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Cement-base sound-absorbing material for tunnel wall surfaces and preparation method thereof

A technology for sound absorption of tunnel walls and bases, applied in the field of cement-based sound-absorbing materials and their preparation, can solve the problems of obvious sound-absorbing effect, unsuitable for tunnel applications, and no mention of sound-absorbing effect, etc. Simple, sound-absorbing performance

Active Publication Date: 2015-09-02
CHINA JINGYE ENG TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still few reports on the research on tunnel wall sound-absorbing materials at home and abroad.
[0004] Most of the existing sound-absorbing materials are factory-prefabricated stereotyped materials, such as sound-absorbing panels, which need to be prefabricated in the factory and then assembled on site. However, this kind of sound-absorbing panels are not suitable for special structures such as tunnels. Applications
[0005] Chinese patent ZL 200810027567.2 discloses "an environmentally friendly and sound-absorbing tunnel fire-proof coating". Although it provides a tunnel fire-proof coating with sound-absorbing function, it only mentions that its sound-absorbing effect is obvious, and does not mention that it can achieve What kind of sound absorption effect

Method used

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  • Cement-base sound-absorbing material for tunnel wall surfaces and preparation method thereof
  • Cement-base sound-absorbing material for tunnel wall surfaces and preparation method thereof
  • Cement-base sound-absorbing material for tunnel wall surfaces and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The cement-based sound-absorbing material for the tunnel wall, in parts by mass, has the following raw material composition:

[0026]

[0027] Put expanded vermiculite, portland cement, class II fly ash, vegetable protein air-entraining agent, magnesium aluminum silicate thixotropic agent, ethylene vinyl acetate copolymer rubber powder and polypropylene fiber into the mixer according to their respective mass parts, Mix well to obtain a dry mix. When applying, add water with 85% of the total mass of the dry mixture to the dry mixture, stir evenly in the mortar machine integrating stirring, pumping and spraying, and then spray in layers on the total area of ​​10.08m 2 On the cement board, each layer is sprayed with a thickness of 8-9mm. After the material of the previous spraying is hardened, the next spraying is carried out. The total spraying thickness reaches 25mm. The conventional natural maintenance is 28 days, and the test noise reduction coefficient NRC is 0.65....

Embodiment 2

[0029] The cement-based sound-absorbing material for the tunnel wall, in parts by mass, has the following raw material composition:

[0030]

[0031]

[0032] Put expanded vermiculite, portland cement, class II fly ash, vegetable protein air-entraining agent, magnesium aluminum silicate thixotropic agent, ethylene vinyl acetate copolymer rubber powder and polypropylene fiber into the mixer according to their respective mass parts, Mix well to obtain a dry mix. When applying, add water with 90% of the total mass of the dry mixture into the dry mixture, stir evenly in the mortar machine integrating stirring, pumping and spraying, and then spray in layers on the total area of ​​10.08m 2 On the cement board, each layer is sprayed with a thickness of 8-9mm. After the material of the previous spraying is hardened, the next spraying is carried out. The total spraying thickness reaches 25mm. The conventional natural curing is 28 days, and the noise reduction coefficient NRC is 0...

Embodiment 3

[0034] The cement-based sound-absorbing material for the tunnel wall, in parts by mass, has the following raw material composition:

[0035]

[0036] Put expanded vermiculite, portland cement, class II fly ash, vegetable protein air-entraining agent, magnesium aluminum silicate thixotropic agent, styrene acrylate copolymer rubber powder and polypropylene fiber into the mixer according to their respective mass parts, Mix well to obtain a dry mix. When applying, add water with 85% of the total mass of the dry mixture to the dry mixture, stir evenly in the mortar machine integrating stirring, pumping and spraying, and then spray in layers on the total area of ​​10.08m 2 On the cement board, each layer is sprayed with a thickness of 8-9mm. After the material of the previous spraying is hardened, the next spraying is carried out. The total spraying thickness reaches 25mm. The conventional natural maintenance is 28 days, and the test noise reduction coefficient NRC is 0.65.

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Abstract

The invention belongs to the technical field of cement-base sound-absorbing materials, and relates to a cement-base sound-absorbing material for tunnel wall surfaces and a preparation method thereof. The cement-base sound-absorbing material for tunnel wall surfaces comprises the following raw materials in parts by mass: 100 parts of expanded vermiculite, 100-160 parts of cement, 100-160 parts of fly ash, 0.1-0.2 part of air entraining agent, 1-3 parts of thixotropic agent, 3-5 parts of redispersible latex powder and 0.5-1 part of polypropylene fiber. The cement-base sound-absorbing material for tunnel wall surfaces can be prepared into a dry mixture, and is environment-friendly. The cement-base sound-absorbing material for tunnel wall surfaces can be mixed with water on site and sprayed on the tunnel wall surface, and thus, is convenient for construction. The cement-base sound-absorbing material for tunnel wall surfaces is mainly composed of expanded vermiculite and foaming cement with excellent fire resistance, and thus, has favorable fire resistance; and the combustion performance can reach Grade A. The noise reduction coefficient (NRC) is greater than or equal to 0.60, and the cement-base sound-absorbing material for tunnel wall surfaces has favorable sound absorptivity. The material can form a hard sound-absorbing material, and has the advantages of disturbance resistance and favorable weather resistance.

Description

technical field [0001] The invention belongs to the technical field of cement-based sound-absorbing materials, and in particular relates to a cement-based sound-absorbing material for tunnel walls and a preparation method thereof. The cement-based sound-absorbing materials for tunnel walls are environmentally friendly, easy to construct, and fireproof and sound-absorbing properties. Background technique [0002] With the rapid development of public transportation in my country, railway tunnels, highway tunnels and subway tunnels have developed rapidly in China in recent years. Due to the great danger of tunnel fire, there have been many studies on fireproof materials for tunnel walls at home and abroad; at the same time, the harm caused by noise in tunnels has also been paid more and more attention: traffic noise in the semi-enclosed space of the tunnel, after multiple reflections on the wall, The longer the reverberation time, the more intense the noise, which will have a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
Inventor 高汉青于大第张剑王炜杨晓光宋涛文陈夙郑旗邓宽王满凯李伟
Owner CHINA JINGYE ENG TECH CO LTD
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