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Alkali-free liquid accelerator and preparation method thereof

A technology of accelerator and liquid, applied in the direction of aluminum sulfur compound, aluminum sulfate, etc., can solve the problems of low solid content of saturated solution, decrease of stability of accelerator, and decrease of concrete performance, so as to achieve high solid content and improve stability , good quick-setting effect

Active Publication Date: 2019-11-15
重庆腾治科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the limitation of the solubility of aluminum salts, the solid content of the prepared saturated solution is low, so the amount of aluminum salt solution required to meet the setting time requirements is relatively large. The amount of traditional alkali-free liquid accelerators is generally 8-14%, but The introduction of a large amount of sulfate ions will increase the content of ettringite in the hydration product, and the formation of ettringite will generate expansion stress, which will easily cause concrete cracking and reduce the performance of concrete; and because aluminum ions are hydrolyzed in water, The stability of the prepared quick-setting agent is reduced, which also restricts its application

Method used

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  • Alkali-free liquid accelerator and preparation method thereof
  • Alkali-free liquid accelerator and preparation method thereof
  • Alkali-free liquid accelerator and preparation method thereof

Examples

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preparation example 1

[0031] Preparation example 1: ①Dissolve anhydrous aluminum sulfate in water, heat it to 40°C, and prepare an aluminum sulfate solution with 20wt% aluminum sulfate; add NH2 dropwise to the 20wt% aluminum sulfate solution 3 10wt% ammonia water, keep stirring, adjust the pH to 6.5-6.7 as the titration end point, and obtain an aluminum hydroxide colloidal solution; after washing the prepared aluminum hydroxide colloidal solution with distilled water, place it at a temperature of 70°C, Drying for 6 hours to obtain dried aluminum hydroxide colloid; grinding the dried aluminum hydroxide colloid to obtain aluminum hydroxide colloid powder with a fineness of 100-400 mesh;

[0032] ② In parts by weight, take 30kg of the 20wt% aluminum sulfate solution in step ①, heat it up to 70°C, add 3kg of basic aluminum lactate to it, stir evenly, add 10kg of aluminum hydroxide colloidal powder, keep warm and stir for 1h After that, polyaluminum sulfate is obtained.

preparation example 2

[0033] Preparation example 2: ①Dissolve anhydrous aluminum sulfate in water, heat it to 45°C, and prepare an aluminum sulfate solution with 20wt% aluminum sulfate; add NH2 dropwise to the 20wt% aluminum sulfate solution 3 10wt% ammonia water, keep stirring, adjust the pH to 6.5-6.7 as the titration end point, and obtain an aluminum hydroxide colloidal solution; after washing the prepared aluminum hydroxide colloidal solution with distilled water, place it at a temperature of 75°C, Dry for 7 hours to obtain dry aluminum hydroxide colloid; grind the dried aluminum hydroxide colloid to obtain aluminum hydroxide colloid powder with a fineness of 100-400 mesh;

[0034] ② In parts by weight, take 30kg of the 20wt% aluminum sulfate solution in step ①, heat it up to 75°C, add 4kg of basic aluminum lactate to it, stir evenly and add 15kg of aluminum hydroxide colloidal powder, keep stirring for 1.5 After h, polyaluminum sulfate is obtained.

preparation example 3

[0035] Preparation example 3: ①Dissolve anhydrous aluminum sulfate in water, heat it to 50°C, and prepare an aluminum sulfate solution with 20wt% aluminum sulfate; add NH 3Ammonia water of 10wt%, heat preservation and stirring, adjust the pH to 6.5-6.7 as the titration end point to obtain an aluminum hydroxide colloidal solution; after washing the prepared aluminum hydroxide colloidal solution with distilled water, place it at a temperature of 80°C, Drying for 8 hours to obtain dried aluminum hydroxide colloid; grinding the dried aluminum hydroxide colloid to obtain aluminum hydroxide colloid powder with a fineness of 100-400 mesh;

[0036] ②In parts by weight, take 30kg of the 20wt% aluminum sulfate solution in step ①, heat it up to 80°C, add 5kg of basic aluminum lactate to it, stir evenly, add 20kg of aluminum hydroxide colloidal powder, keep stirring for 2h After that, polyaluminum sulfate is obtained.

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Abstract

The invention discloses an alkali-free liquid accelerator and a preparation method thereof, and relates to the technical field of concrete admixtures. The technical solution main point is that the alkali-free liquid accelerator comprises the following components in parts by weight: 45-55 parts of polyaluminium sulfate, 3-5 parts of an organic acid, 0.5-1 part of an inorganic acid, 2-4 parts of a stabilizer, 1-2 parts of an early strength agent, 1-2 parts of a thickener, and 40-50 parts of water. By combination of polyaluminium sulfate with the organic acid, the inorganic acid and the stabilizer, the prepared accelerator has the advantages of low blending amount, good quick-setting effects and low strength loss.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an alkali-free liquid quick-setting agent and a preparation method thereof. Background technique [0002] Accelerator refers to the admixture that can be mixed into concrete to make it harden quickly. According to its shape, it can be divided into solid and liquid. Liquid accelerator is mainly used in shotcrete and shotcrete. Commonly used liquid accelerators include Alkaline liquid accelerators and non-alkali liquid accelerators mainly composed of sodium silicate and sodium aluminate; due to the high alkali content of alkaline accelerators, it not only affects the health of construction workers, but also adds alkaline accelerators. After the coagulant is added, the later strength and impermeability durability of concrete will also decrease significantly. Therefore, alkali-free liquid accelerators that are safer in construction and have less impact on the later streng...

Claims

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Application Information

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IPC IPC(8): C04B24/38C01F7/74C04B103/12
CPCC01F7/74C04B40/0039C04B2103/12C04B22/148C04B24/04C04B24/121C04B24/122C04B24/2652C04B24/383C04B22/165C04B22/126C04B22/082
Inventor 王小清孙治平
Owner 重庆腾治科技有限公司
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