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Alkali and chlorine free liquid setting accelerator

A quick-setting agent and liquid technology, applied in the field of building materials, can solve problems that affect the health of construction workers, damage to the internal structure of concrete, cracks or cracks on the surface of concrete, etc.

Inactive Publication Date: 2012-10-24
高永会
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the accelerators used in shotcrete produced in China are accelerators with high alkali content. The biggest disadvantages of this accelerator are: first, the durability and service life of concrete are reduced due to the incorporation of a large amount of alkali; The introduction of a large amount of alkali leads to a decrease in the 28d strength of the concrete in the later stage, and practice has proved that the decrease can reach 25-50%
In addition, because strong alkali is highly corrosive and has a pungent smell, it will seriously affect the personal health of construction workers and cause pollution to the environment
The second is that these quick-setting agents contain a large amount of Cl. The introduction of chloride ions has serious corrosion to the steel bars. Cavitation and erosion will destroy the internal structure of the concrete, resulting in cracks or cracks on the concrete surface, which will affect the durability and quality of the concrete. service life

Method used

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  • Alkali and chlorine free liquid setting accelerator
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  • Alkali and chlorine free liquid setting accelerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the percentage by weight, 3% of diethanolamine, 27% of water, 40% of aluminum sulfate and 10% of magnesium fluorosilicate are added into the mixing container, and fully mixed evenly under stirring. Then heated to 50°C and stirred to completely dissolve the solid. Turn off the heating source, add 20% polycarboxylate high-efficiency superplasticizer and mix evenly, and cool to normal temperature to obtain a high-performance alkali-free and chlorine-free liquid accelerator.

[0024] According to the JC477-2005 test method, the "Western House" brand OP42.5 ordinary Portland cement produced by Sichuan Yedong Cement Co., Ltd. was used. Add the alkali-free and chlorine-free liquid quick-setting agent prepared above by 4% of the cement weight. When the water-cement ratio is 0.4, the initial setting time is 2 minutes and 40 seconds, and the final setting time is 5 minutes and 53 seconds.

[0025] The prepared mortar is: sand: cement: water=3:2:1, the compressive s...

Embodiment 2

[0027] In percentage by weight, 5% of diethanolamine, 25% of water, 55% of aluminum sulfate and 10% of magnesium aluminum fluoride are added into the mixing container, and fully mixed evenly under stirring. Heat to 75°C with stirring to completely dissolve the same body. Turn off the heating source, add 5% polycarboxylate high-efficiency superplasticizer and mix evenly, and cool to normal temperature to obtain a high-performance non-alkali and chlorine-free liquid over-coagulant.

[0028] According to the JC477-2005 test method, the "Stone Forest" brand OP52.5 benchmark cement produced by Yunnan State-owned Dongjun Cement Co., Ltd. was used. Add the alkali-free and chlorine-free liquid quick-setting agent prepared above by 5% of the cement weight. When the water-cement ratio is 0.4, the initial setting time is 3 minutes and 37 seconds, and the final setting time is 8 minutes and 25 seconds.

[0029] The prepared mortar is: sand: cement: water=3:2:1, 24 hours compressive stre...

Embodiment 3

[0031] According to weight percentage, add 2% of diethanolamine, 20% of water, 60% of aluminum sulfate and 13% of sodium fluoride into the mixing container, and fully mix evenly under stirring. Heat to 90°C with stirring to completely dissolve the solid. Turn off the heating source, add 5% polycarboxylate high-efficiency superplasticizer and mix evenly, and cool to room temperature to obtain a high-performance and environmentally friendly alkali-free and chlorine-free liquid accelerator.

[0032] According to the JC477-2005 test method, the "Yu Wang" brand OP42.5 ordinary Portland cement produced by Shanxi Hejin Cement Co., Ltd. was used, and the alkali-free and chlorine-free liquid quick-setting agent prepared above was mixed with 3% of the cement weight. When the water-cement ratio is 0.38, the initial setting time is 3 minutes and 42 seconds, and the final setting time is 7 minutes and 44 seconds.

[0033] The prepared mortar is: sand: cement: water=3:2:1, the 24-hour comp...

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Abstract

The invention relates to an environment-friendly alkali and chlorine free liquid setting accelerator used for sprayed concrete. The setting accelerator is composed of the following components by weight: 25-60% of aluminum sulfate, 5-30% of a polycarboxylic acid salt, 0-5% of organic amine, 0-20% of a fluoride salt, and the balance water. The dosage of the setting accelerator doped into sprayed concrete accounts for 3-7 wt% of cement. The initial setting time is less than 4 minutes, and the final setting time is not more than 9 minutes. The invention also relates to a preparation method of the environment-friendly alkali and chlorine free liquid setting accelerator.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an environment-friendly green alkali-free and chlorine-free liquid quick-setting agent for shotcrete. Background technique [0002] At present, most of the accelerators used in shotcrete produced in China are accelerators with high alkali content. The biggest disadvantages of this accelerator are: first, the durability and service life of concrete are reduced due to the incorporation of a large amount of alkali; The introduction of a large amount of alkali leads to the decrease of the 28d strength of the concrete in the later stage, and practice has proved that the decrease can reach 25-50%. Due to the existence of a large amount of alkaline substances, it will react with the active components in the aggregate inside the concrete, which will cause the alkali-aggregate reaction of the concrete. In addition, because strong alkali is highly corrosive and has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/12
Inventor 高永会
Owner 高永会
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