Ammonium salt organic amine early-strength non-alkaline accelerator and preparation method thereof

An organic amine and early-strength technology, which is applied in the field of ammonium salt organic amine early-strength non-alkaline accelerator and its preparation, and the field of wet-mix shotcrete for tunnel engineering, can solve the problem of unfavorable durability and early strength of concrete. Insufficient, skin corrosion damage and other problems, to achieve the effect of shortening the initial setting time, high early strength, shortening the setting time

Inactive Publication Date: 2020-01-17
绵阳市安州区荣盛建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the main components of traditional accelerators are alumina clinker, sodium aluminate, carbonate, sodium silicate and other inorganic salts. Although this accelerator can basically meet the engineering requirements for setting time and early strength requirements, but this quick-setting agent is strongly alkaline, and the pH value of ordinary products is greater than 11, and the strength loss in the later period is large. The presence of strong alkali, sodium and potassium ions can easily cause alkali-aggregate reaction, which is detrimental to the durability of concrete
The existing non-alkaline accelerator generally has the problem of insufficient early strength in the construction process of shotcrete

Method used

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  • Ammonium salt organic amine early-strength non-alkaline accelerator and preparation method thereof

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Embodiment 1

[0029] A kind of ammonium salt organic amine early-strength type non-alkaline quick-setting agent, is 20% hydrofluoric acid 10g, aluminum hydroxide 7g, triethanolamine 0.25g, two 0.25g of ethanolamine, 40g of aluminum sulfate, 18g of sodium sulfate, 3g of aqueous sodium hydroxide solution with a mass fraction of 30%, 1g of ammonium nitrate, 0.2g of copper sulfate, and 0.3g of polyacrylamide.

[0030] The specific method for preparing the ammonium salt organic amine early-strength non-alkaline accelerator is as follows: in a 500ml three-necked or four-necked flask equipped with stirring, heating and cooling devices, add 20g of water and 20% hydrofluoric acid in sequence Add 10g of acid, 7g of aluminum hydroxide, stir and observe the temperature rise. After 10 minutes, raise the temperature to 65-80°C. After stirring for 20 minutes, add 0.25g of triethanolamine and 0.25g of diethanolamine. After 10 minutes, add 40g of aluminum sulfate and stir. After 30 minutes, adjust the tempe...

Embodiment 2

[0033] An ammonium salt organic amine early-strength type non-alkaline quick-setting agent consists of 16.51g of water, 12g of hydrofluoric acid, 8g of aluminum hydroxide, 0.6g of triethanolamine, 38g of aluminum sulfate, 19g of sodium sulfate, It is prepared by mixing 4 g of sodium hydroxide aqueous solution with a mass fraction of 30%, 1.3 g of ammonium nitrate, 0.3 g of copper sulfate, and 0.29 g of polyacrylamide.

[0034] The specific method for preparing the ammonium salt organic amine early-strength non-alkaline quick-setting agent is: in a 500ml three-necked or four-necked flask equipped with stirring, heating and cooling devices, add 12g of hydrofluoric acid with a mass fraction of 20% successively, Stir and add 8g of aluminum hydroxide, raise the temperature to 65-80°C, add 0.6g of triethanolamine after stirring for 20 minutes, add 38g of aluminum sulfate after stirring for 10 minutes, stir for 30 minutes and adjust the temperature to 65-80°C, add 19g of sodium sulfat...

Embodiment 3

[0037] An ammonium salt organic amine early-strength type non-alkaline quick-setting agent consists of 19.86g of water, 14g of hydrofluoric acid, 9g of aluminum hydroxide, 0.7g of triethanolamine, 40g of aluminum sulfate, 10g of sodium sulfate, It is prepared by mixing 4.5 g of sodium hydroxide aqueous solution with a mass fraction of 30%, 1.4 g of ammonium nitrate, 0.3 g of copper sulfate, and 0.24 g of polyacrylamide.

[0038]Its preparation method is: in a 500ml three-necked or four-necked flask equipped with stirring, condensing and heating devices, add water and hydrofluoric acid in turn to the raw materials, then add aluminum hydroxide, stir for 20 minutes, add organic amine, and stir for 10 minutes Add sulfuric acid, after the aluminum sulfate is completely dissolved, add sodium sulfate, sodium hydroxide solution, ammonium nitrate, copper sulfate, and polyacrylamide in sequence. During stirring, control the temperature of the reactants at 50-90°C, stir for 30 minutes af...

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Abstract

The invention discloses an ammonium salt organic amine early-strength non-alkaline accelerator which is characterized by consisting of the following raw materials in percentage by mass: 10-25% of hydrofluoric acid, 7-15% of aluminum hydroxide, 0.5-2% of organic amine, 15-40% of aluminum sulfate, 8-20% of sodium sulfate, 3-8% of a sodium hydroxide solution, 1-30% of nitrate amine, 0.2-1% of coppersulfate, 0.1-0.3% of polyacrylamide and the balance of water. The preparation method comprises the following steps: grinding aluminum sulfate and sodium sulfate, and performing screening; and adding the raw materials in sequence to a reactor, controlling the reactant temperature to 50-90 DEG C, after addition, and performing stirring for 30-50 minutes, so as to obtain an organic amine reinforced early-strength non-alkaline accelerator. The ammonium salt organic amine early-strength non-alkaline accelerator prepared by the invention has a standard alkali content, high early-strength, high later-strength and moderate cost, and can be widely used in tunnel engineering and construction.

Description

technical field [0001] The invention belongs to concrete admixture and its preparation, and relates to an ammonium salt organic amine early-strength non-alkaline accelerator and a preparation method thereof. The ammonium salt organic amine early-strength non-alkaline accelerator is especially suitable for tunnels Constituent material of engineering wet-mix shotcrete. Background technique [0002] Shotcrete construction has good molding conditions, and has many advantages that ordinary formwork pouring concrete cannot match. Shotcrete is often used in high-speed rail, expressway tunnel initial support, walls, water diversion, lining of tunnel engineering or other structures, and protective layer of steel structures. Scope of application of the project. Accelerator is an important component material of sprayed concrete, which can significantly shorten the setting and hardening time of concrete slurry, increase the thickness of a sprayed layer, and shorten the time interval b...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B103/12
CPCC04B40/0039C04B2103/12C04B22/126C04B22/06C04B24/122C04B22/148C04B22/147C04B22/062C04B22/085C04B22/142C04B24/2652
Inventor 李昌荣王小红李浩
Owner 绵阳市安州区荣盛建材有限公司
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