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Hydrated calcium aluminosilicate nano crystalline nucleus early strength agent and preparation method thereof

A calcium aluminosilicate and nanocrystalline technology, which is applied in the direction of silicate and aluminum silicate, can solve the problems of poor compressive strength improvement, large particle size, and easy agglomeration, so as to improve early hydration and mechanical properties. Behavior, simple preparation process, effect of increasing particle size

Active Publication Date: 2020-07-31
WUHAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, propose a calcium aluminosilicate hydrate nanocrystal nucleus early strength agent and its preparation method, and solve the problem of using calcium and siliceous raw materials to prepare calcium silicate hydrate nanocrystals in the prior art The technical problems of large particle size, easy agglomeration, and poor effect on early compressive strength improvement of cement-based materials with large amounts of mineral admixtures exist during the nuclear process.

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  • Hydrated calcium aluminosilicate nano crystalline nucleus early strength agent and preparation method thereof
  • Hydrated calcium aluminosilicate nano crystalline nucleus early strength agent and preparation method thereof
  • Hydrated calcium aluminosilicate nano crystalline nucleus early strength agent and preparation method thereof

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preparation example Construction

[0013] The first aspect of the present invention provides a preparation method of calcium aluminosilicate hydrate nano crystal nucleus accelerator, comprising the following steps:

[0014] Add the aqueous solution of the calcium source, the aqueous solution of the silicon source and the aqueous solution of the aluminum source dropwise into the polycarboxylate water reducer dispersion liquid, adjust the pH to 10.0-13.5, and carry out the stirring reaction to obtain the calcium aluminosilicate hydrate nanocrystalline nucleus Early strengthening agent.

[0015] The applicant found that when synthesizing the calcium silicate hydrate nanocrystal nucleus, introducing a certain amount of aluminum salt can form an aluminum oxide tetrahedron as a bridging oxygen tetrahedron in the molecular structure of the calcium silicate hydrate, and promote the production of polycarboxylate superplasticizers. The adsorption capacity, thereby enhancing the steric hindrance of polycarboxylate superpl...

Embodiment 1

[0034] This embodiment provides a preparation method of calcium aluminosilicate hydrate nanocrystal nucleus accelerator, comprising the following steps:

[0035](1) Pre-configure 20ml of calcium nitrate solution with a molar concentration of 2mol / L, 20ml of a sodium silicate solution with a molar concentration of 2mol / L and 20ml of an aluminum nitrate solution with a molar concentration of 0.06mol / L, and place it at 20°C In the constant temperature water bath box, after the temperature is stabilized, it is ready for use; wherein, the calcium-silicon molar ratio is 1.0, and the aluminum-silicon molar ratio is 0.03;

[0036] (2) Configure 100ml of polycarboxylate superplasticizer dispersion with a mass fraction of 6.0%, and stir with a magnetic stirrer for 30min at a water bath temperature of 20°C;

[0037] (3) The above-mentioned polycarboxylate water-reducer dispersion is used as the bottom liquid, and the pH value is adjusted to 11.0 with a mass fraction of 30% sodium hydroxi...

Embodiment 2

[0039] This embodiment provides a preparation method of calcium aluminosilicate hydrate nanocrystal nucleus accelerator, comprising the following steps:

[0040] (1) Pre-configure 20ml of calcium nitrate solution with a molar concentration of 2mol / L, 20ml of a sodium silicate solution with a molar concentration of 2mol / L and 20ml of an aluminum nitrate solution with a molar concentration of 0.1mol / L, and place them at 40°C In the constant temperature water bath box, after the temperature is stabilized, it is ready for use; wherein, the calcium-silicon molar ratio is 1.0, and the aluminum-silicon molar ratio is 0.05;

[0041] (2) Configure 100ml of polycarboxylate superplasticizer dispersion with a mass fraction of 6.0%, and stir with a laboratory magnetic stirrer for 30min at a water bath temperature of 40°C;

[0042] (3) The above-mentioned polycarboxylate water-reducer dispersion is used as the bottom liquid, and the pH value is adjusted to 10.5 with a mass fraction of 30% s...

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Abstract

The invention discloses a hydrated calcium aluminosilicate nano crystalline nucleus early strength agent and a preparation method thereof. The preparation method comprises the following steps: dropwise adding an aqueous solution of a calcium source, an aqueous solution of a silicon source and an aqueous solution of an aluminum source into a polycarboxylate water reducer dispersion liquid, adjusting the pH value to 10.0-13.5, and carrying out reactions under stirring to obtain the hydrated calcium aluminosilicate nano crystalline nucleus early strength agent. The hydrated calcium aluminosilicate nano crystalline nucleus early strength agent is small in particle size and good in dispersion stability, can greatly improve early hydration and mechanical behaviors of a cement-based material, andhas a good application prospect. The preparation method of the hydrated calcium aluminosilicate nano crystalline nucleus early strength agent comprises the following steps: mixing an aqueous solutionof a calcium source, an aqueous solution of a silicon source and an aqueous solution of an aluminum source with a polycarboxylate water reducer according to a specific molar ratio under specific temperature and pH conditions and carrying out reactions under stirring. The preparation process is simple, subsequent processes such as washing, drying and ultrasonic dispersion are not needed, and the preparation method is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a calcium aluminosilicate hydrate nano crystal nucleus early strength agent and a preparation method thereof. Background technique [0002] Concrete products and prefabricated buildings have become an important means of implementation of many major projects in my country due to their advantages of refinement, modularization, and high efficiency. However, while concrete materials meet the needs of society for infrastructure construction, they also impose a huge load on the environment. At the same time, the stockpiles of solid waste discharged in metallurgy, chemical industry, coal, electric power, construction and other industries in China are also increasing year by year. These bulk solid wastes not only occupy a large amount of land resources, but also cause serious pollution to the environment and water bodies. In order to solve this problem, people use these bul...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B22/08C04B103/12
CPCC04B40/0039C04B22/0093C04B2103/12C04B24/2641C01B33/26C04B22/00863C04B2103/14C04B20/008C04B24/2647C01P2002/72C01P2002/86C01P2004/04C04B22/0086
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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