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Liquid alkali-free accelerator

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

Active Publication Date: 2020-07-24
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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  • 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, and belongs to the field of concrete additives. The liquid alkali-free setting accelerator is prepared by uniformly mixing the following raw materials in percentage by mass: 40%-50% of aluminum sulfate, 10%-15% of magnesium sulfate, 0.5%-1.5% of 3-hydroxy-3-carboxyl glutaric acid, 3%-8% of N, N-diethylethanolamine, 1%-3% of ethylenediaminetetraacetic acid disodium salt, 0.1%-0.3% of diethanolisopropanolamine, 0.5%-2% of sodium thiosulfate and the balance of water. The accelerator is used for spraying concrete, the mixing amount is generally 6%-8% of the mass of cement, the accelerating effect is good, excellent early strength and later strength are achieved, and meanwhile the accelerator 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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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
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