Sprayed concrete

A technology of sprayed concrete and quick-setting agent, which is applied in the field of concrete, can solve the problems that the splitting tensile strength and flexural strength cannot meet the needs of underground civil engineering, and achieve the effect of improving the splitting tensile strength

Inactive Publication Date: 2013-10-23
解波
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a shotcrete to solve the problem that ordinary concrete in the prior art cannot meet the needs of underground civil engineering in terms of splitting tensile strength and flexural strength

Method used

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Embodiment Construction

[0013] A shotcrete whose components include cement, sand, stones, water, quick-setting agent, and bundled monofilament polypropylene fibers, wherein the weight ratio of the components cement, sand, stones, and water is 1:1.84:1.84: 0.45, the amount of quick-setting agent is 2%~4% of the weight of cement, and the amount of polypropylene fiber is 0.6 kg / m 3 ~1.5 kg / m 3 .

[0014] In the present invention, the cement is preferably Portland cement or ordinary Portland cement whose grade is not lower than P.O42.5. Because the C of these two cements 3 S and C 3 The content of A is higher, the compatibility with the accelerator is good, it can set quickly and harden quickly, and the later strength is also higher.

[0015] In the present invention, the sand is preferably coarse sand with a fineness modulus greater than 2.5. If the sand is too fine, the dry shrinkage of the concrete will increase; if the sand is too coarse, the rebound will increase. Particles smaller than 0.075m...

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Abstract

The invention discloses a sprayed concrete comprising the components of cement, sand, pebbles, water, an accelerating agent and bundle-shaped monofilament polypropylene fibers. By utilizing the bundle-shaped monofilament polypropylene fibers with the mixing amount of 0.9kg / m<3>-1.5kg / m<3>, the splitting tensile strength and the rupture strength of the concrete can be effectively improved so as to meet the needs of civil engineering under mine.

Description

technical field [0001] The invention relates to the field of concrete, in particular to shotcrete. Background technique [0002] Concrete refers to the general designation of engineering composite materials in which aggregates are cemented into a whole by cementitious materials. Concrete is generally made of cement as cementitious material, sand and stone as aggregate, mixed with water (with or without admixtures and admixtures) in a certain proportion, and is formed by stirring, molding and curing. It is also called ordinary concrete and is widely used. Applied to civil engineering. Undermine civil engineering requires high splitting tensile strength and flexural strength of concrete, and the existing ordinary concrete cannot meet the needs of underground civil engineering. Contents of the invention [0003] The purpose of the present invention is to provide a sprayed concrete to solve the problem that the conventional concrete cannot meet the needs of underground civil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/06C04B16/06
Inventor 解波
Owner 解波
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