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Liquid accelerator for sprayed concrete and application thereof

A technology of shotcrete and quick-setting admixture, applied in the field of building materials, can solve the problems of high alkalinity of quick-setting admixture, reduced concrete strength, concrete flash setting, etc., and achieves fast early strength, good quick-setting effect, and less rebound. Effect

Inactive Publication Date: 2013-11-20
JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the accelerators used in China are composed of aluminate, carbonate or silicate as the main component, and then compounded with other inorganic salts. These accelerators are highly alkaline and It is easy to cause damage to the eyes and skin of construction workers, and it is also easy to cause "flash setting" of concrete, which affects the hydration structure of concrete and reduces the strength of concrete in the later stage
At the same time, the material has poor bonding performance and a high rebound rate in construction, resulting in material waste and increasing the project cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The liquid quick-setting agent for shotcrete includes the following components by weight percentage: aluminum sulfate 50%, triethanolamine 0.5%, sodium aluminate 15%, hydroxypropyl methylcellulose 3.0%, aliphatic hydroxysulfonate condensate 5 %, and the balance is water, which is prepared by mixing the above-mentioned components. The above components are all commercially available products.

[0015] In the sprayed concrete construction process, in the cement, the quick-setting agent of the present invention is mixed, and the dosage of the quick-setting agent is 5% of the cement weight; the initial setting time of the cement can be 3min, the final setting time is 5min, and the cement mortar 1d The compressive strength reaches 13.43MPa, and the 28d compressive strength ratio exceeds 95%.

Embodiment 2

[0017] The liquid quick-setting agent for shotcrete comprises the following components by weight percentage: 40% of aluminum sulfate, 0.7% of triethanolamine, 10% of potassium aluminate, 5.0% of hydroxyethyl cellulose, 5% of sulfonated melamine formaldehyde resin, and the balance is Water; prepared by mixing the above components. The above components are all commercially available products.

[0018] In the shotcrete construction process, in the cement, the quick-setting agent of the present invention is mixed, and the dosage of the quick-setting agent is 4% of the cement weight, so that the initial setting time of the cement can be 3.5min, and the final setting time is 6min. The 1d compressive strength reaches 8.12MPa, and the 28d compressive strength ratio exceeds 96%.

Embodiment 3

[0020] The liquid quick-setting agent for shotcrete includes the following components in weight percent: 40% of aluminum sulfate, 1.0% of triethanolamine, 10% of sodium aluminate, 5.0% of methyl cellulose, 7% of aliphatic hydroxysulfonate condensate, and the remaining The amount is water; it is prepared by mixing the above-mentioned components. The above components are all commercially available products.

[0021] In the sprayed concrete construction process, in the cement, the quick-setting agent of the present invention is mixed, and the dosage of the quick-setting agent is 3% of the cement weight, so that the initial setting time of the cement can be 2.5min, and the final setting time is 4.5min. The 11d compressive strength of the sand reaches 8.28MPa, and the 28d compressive strength ratio exceeds 98%.

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Abstract

The invention discloses liquid accelerator for sprayed concrete and application thereof. The liquid accelerator for sprayed concrete comprises, by weight percent, 30-50% of aluminum sulfate, 0.5-1.5% of triethanolamine, 10-30% of aluminate, 1.0-5.0% of cellulose, 5-10% of efficient water reducer, and the balance of water. In construction of the sprayed concrete, the accelerator 2-5% of cement is dosed. The accelerator is effective in setting acceleration, initial setting time is 2min-4min, final setting time is 4min-8min, early strength attains fast, 28d compressive strength ratio is over 95%, and the accelerator is high in cohesiveness and low in resilience. In addition, the accelerator is chloride-free and low in alkali and is capable of lowering the risk of concrete alkali-aggregate reaction and erosion of reinforced concrete.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a liquid quick-setting agent for sprayed concrete and its application. Background technique [0002] Accelerator is an indispensable admixture in shotcrete construction. Its function is to quickly set and harden the concrete slurry. At present, most of the accelerators used in China are composed of aluminate, carbonate or silicate as the main component, and then compounded with other inorganic salts. These accelerators are highly alkaline and It is easy to cause damage to the eyes and skin of construction workers, and it is also easy to cause "flash setting" of concrete, which affects the hydration structure of concrete and causes the strength of concrete to decrease in the later stage. At the same time, the material has poor bonding performance and high construction rebound rate, resulting in material waste and increasing the project cost. Contents of the inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/12
Inventor 王卫东孔飞杨志峰
Owner JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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