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Concrete additive special for gob-side entry retaining support

A technology of cement concrete and admixtures, applied in the field of cement additives, to achieve the required effects of good workability, high compactness, and good fluidity

Inactive Publication Date: 2010-04-21
王芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of accelerating the solidification speed of the roadside filling body and improving the strength, the present invention provides a special cement concrete admixture for support of gob-side entry retaining

Method used

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  • Concrete additive special for gob-side entry retaining support

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Embodiment 1

[0011] Embodiment 1. A special cement concrete admixture for gob-side entry retaining support, which is composed of the following raw materials in the weight ratio, and the particle size is 200×10 -9 M tuff powder 94%, bauxite 5%, grinding aid triethylpropanolamine 1%.

[0012] The admixture is mixed with cement, gravel, sand and water to make concrete material as roadside filling body. Specifically implement according to the following weight ratios, 20 parts of cement, 15 parts of stones, 40 parts of sand and 20 parts of water, and the addition amount of the admixture described in the present invention is 2% of the total weight. After the above raw materials are mixed evenly, they can be smoothly pumped to the construction site of 1000 meters within 3 minutes. After 25 minutes, they can be quickly set, and the strength can reach 5MPa in 3 hours. .

Embodiment 2

[0013] Embodiment 2. A special cement concrete admixture for gob-side entry retaining support, which is composed of the following raw materials in the weight ratio, and the particle size is 100×10 -9 M tuff powder 93%, bauxite 6%, grinding aid triethylpropanolamine 2%.

[0014] The admixture is mixed with cement, gravel, sand and water to make concrete material as roadside filling body. Specifically implement according to the following weight ratios, 22 parts of cement, 15 parts of stones, 45 parts of sand and 20 parts of water, and the addition amount of the admixture described in the present invention is 6% of the total weight. After the above raw materials are mixed evenly, they can be smoothly pumped to the construction site of 1500 meters within 5 minutes. After 28 minutes, they can be quickly set, and the strength can reach 6MPa in 3 hours. 52 MPa.

Embodiment 3

[0015] Embodiment 3. A special cement concrete admixture for gob-side entry retaining support, which is composed of the following raw materials in the weight ratio, and the particle size is 350×10 -9 M's tuff powder 95%, bauxite 4%, grinding aid triethylpropanolamine 1%.

[0016] The admixture is mixed with cement, gravel, sand and water to make concrete material as roadside filling body. Specifically implement according to the following weight ratios, 25 parts of cement, 18 parts of stones, 50 parts of sand and 24 parts of water, and the addition amount of the admixture described in the present invention is 4% of the total weight. After the above raw materials are mixed evenly, they can be smoothly pumped to the construction site of 1200 meters within 4 minutes. After 27 minutes, they can be quickly set, and the strength can reach 7MPa in 3 hours. 52 MPa.

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Abstract

The invention relates to a concrete additive, in particular to a concrete additive special for gob-side entry retaining support. The invention solves the problems of entry slab filler curing speed acceleration and entry slab strength improvement. The additive is characterized by being prepared from the following raw material in percentage by weight: tuff powder with a granularity of 100-350x10-9m 93-95, bauxite 4-6 and triisopropanolamine serving as a grinding aid 1-2. The additive is added in concrete in an amount which is 10 to 20 percent of the weight of cement. Thereafter, the concrete quickly cures in 25 minutes and achieves so high a strength of 5 to 7MPa in 3 to 4 hours as to allow for form removal as well as a strength of about 15MPa in 24 hours and a strength of 50MPa after 28 days. Thus, a high-strength support effect is achieved in a short time.

Description

technical field [0001] The invention relates to a cement additive, in particular to a special cement concrete admixture for gob-side entry retaining support. Background technique [0002] Usually, hydraulic props are used to support the coal roof during the mining process, and the retaining roadway after goaf can rely on pouring continuous walls to control roof caving and subsidence. The support characteristics of rigidity and softness must be considered, that is, the concrete wall can be set quickly And to generate early strength, the interval time and gap distance of the roof pressure release must also be considered, that is, the requirements of the formation pressure on the design strength of the underground wall must be considered, and the pressure release distance and the design thickness of the flexible material must also be considered. Usually a cycle is about 30-40 minutes. During this period, the concrete must be pumped into the mold box for initial setting within 3...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B22/06C04B14/14
CPCC04B2111/0075C04B40/0039
Inventor 王磊王琛闫玮薛峰胡效生畅效锐康晶晶
Owner 王芳