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Method for in-situ growth of calcium silicate hydrate on surface of mineral admixture

A technology of mineral admixture and calcium silicate hydrate, which is applied in the direction of silicate, alkaline earth metal silicate, etc., to achieve the effect of improving dispersion uniformity, improving early strength and later strength, and good activity

Active Publication Date: 2018-07-24
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, there is no relevant report on the in-situ growth of calcium silicate hydrate on the surface of mineral admixtures.

Method used

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  • Method for in-situ growth of calcium silicate hydrate on surface of mineral admixture
  • Method for in-situ growth of calcium silicate hydrate on surface of mineral admixture

Examples

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Effect test

Embodiment 1

[0023] A method for in-situ growth of calcium silicate hydrate on the surface of a mineral admixture, comprising the following steps:

[0024] (1) Alkali erosion: first prepare 1000ml of sodium metasilicate nonahydrate aqueous solution with a silicon ion molar concentration of 0.1mol / L, then add 100g of fly ash to it, and stir for 6 hours to obtain a fly ash slurry;

[0025] (2) Chemical co-precipitation reaction: Continue to stir the fly ash slurry obtained in step (1), and prepare 1000ml of calcium acetate aqueous solution with a calcium ion molar concentration of 0.1mol / L, and then add the calcium acetate solution dropwise to the fly ash slurry , The dropping rate is 300ml / min. After the dropwise addition was completed, the stirring was continued for 60 min. Suction filtration and washing are then carried out until the pH value of the filtrate is less than 8. Finally, vacuum-dry at 60° C. to constant weight to obtain calcium silicate hydrate grown in situ on the surface o...

Embodiment 2

[0027] A method for in-situ growth of calcium silicate hydrate on the surface of a mineral admixture, comprising the following steps:

[0028] (1) Alkali erosion: first prepare 1000ml of sodium metasilicate pentahydrate aqueous solution with a silicon ion molar concentration of 0.25mol / L, and then

[0029] 100g of fly ash was added thereto, and stirred for 3 hours to obtain the fly ash slurry;

[0030] (2) Chemical co-precipitation reaction: continue to stir the fly ash slurry obtained in step (1), and prepare 1000ml of calcium ion friction

[0031] A calcium acetate aqueous solution with a concentration of 0.25mol / L is then added dropwise to the fly ash slurry at a rate of 100ml / min. After the dropwise addition was completed, the stirring was continued for 120 min. Suction filtration and washing are then carried out until the pH value of the filtrate is less than 8. Finally, vacuum-dry at 60° C. to constant weight to obtain calcium silicate hydrate grown in situ on the sur...

Embodiment 3

[0033] A method for in-situ growth of calcium silicate hydrate on the surface of a mineral admixture, comprising the following steps:

[0034] (1) Alkali erosion: first prepare 1000ml of sodium silicate aqueous solution with a silicon ion molar concentration of 0.5mol / L, and then

[0035] Add 100g of fly ash and stir for 3 hours to obtain the fly ash slurry;

[0036] (2) Chemical co-precipitation reaction: continue to stir the fly ash slurry obtained in step (1), and prepare 1000ml of calcium ion friction

[0037] A calcium acetate solution with a concentration of 0.5mol / L is added dropwise to the fly ash slurry at a rate of 100ml / min. After the dropwise addition was completed, the stirring was continued for 60 min. Suction filtration and washing are then carried out until the pH value of the filtrate is less than 8. Finally, vacuum-dry at 60° C. to constant weight to obtain calcium silicate hydrate grown in situ on the surface of fly ash.

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Abstract

The invention discloses a method for the in-situ growth of calcium silicate hydrate on the surface of a mineral admixture. The method comprises the following steps: (1) performing alkali erosion: preparing an aqueous solution of a silicon source, adding the mineral admixture to the aqueous solution, and stirring the mineral admixture and the aqueous solution for a period of time to obtain a mineral admixture slurry; and (2) performing a chemical co-precipitation reaction: dropwise adding a calcium source to the mineral admixture slurry obtained in step (1), stirring the calcium source and themineral admixture slurry for a period of time, and then performing suction filtration, washing and drying on the obtained slurry to obtain calcium silicate hydrate in situ grown on the surface of themineral admixture. The method improves the dispersion uniformity of the calcium silicate hydrate, reduces the particle size of the calcium silicate hydrate and improves the early activity of the mineral admixture. The calcium silicate hydrate in situ grown on the surface of the mineral admixture, prepared by the method, can significantly improve the early strength of a cement-based material and greatly improve the later performances of the cement-based material, and also can realize the large-admixing amount application of the mineral admixture by improving the admixing amount of the mineral admixture.

Description

Technical field: [0001] The invention belongs to the technical field of building material production, and in particular relates to a method for in-situ growth of calcium silicate hydrate on the surface of mineral admixtures. Background technique: [0002] Calcium silicate hydrate is the main product of cement hydration, and its incorporation into cement-based materials can provide nucleation sites for cement hydration, reduce the energy barrier of hydration product precipitation, and accelerate the hydration reaction, thereby Improve the early strength of cement-based materials. And the smaller the particle size of calcium silicate hydrate, the more obvious its early strength effect. At the same time, the fine calcium silicate hydrate particles can fill the pores in the cement-based material, thereby improving the compactness of the cement-based material, increasing its later strength and improving its durability. However, the smaller the particle size of calcium silicate ...

Claims

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Application Information

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IPC IPC(8): C04B20/02C04B22/08C01B33/24
CPCC01B33/24C01P2002/72C01P2004/03C04B20/023C04B22/08C04B18/08
Inventor 潘钢华周飞飞陆小军朱祥蒙海宁
Owner SOUTHEAST UNIV
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