Coal gangue machine-made sand as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of concrete, and provides coal gangue machine-made sand, wherein the fineness modulus of the coal gangue machine-made sand is 2.5-2.9, and the ignition loss is 10-20%. By controlling the fineness modulus and ignition loss of the coal gangue machine-made sand, the carbon content of the coal gangue is reduced, so that the problem that the concrete is easy to crack when the coal gangue is used as a fine aggregate in the concrete is solved. The result of the embodiment shows that by taking the coal gangue machine-made sand provided by the invention as the fine aggregate, the compressive strength of prepared C05 concrete is 6.17 to 7.94 MPa, the compressive strength of prepared C10 concrete is 12.18 to 14.76 MPa, the compressive strength of prepared C20 concrete is 20.51 to 22.86 MPa, the compressive strength of prepared C30 concrete is 30.41 to 34.52 MPa, and the compressive strength of prepared C40 concrete is 40.52 to 42.76 MPa.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a coal gangue machine-made sand and its preparation method and application. Background technique [0002] Coal gangue is a kind of mixed rock mass discharged during the construction and production of coal mines, including gangue discharged during tunneling of coal mines, 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. There are 1,500 stacks of coal gangue. The total amount of coal gangue in the country is about 4 billion tons, covering an area of ​​300,000 mu. It has become the largest stockpile and annual output in my country. A kind of industrial waste with the largest accumulation site. Coal gangue is generally stacked in the open air. After being exposed to the sun, rain, weathering, and decomposition, a large amount of acidic water or ionized wate...

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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

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