C20 coal mine down-hole roadway protection concrete prepared from fly ash aggregates, and preparation method thereof

A technology of fly ash ceramsite and concrete, which is applied to the field of shotcrete in coal mines, can solve the problems of limited treatment effect, occupation of land, pollution of the environment, etc., and achieve the effect of realizing waste utilization, facilitating transportation and construction, and reducing environmental damage.

Active Publication Date: 2016-01-13
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accumulation of fly ash occupies a large amount of land, releases harmful substances, and seriously pollutes the environment
A lot of manpower, material and financial resources have been invested in the storage of fly ash and pollution control, but the control effect is very limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The C20 coal mine roadway protection concrete prepared by the fly ash ceramsite of the present embodiment is composed of P32.5 Portland cement, sand, fly ash ceramsite, water and quick-setting agent, and prepared 1m 3 Coal mine underground roadway C20 fly ash ceramsite concrete needs cement: 450kg, sand: 810kg, ceramsite: 605kg, water: 180kg, accelerator: 22.5kg, that is, cement, sand, and fly ash pottery in each cubic meter of concrete The weight ratio of granules, water and accelerator is 1:1.80:1.34:0.40:0.05, and its density is 1988kg / m 3 , The 28-day strength is 29.6MPa.

[0021] Among them, the fly ash ceramsite is a spherical particle formed by processing, pelletizing and sintering the dry discharge of fly ash in a power plant, with a particle size of 6 mm and an apparent density of 1590 kg / m 3 , Cylinder compressive strength 5.5MPa, 1h water absorption rate 12.1%.

[0022] The sand is medium sand with a fineness modulus of 2.8 and an average particle size of 0...

Embodiment 2

[0028] The C20 coal mine roadway protection concrete prepared by the fly ash ceramsite of the present embodiment is composed of P32.5 Portland cement, sand, fly ash ceramsite, water and quick-setting agent, and prepared 1m 3 C20 fly ash ceramsite concrete for underground roadway protection in coal mines requires cement: 450kg, sand: 920kg, ceramsite: 510kg, water: 190kg, accelerator: 22.5kg, that is, cement, sand, and fly ash pottery in each cubic meter of concrete The weight ratio of granules, water and accelerator is 1:2.04:1.13:0.42:0.05, and its density is 2003kg / m 3 , The 28-day strength is 30.2MPa.

[0029] Among them, the fly ash ceramsite is a spherical particle formed by processing, pelletizing and sintering the dry discharge of fly ash in a power plant, with a particle size of 9mm and an apparent density of 1620kg / m 3 , Cylinder compressive strength 5.1MPa, 1h water absorption rate 11.5%.

[0030] The sand is medium sand with a fineness modulus of 3.0 and an averag...

Embodiment 3

[0036] The C20 coal mine roadway protection concrete prepared by the fly ash ceramsite of the present embodiment is composed of P32.5 Portland cement, sand, fly ash ceramsite, water and quick-setting agent, and prepared 1m 3 C20 fly ash ceramsite concrete for underground protection roadway in coal mine needs cement: 450kg, sand: 1140kg, ceramsite: 405kg, water: 200kg, accelerator: 22.5kg, that is, cement, sand, and fly ash pottery in each cubic meter of concrete The weight ratio of granules, water and accelerator is 1:2.53:0.90:0.44:0.05, and its density is 2118kg / m 3 , The 28-day strength is 31.7MPa.

[0037] Among them, the fly ash ceramsite is a spherical particle formed by processing, pelletizing and sintering the dry discharge of fly ash in a power plant, with a particle size of 8mm and an apparent density of 1650kg / m 3 , Cylinder compressive strength 6.0MPa, 1h water absorption rate 12.8%.

[0038] The sand is medium sand with a fineness modulus of 2.3 and an average p...

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Abstract

The invention belongs to the technical field of coal mine down-hole shotcrete, and relates to a C20 coal mine down-hole roadway protection concrete prepared from fly ash aggregates, and a preparation method thereof. The C20 coal mine down-hole roadway protection concrete prepared from fly ash aggregates is composed of cement, sands, fly ash aggregates, water and a setting accelerator according to a weight ratio of 1:(1.80-2.53):(0.90-1.34):(0.40-0.44):0.05, the density of the concrete is 1800-2200kg/m<3>, and the 28d strength is 29-32MPa. The preparation method of the concrete comprises the following steps: weighing above raw materials according to the weight ratio, immersing the fly ash aggregates in water for at least 1h, drying the surface of the fly ash aggregates in the shade, mixing cement, the sands and the dried aggregates, uniformly stirring, adding water and the setting accelerator, continuously stirring until uniformity, and discharging. The aggregates are used to substitute sands in common concrete, so destroys of quarrying to environment are reduced, wastes are changed into valuables, waste utilization is realized, and the concrete has good environment benefit and economic benefit.

Description

technical field [0001] The invention belongs to the technical field of shotcrete underground in coal mines, and relates to C20 underground roadway protection concrete in coal mines prepared with fly ash ceramsite and a preparation method thereof. Background technique [0002] Shotcrete support is a support method developed on the basis of the self-stabilization theory of surrounding rocks. It has advanced technology and reliable engineering quality. The combination of shotcrete support, anchor rod and metal mesh improves the support performance and engineering quality, and improves the integrity and stability of the roadway. It is one of the most widely used support forms at present. [0003] The components of ordinary concrete include cement, sand, stones, water and additives. The sources of stones are crushed stones and pebbles. In order to obtain stones, it is necessary to dig mountains and gravels or dig rivers, which has caused great damage to the environment. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/06C04B18/08
CPCY02W30/91
Inventor 陈蓥朱志洁张宏伟霍丙杰李云鹏吴文达韩军宋卫华
Owner LIAONING TECHNICAL UNIVERSITY
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