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Shotcrete additive and spraying technology of shotcrete

A technology of sprayed concrete and admixtures, which is applied in the field of sprayed concrete admixtures and shotcrete spraying technology, can solve the problems of high dust concentration, achieve the effects of reducing dust concentration, reducing rebound rate, and reducing alkali corrosion

Inactive Publication Date: 2012-05-23
HUAINAN MINING IND GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention also provides a spraying process of sprayed concrete, through the improvement of the admixture, not only the problem of high dust concentration in the dry spraying process is solved, but also the efficiency of the spraying operation is improved

Method used

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  • Shotcrete additive and spraying technology of shotcrete
  • Shotcrete additive and spraying technology of shotcrete
  • Shotcrete additive and spraying technology of shotcrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The spraying process of sprayed concrete provided by the present invention is specifically described through this embodiment. The composition of shotcrete admixture is shown in Table 1:

[0029] Table I

[0030]

[0031] Among them, the standards for the aggregate used in the spraying operation using the above-mentioned sprayed concrete admixture are: cement: P.O 42.5, stone: maximum particle size ≤ 5mm, sand: medium sand; the weight ratio of cement, cement, and sand in the aggregate is 1 : 2: 2; when the ambient temperature of the shotcrete construction site was 20°C, the admixture of the shotcrete admixture was about 3% of the cement weight, and the admixture of the shotcrete admixture could be based on the ambient temperature The reduction or increase of the appropriate increase or decrease.

[0032] Shotcrete spraying process:

[0033] Pour the sprayed concrete admixture (30kg) into the liquid mixing container (the liquid mixing container is made of corrosion-...

Embodiment 2

[0043] According to the spraying process of sprayed concrete of embodiment one, wherein the composition of sprayed concrete admixture can also be, as shown in table two:

[0044] Table II

[0045]

[0046] Wherein, the standard of the aggregate used when using the sprayed concrete admixture of this embodiment for spraying operations is: cement: P.O 42.5, stone: maximum particle size ≤ 5mm, sand: medium sand; the weight of cement, cement, and sand in the aggregate The ratio is 1: 2: 2; when the ambient temperature of the construction site is 20°C, the admixture of the shotcrete admixture is about 3% of the cement weight, and the admixture of the shotcrete admixture can be adjusted according to the environment. The decrease or increase of temperature is appropriately increased or decreased.

[0047] Specific spraying process: except that the composition of the sprayed concrete admixture in Table 1 is adjusted to the composition of Table 2, the specific implementation process...

Embodiment 3

[0055] According to the spraying process of the sprayed concrete of embodiment one, wherein the composition of sprayed concrete admixture and aggregate can also be, as shown in table three:

[0056] Table three

[0057]

[0058] Wherein, the standard of the aggregate used when using the sprayed concrete admixture of this embodiment for spraying operations is: cement: P.O 42.5, stone: maximum particle size ≤ 5mm, sand: medium sand; the weight of cement, cement, and sand in the aggregate The ratio is 1: 2: 2; when the ambient temperature of the construction site is 20°C, the admixture of the shotcrete admixture is about 3% of the cement weight, and the admixture of the shotcrete admixture can be adjusted according to the environment. The decrease or increase of temperature is appropriately increased or decreased.

[0059] Specific spraying process: except that the composition of the sprayed concrete admixture in Table 1 is adjusted to the composition of Table 3, the specific...

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Abstract

The invention provides a shotcrete additive and a spraying technology of shotcrete. The shotcrete additive comprises: 15-25 parts of a setting accelerator, 50-80 parts of a reinforcing agent, 1-5 parts of a dispersant, and 0.1-6 parts of a flocculating agent. The invention also provides a spraying technology of shotcrete. The technology employs the above shotcrete additive and utilizes an existing dry shotcreting machine under a coal mine for wet shotcreting operation. Therefore, the problems that existing dry shotcreting additives cannot satisfy the technological requirements of wet shotcreting as well as dry shotcreting technologies have a high dust concentration can be solved.

Description

technical field [0001] The invention relates to a concrete spraying material and a concrete spraying process, in particular to a sprayed concrete admixture and a sprayed concrete spraying process used in anchor spraying support operations in underground coal mines. Background technique [0002] The shotcrete operation in the coal mine is an important part of the bolting and shotcreting support operation in the coal mine. Shotcrete is to use compressed air or other power to transport the mixed concrete aggregate and admixture in a certain proportion through the pipeline and spray it to the sprayed surface (rock surface, formwork, old building) at high speed with the help of spraying machinery. A concrete made by setting and hardening. [0003] The spraying operation of shotcrete is mainly divided into dry spraying process and wet spraying process according to the process flow. The wet spraying machine corresponding to the wet spraying process is bulky and heavy and difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B24/12
Inventor 苏红宫耀尹建国王金荣阚甲广
Owner HUAINAN MINING IND GRP
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