Preparation method of calcium silicate hydrate early strength agent

The technology of calcium silicate hydrate and early strength agent is applied in the field of building material production, which can solve the problem of lack of utilization of acid-treated recycled aggregate waste liquid, and achieve the effects of reducing production cost and improving early strength and late strength.

Inactive Publication Date: 2018-02-23
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although there are related reports on the use of acid solution to soak recycled aggregates, there is a lack of relevant reports on the use of acid-treated recycled aggregate waste, let alone the use of acid-treated recycled aggregate waste to prepare silicon hydrate. Calcium Acid Calcium Source Report

Method used

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  • Preparation method of calcium silicate hydrate early strength agent
  • Preparation method of calcium silicate hydrate early strength agent
  • Preparation method of calcium silicate hydrate early strength agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of calcium silicate hydrate accelerator, comprising the following steps:

[0036] (1) Preparation of acid-treated regenerated aggregate waste liquid: soak 5 parts by weight of regenerated aggregate in 10 parts by weight of 0.5% acetic acid solution. After soaking for 24 hours, filter out the recycled aggregate, and filter out the impurities in the waste liquid. Then use ammonia water to adjust the pH value of the waste liquid to 12, and filter out the precipitate in the waste liquid. Then adjust the calcium ion concentration in the solution with tap water to obtain an acid-treated recycled aggregate waste liquid with a calcium ion molar concentration of 0.05 mol / L, and the recycled aggregate is obtained by crushing waste concrete blocks;

[0037] (2) Preparation of calcium silicate hydrate early-strength agent: While stirring, the acid-treated regenerated aggregate waste liquid obtained in step 1 is added at a speed of 500ml / min to a silicon ion mo...

Embodiment 2

[0039] A preparation method of calcium silicate hydrate accelerator, comprising the following steps:

[0040] (1) Preparation of acid-treated regenerated aggregate waste liquid: soak 5 parts by weight of regenerated aggregate in 10 parts by weight of an acetic acid solution with a mass concentration of 1.5%. After soaking for 24 hours, filter out the recycled aggregate, and filter out the impurities in the waste liquid. Then use ammonia water to adjust the pH value of the waste liquid to 12, and filter out the precipitate in the waste liquid. Then adjust the calcium ion concentration in the solution with tap water to obtain an acid-treated regenerated aggregate waste liquid with a calcium ion molar concentration of 0.15 mol / L, and the regenerated aggregate is obtained by crushing waste concrete blocks;

[0041] (2) Preparation of calcium silicate hydrate early-strength agent: While stirring, the acid-treated regenerated aggregate waste liquid obtained in step 1 is added at a ...

Embodiment 3

[0043] A preparation method of calcium silicate hydrate accelerator, comprising the following steps:

[0044] (1) Preparation of acid-treated regenerated aggregate waste liquid: soak 10 parts by weight of regenerated aggregate in 10 parts by weight of acetic acid solution with a mass concentration of 3%. After soaking for 24 hours, filter out the recycled aggregate, and filter out the impurities in the waste liquid. Then use ammonia water to adjust the pH value of the waste liquid to 12, and filter out the precipitate in the waste liquid. Then adjust the calcium ion concentration in the solution with tap water to obtain an acid-treated regenerated aggregate waste liquid with a calcium ion molar concentration of 0.25 mol / L, and the regenerated aggregate is obtained by crushing waste concrete blocks;

[0045](2) Preparation of calcium silicate hydrate early-strength agent: While stirring, the acid-treated regenerated aggregate waste liquid obtained in step 1 is added at a speed...

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Abstract

The invention discloses a preparation method of a calcium silicate hydrate early strength agent. The method comprises the following steps: (1) preparing an acid treatment recycled aggregate waste liquid, namely soaking recycled aggregates into an acid solution, filtering out a solid after a period of time, and treating the waste liquid to obtain the acid treatment recycled aggregate waste liquid,wherein the recycled aggregates are obtained by crushing waste concrete blocks; and (2) preparing the calcium silicate hydrate early strength agent, namely mixing the acid treatment recycled aggregatewaste liquid serving as a calcium source in the step (1) with a silicon source, carrying out stirring for a period of time, and then, carrying out suction filtration, washing and dispersion to obtainthe calcium silicate hydrate early strength agent. If the calcium silicate hydrate early strength agent is prepared by using the method, not only is the acid treatment recycled aggregate waste liquideffectively utilized, but also the cost of the calcium silicate hydrate early strength agent is reduced, the energy is saved, and the environment is protected. In addition, the early strength agent not only can improve the early strength of a cement-based material, but also can improve the later strength of the cement-based material.

Description

Technical field: [0001] The invention belongs to the technical field of building material production, and in particular relates to a preparation method of a calcium silicate hydrate early strength agent. Background technique: [0002] In the production process of precast concrete components, in order to speed up the turnover rate of molds and improve production efficiency, steam curing and adding early strength agents are often used to improve the early strength of concrete, so as to shorten the demoulding time of precast concrete components. As the main product of cement hydration, calcium silicate hydrate can be used as an early strength agent, which can provide nucleation sites for cement hydration, reduce the energy barrier of hydration product precipitation, and promote the crystallization reaction. Thereby increasing the cement hydration rate and promoting the strength development of cement-based materials. [0003] At present, the preparation methods of calcium silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/00C04B103/12
Inventor 潘钢华周飞飞陆小军朱祥蒙海宁
Owner SOUTHEAST UNIV
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