucleus early strength agent.

[0024] Before the reaction, cool the reaction stock solution and the reaction bottom liquid with an ice-water bath or heat them to 5-60°C in an oil bath, and the polycarboxylate water-reducer in the reaction bottom liquid needs to be fully dispersed and uniform. Therefore, the polycarboxylate The water reducer is sti...

Embodiment 1

[0034] Embodiment 1 of the present invention provides an alkanolamine-modified calcium silicate hydrate nanocrystal nucleus early strength agent, with a mass fraction of 5% calcium nitrate solution and a mass fraction of 8% sodium silicate solution as the reaction stock solution ; 4% polycarboxylate superplasticizer as the reaction bottom solution; 1% aluminum nitrate solution and 2% triisopropanolamine solution as the dispersion and stabilization liquid.

[0035] The alcohol amine modified calcium silicate hydrate nano crystal nucleus accelerator is prepared by the following method:

[0036] (1) Mix the calcium nitrate solution and the sodium silicate solution at a mass ratio of 1:1 to prepare the reaction stock solution, and use a laboratory precision peristaltic pump to slowly drop the reaction stock solution into the reaction bottom solution (polycarboxylate) at a flow rate of 2 mL / min. acid water reducer dispersion liquid), the mass ratio of the reaction stock solution an...

Embodiment 2

[0040] Embodiment 2 of the present invention provides an alcohol amine-modified hydrated calcium silicate nanocrystal nucleus early strength agent, with a mass fraction of 5% calcium nitrate solution and a mass fraction of 8% sodium silicate solution as the reaction stock solution ; 4% polycarboxylate superplasticizer as the reaction bottom solution; 1% aluminum nitrate solution and 2% triisopropanolamine solution as the dispersion and stabilization liquid.

[0041] The alcohol amine modified calcium silicate hydrate nano crystal nucleus accelerator is prepared by the following method:

[0042] (1) Mix the calcium nitrate solution and the sodium silicate solution at a mass ratio of 1:10 to prepare the reaction stock solution, and slowly drip the reaction stock solution into the reaction bottom solution (polycarboxylate) with a laboratory precision peristaltic pump at a flow rate of 2 mL / min. Acid water reducer dispersion liquid), the mass ratio of the reaction stock solution a...

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Abstract

The invention discloses an alcohol amine-modified calcium silicate hydrate nano crystal nucleus early strength agent, which is prepared from a reaction stock solution, a reaction bottom liquid and a dispersion stabilization liquid, and the reaction stock solution includes the following components: soluble calcium salt and Soluble silicon salt; the reaction bottom liquid includes the following components: polycarboxylate superplasticizer; the dispersion stabilization liquid includes the following components: soluble alkanolamine organic matter and soluble aluminum salt. The alcohol amine modified calcium silicate hydrate nano crystal nucleus early strength agent solves the problem of long-term dispersion stability of the calcium silicate hydrate crystal nucleus suspension, and its initial particle size is small, the dispersion stability time is long, and it is durable to storage. The preparation process and application method are simple, and the effect of improving the strength of cement-based materials in the early stage and later stage is remarkable, and the performance is excellent. The invention also discloses a preparation method of the alcohol amine modified calcium silicate hydrate nano crystal nucleus accelerator.

Description

technical field [0001] The invention belongs to the field of building material admixtures, and in particular relates to an alcohol amine-modified calcium silicate hydrate nano crystal nucleus accelerator and a preparation method thereof. Background technique [0002] my country has achieved rapid development in engineering construction, and the demand for building materials is increasing year by year. In addition, the requirements for the construction speed and quality of super high-rise buildings, long-span sea-crossing bridges, rail transit and high-speed railways are getting higher and higher, especially the early strength development and durability of concrete. . At the same time, with the rapid development of metallurgy, chemical industry, coal and electric power, and urban infrastructure construction in China, the amount of industrial solid waste and construction solid waste discharged in the production process is also increasing year by year. The discharge of these ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B103/12
CPCC04B40/0039C04B2103/12C04B22/00C04B24/2647C04B24/122C04B22/085
Inventor 王发洲邹府兵胡传林胡曙光沈坤杰陶永征张迈朱宏伟
Owner WUHAN UNIV OF TECH
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