High-performance alkali-free liquid accelerator and preparation method thereof

An accelerator and high-performance technology, which is applied in the field of high-performance alkali-free liquid accelerator and its preparation, can solve the problems of mechanical properties, large loss of durability, reduced synthesis reaction efficiency, and affecting the performance of accelerators, etc., to achieve Effects of improving early strength, improving stability, and improving cement adaptability

Active Publication Date: 2020-11-20
湖南加美乐素新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, two products of aluminum fluoride and silicon dioxide crystals are produced simultaneously, and silicon dioxide will adhere to the surface of aluminum hydroxide, thereby greatly reducing the synthesis reaction efficiency of the mother liquor and greatly affecting the performance of the accelerator.
The above two technical solutions not only have their own problems, but also do not solve the problems that the low-alkali quick-setting agent mainly based on aluminum salts has insufficient strength in the early stage of concrete, and the problems of large loss of mechanical properties and durability in the later stage, as well as the problem that the shotcrete is damaged due to sulfate radicals. Erosion dilation cracking problem

Method used

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  • High-performance alkali-free liquid accelerator and preparation method thereof
  • High-performance alkali-free liquid accelerator and preparation method thereof

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Embodiment 1

[0036] This embodiment includes the following steps:

[0037] (1) Preparation of activated aluminum hydroxide: take 1125g of aluminum nitrate nonahydrate aqueous solution as the bottom water and place it in a constant temperature water bath at 40°C for reaction, and simultaneously add 1140g of ammonia water (20%) and 40g of ethylenediaminetetraacetic acid disodium aqueous solution dropwise , Filtration, the resulting precipitate is activated aluminum hydroxide.

[0038] (2) Preparation of fluoroaluminum complex: Add 150.00g of 40% concentration hydrofluoric acid and bottom water into the reactor, turn on the stirring device, control the temperature of the reactor to 55°C, and then add 78.00g of hydrogen hydroxide in two Aluminum, heat preservation reaction for 2 hours to generate fluoroaluminum complex.

[0039] (3) Preparation of quick-setting agent: with 240.00g active aluminum hydroxide, 40.00g calcium fluoride, 25.00g triethanolamine, add in the fluoroaluminum complex rea...

Embodiment 2

[0043] This embodiment includes the following steps:

[0044] (1) Preparation of activated aluminum hydroxide: take 1125g of aluminum nitrate nonahydrate aqueous solution as the bottom water and place it in a constant temperature water bath at 40°C for reaction, and simultaneously add 1140g of ammonia water (20%) and 45g of disodium ethylenediaminetetraacetic acid aqueous solution dropwise , Filtration, the resulting precipitate is activated aluminum hydroxide.

[0045] (2) Preparation of fluoroaluminum complex: Add 175.00g of 40% concentration hydrofluoric acid and bottom water into the reactor, turn on the stirring device, control the temperature of the reactor to 60°C, and then add 78.00g of hydrogen hydroxide in two times Aluminum, heat preservation reaction for 3 hours to generate fluoro-aluminum complex.

[0046] (3) Preparation of quick-setting agent: 230.00g active aluminum hydroxide, 40.00g magnesium carbonate, 30.00g triisopropanolamine are added in the fluoroalumin...

Embodiment 3

[0050] The present embodiment comprises the following steps:

[0051] (1) Preparation of activated aluminum hydroxide: take 1140g of aluminum nitrate nonahydrate aqueous solution as the base water and place it in a constant temperature water bath at 40°C for reaction, and simultaneously add 1140g of ammonia water (20%) and 50g of disodium ethylenediaminetetraacetic acid aqueous solution dropwise , Filtration, the resulting precipitate is activated aluminum hydroxide.

[0052] (2) Preparation of fluoroaluminum complex: Add 150.00g of 40% concentration hydrofluoric acid and bottom water into the reactor, turn on the stirring device, control the temperature of the reactor to 60°C, and then add 75.00g of hydrogen hydroxide in two Aluminum, heat preservation reaction for 2.5 hours to generate fluoroaluminum complex.

[0053] (3) Preparation of quick-setting agent: With 235.00g active aluminum hydroxide, 35.00g magnesium sulfate, 30.00g diethanolamine, add in the fluoroaluminum com...

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Abstract

The invention relates to a high-performance alkali-free liquid accelerator and a preparation method thereof. The high-performance alkali-free liquid accelerator comprises the following components: 30-45% of active aluminum hydroxide, 3-15% of a fluorine-aluminum complex, 0.5-8% of an early strength coagulation accelerating component, 2-8% of an alcohol amine substance, 5-15% of a nano silica sol,0.5-2% of a dispersing agent and water. The high-performance alkali-free liquid accelerator disclosed by the invention can weaken adverse effects on later mechanical strength and durability of concrete while achieving a good accelerating effect, can effectively inhibit expansion cracking of the concrete, improves early strength and cement adaptability, and is low in dosage. The preparation methodis simple to operate and mild in condition.

Description

technical field [0001] The invention belongs to the technical field, and in particular relates to a high-performance alkali-free liquid quick-setting agent and a preparation method thereof. Background technique [0002] With the development of wet-mix shotcrete technology in recent years, the scope of application of shotcrete has been continuously expanded. Shotcrete is often used in coal mine shafts, railway tunnel repair and reinforcement, and highway slopes. The quick-setting agent is an admixture that makes the cement binder quickly set and harden, and is the key material for preparing shotcrete. It can significantly shorten the setting and hardening time of concrete slurry, reduce rebound, increase the thickness of one spray layer, shorten the time interval between two spray coats, improve the early strength of shotcrete and provide payment resistance in time; initial setting time, final setting time, 1d strength, 28d strength retention rate, etc. are important indicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B24/32C04B24/12C04B28/18C04B103/12C04B111/34
CPCC04B40/0039C04B28/18C04B2103/12C04B2111/343C04B14/062C04B22/06C04B22/126C04B24/122C04B24/287C04B22/002C04B22/10C04B24/32C04B22/142C04B14/042
Inventor 王伟周婷婷
Owner 湖南加美乐素新材料股份有限公司
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