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A liquid alkali-free accelerator

A technology of quick-setting agent and liquid, applied in the field of quick-setting agent for building concrete, can solve the problem of limited stability period, and achieve the effect of promoting hydration degree, enhancing early and late strength, and promoting solubility

Active Publication Date: 2022-03-08
丰乐宝化学材料(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The supersaturated aluminum sulfate in the existing liquid alkali-free accelerator will produce various aluminum hydroxyl polynuclear complex ions through the hydrolysis reaction of aluminum ions, and finally form aluminum hydroxide precipitation, although some alkali-free accelerators have been added to stabilize agent, but with limited stability

Method used

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  • A liquid alkali-free accelerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] After adding 45% aluminum sulfate to 34.9% water, add 12% magnesium sulfate, 1.3% 3-hydroxy-3-carboxyglutaric acid, 5% N,N-diethylethanolamine, 1.2 % disodium edetate, stir with a mechanical stirring device and heat the mixture to 60°C until the mixture turns into a clear solution, then add 0.1% diethanol monoisopropanolamine, 0.5% thiosulfuric acid Sodium, stir well, and cool to room temperature.

Embodiment 2

[0029] After adding 47% aluminum sulfate to 30.3% water, add 12% magnesium sulfate, 1.4% 3-hydroxy-3-carboxyglutaric acid, 6% N,N-diethylethanolamine, 1.6 % disodium edetate, stir with a mechanical stirring device and heat the mixture to 60°C until the mixture turns into a clear solution, then add 0.2% diethanol monoisopropanolamine, 1.5% thiosulfuric acid Sodium, stir well, and cool to room temperature.

Embodiment 3

[0031] After adding 47% aluminum sulfate to 29.4% water, then add 12% magnesium sulfate, 1.4% 3-hydroxy-3-carboxyglutaric acid, 6% N,N-diethylethanolamine, 1.9 % disodium edetate, stir with a mechanical stirring device and heat the mixture to 60°C until the mixture turns into a clear solution, then add 0.3% diethanol monoisopropanolamine, 2.0% thiosulfuric acid Sodium, stir well, and cool to room temperature.

[0032] According to the JC477-2005 "Accelerators for Shotcrete" standard, the liquid alkali-free accelerators prepared in the above examples are mainly tested for the basic properties of the slurry setting time, mortar strength, and stability.

[0033] 1. Coagulation time of clean slurry

[0034] The test of the setting time of the clean slurry is based on the JC477-2005 "Accelerator for Shotcrete" standard. The cement used in the test is the benchmark cement (GB8076-2008) produced by Shandong Lucheng Cement Co., Ltd., and the amount of the accelerator is 7% of the cem...

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Abstract

The invention discloses a liquid alkali-free accelerator, which belongs to the field of concrete additives. The raw materials consisting of the following mass percentages are uniformly mixed to obtain a liquid alkali-free accelerator: aluminum sulfate 40%-50%, magnesium sulfate 10%-15%, 3-hydroxy-3-carboxyglutaric acid 0.5%-1.5%, N , N-diethylethanolamine 3%-8%, edetate disodium 1%-3%, diethanol monoisopropanolamine 0.1%-0.3%, sodium thiosulfate 0.5%-2%, the rest for water. For sprayed concrete, the dosage is generally 6%-8% of the cement mass. The quick-setting effect is good, and it has excellent early and late strength. At the same time, the quick-setting agent has long-term stability.

Description

technical field [0001] The invention belongs to the field of concrete additives, in particular to an accelerator for building concrete. Background technique [0002] Concrete quick-setting agent refers to the admixture that can make concrete set and harden quickly. After being mixed into concrete, it can make the concrete set in the initial setting within 2-5 minutes and the final setting in 5-10 minutes. The gypsum in the medium turns into sodium sulfate and loses its retarding effect, thus promoting C 3 A (tricalcium aluminate) hydrates rapidly and precipitates its hydration product crystals in the solution, causing the cement slurry to solidify rapidly. Commonly used accelerators are divided into alkali accelerators and non-alkali accelerators. Alkali accelerators are highly alkaline and may cause physical harm to front-line construction workers. Currently, they are rarely used. Alkali-free accelerators It is further divided into non-alkali quick-setting agent made of h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/142C04B24/04C04B24/122C04B24/12C04B22/14
Inventor 刘辉张彪郑小芳
Owner 丰乐宝化学材料(北京)有限公司