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Liquid accelerator for sprayed concrete and application thereof

A technology of sprayed concrete and quick-setting agent, which is applied in the field of building materials, can solve the problems of reduced concrete strength, high alkalinity of quick-setting agent, high construction rebound rate, etc., and achieve good quick-setting effect, fast early strength and good cohesiveness Good results

Inactive Publication Date: 2012-11-21
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 accelerator 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 %, the balance is water, which is prepared by mixing the above components. The above components are all commercially available products.

[0015] During the construction of the shotcrete, the accelerator of the present invention is mixed into the cement, and the amount of the accelerator is 5% of the weight of the cement; the initial setting time of the cement is 3min, the final setting time is 5min, and the cement mortar is 1d The compressive strength reaches 13.43MPa, and the 28d compressive strength ratio exceeds 95%.

Embodiment 2

[0017] The liquid accelerator for shotcrete includes the following components by weight percentage: aluminum sulfate 40%, triethanolamine 0.7%, potassium aluminate 10%, hydroxyethyl cellulose 5.0%, sulfonated melamine formaldehyde resin 5%, the balance is Water; Mix and prepare the above components. The above components are all commercially available products.

[0018] During the construction of the shotcrete, the accelerator of the present invention is mixed into the cement, and the amount of the accelerator is 4% of the weight of the cement, so that the initial setting time of the cement is 3.5min, the final setting time is 6min, and the cement mortar The 1d compressive strength reaches 8.12MPa, and the 28d compressive strength ratio exceeds 96%.

Embodiment 3

[0020] The liquid accelerator for shotcrete includes the following components by weight percentage: 40% aluminum sulfate, 1.0% triethanolamine, 10% sodium aluminate, 5.0% methylcellulose, 7% aliphatic hydroxysulfonate condensate, and the rest The amount is water; the above components are mixed and formulated. The above components are all commercially available products.

[0021] During the construction of the shotcrete, the accelerator of the present invention is mixed into the cement. The amount of the accelerator is 3% of the weight of the cement, which can make the initial setting time of the cement 2.5min and the final setting time 4.5min. The 11d compressive strength of 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 accelerator for sprayed concrete and its application. Background technique [0002] In the construction of shotcrete, accelerator is an indispensable admixture. Its function is to quickly set and harden the concrete slurry. At present, most of the quick-setting agents used in China are mainly made of aluminate, carbonate or silicate, and then compounded with other inorganic salts. These quick-setting agents are highly alkaline. It is easy to cause damage to the eyes and skin of the constructors, and it is also easy to cause the "flashing" of the concrete, which affects the hydration structure of the concrete and causes the later strength of the concrete to decrease. At the same time, the material bonding performance is poor and the construction rebound rate is high, resulting in material waste and increasing project cost. Summary of the invention [0003] In orde...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B22/14
Inventor 王卫东孔飞杨志峰
Owner JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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