A kind of coal gangue manufactured sand and its preparation method and application

A technology of coal gangue and machine-made sand, which is applied in the field of concrete, can solve problems such as concrete cracking, and achieve the effect of protecting the environment and saving resources

Active Publication Date: 2022-07-08
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is a kind of coal gangue machine-made sand and its preparation method and application. The coal gangue machine-made sand provided by the invention can be used to prepare concrete with different strengths, and the concrete obtained has higher strength and is not easy to crack, which solves the problem of The use of coal gangue as a fine aggregate in concrete can easily lead to concrete cracking

Method used

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  • A kind of coal gangue manufactured sand and its preparation method and application
  • A kind of coal gangue manufactured sand and its preparation method and application
  • A kind of coal gangue manufactured sand and its preparation method and application

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preparation example Construction

[0024] The present invention also provides the preparation method of the coal gangue manufactured sand according to the above technical solution, which includes: crushing the coal gangue to a particle size of ≤5 mm, adjusting the gradation and drying to obtain the coal gangue manufactured sand.

[0025] The present invention crushes the coal gangue to a particle size of less than or equal to 5 mm, and obtains the crushed coal gangue. The invention reduces the particle size of the coal gangue to ≤5mm by crushing, so as to prepare for the subsequent adjustment of gradation. In the present invention, the equipment used for crushing is preferably a crusher. The source of the coal gangue is not particularly limited in the present invention, and the coal gangue well known to those skilled in the art can be used.

[0026] The crushed coal gangue is obtained, and the present invention obtains the coal gangue machine-made sand by adjusting the gradation and then drying. The invention...

Embodiment 1

[0046] (1) crushing the coal gangue to a particle size of less than or equal to 5 mm to obtain the crushed coal gangue;

[0047] (2) adjusting the gradation of the above-mentioned crushed coal gangue, in terms of parts by mass, 24 parts of coal gangue of 1.18~5mm, 40 parts of coal gangue of 0.3~1.18mm, and 36 parts of coal gangue of 0.075~0.3mm, to obtain Graded coal gangue;

[0048] (3) Drying the above graded coal gangue at 100°C for 10 hours to obtain coal gangue machine-made sand, the fineness modulus is 2.5, the loss on ignition is 20%, the water content is less than 0.1%, and the mass content of the quartz phase is was 73%.

Embodiment 2

[0050] (1) crushing the coal gangue to a particle size of less than or equal to 5 mm to obtain the crushed coal gangue;

[0051] (2) adjusting the gradation of the above-mentioned crushed coal gangue, in terms of parts by mass, 33 parts of coal gangue of 1.18~5mm, 40 parts of coal gangue of 0.3~1.18mm, and 27 parts of coal gangue of 0.075~0.3mm, to obtain Graded coal gangue;

[0052] (3) Drying the above graded coal gangue at 100°C for 10 hours to obtain coal gangue machine-made sand, the fineness modulus is 2.6, the loss on ignition is 20%, the water content is less than 0.1%, and the mass content of the quartz phase is was 73%.

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Abstract

The invention belongs to the technical field of concrete, and provides a coal gangue machine-made sand, the fineness modulus of the coal gangue machine-made sand is 2.5-2.9, and the ignition loss is 10-20%. The invention reduces the carbon content of the coal gangue by controlling the fineness modulus and the loss on ignition of the coal gangue machine-made sand, thereby solving the problem that the use of the coal gangue as the fine aggregate in the concrete easily leads to cracking of the concrete. The results of the examples show that with the coal gangue machine-made sand provided by the present invention as the fine aggregate, the compressive strength of the prepared C05 concrete is 6.17-7.94 MPa, the compressive strength of the C10 concrete is 12.18-14.76 MPa, and the compressive strength of the C20 concrete is The compressive strength is 20.51-22.86MPa, the compressive strength of C30 concrete is 30.41-34.52MPa, and the compressive strength of C40 concrete is 40.52-42.76MPa.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a coal gangue machine-made sand and a preparation method and application thereof. Background technique [0002] Coal gangue is a kind of mixed rock mass discharged during the construction and production of coal mines, including gangue discharged from coal mine tunneling, gangue stripped during open-pit coal mining, and gangue discharged during washing and processing. The output of coal gangue accounts for about 10-25% of the coal mining volume, and 1,500 coal gangue stacks have been formed. The national total of coal gangue is about 4 billion tons, covering an area of ​​300,000 mu, which has become the largest accumulation and annual output in my country. A type of industrial waste with the largest accumulation site. Coal gangue is generally piled up in the open air. After sun exposure, rain, weathering, and decomposition, a large amount of acid water or ionized water carrying h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02C04B18/12C04B28/00
CPCC04B20/026C04B18/12C04B28/00C04B2201/50C04B14/02Y02W30/91
Inventor 刘泽孙星海王栋民周林邦
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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