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Sound-absorbing material for subway and its preparing process

A sound-absorbing material, subway technology, applied in the field of sound-absorbing materials, can solve the problems of low cost and high sound-absorbing coefficient, and achieve the effect of low bulk density, high sound-absorbing coefficient, and excellent high-frequency sound-absorbing performance

Inactive Publication Date: 2004-10-06
曾令可
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of existing sound-absorbing materials, and provide a method for preparing subway sound-absorbing materials with high sound-absorbing coefficient and low cost

Method used

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  • Sound-absorbing material for subway and its preparing process
  • Sound-absorbing material for subway and its preparing process
  • Sound-absorbing material for subway and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] figure 1 Show the technological process of the subway sound-absorbing material preparation method of the present invention, by figure 1 Visible, the technological process of this method comprises the following operation steps: (1) ceramsite, cement and fly ash in the base material are mixed; (2) dilute foaming agent with water, add the mixture of ceramsite, cement and fly ash (3) Forming; (4) Curing. The composition of the base material of the subway sound-absorbing material is: ceramsite: 70%; alunite expansion cement: 20%; fly ash: 10%; foaming agent: 2%. The subway sound-absorbing material can be prepared according to the above-mentioned technological process, and its performance test results are shown in Table 1.

[0017] Wet bulk density (kg / m 3 )

Embodiment 2

[0019] Wet bulk density (kg / m3)

[0020] As can be seen from the foregoing examples, the sound absorption coefficient and compressive strength results of the subway sound-absorbing material prepared by this method are all relatively ideal, especially the sound-absorbing effect in the middle and high frequency bands is better, according to the industrial standard of the United States (ASTMC423-84A), The sound absorption coefficient is 0.75 when the frequency is 500Hz; the sound absorption coefficient is 0.85 when the frequency is 1000Hz; industry standard.

[0021] The present invention selects ceramsite as aggregate because it has the advantages of small bulk density, antifreeze, impact resistance, shock resistance, non-toxicity, non-combustibility, no smoke, and good durability. Its chemical composition and physical properties are shown in Table 3 and Table 4 The purpose of choosing alumite expanded cement is to compensate the volume shrinkage that occurs during the...

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Abstract

A sound-absorbing material for subway is prepared from haydite (40-70%), cement (20-48%) flyash (0-10%) and foaming agent (1-2%) through diluting foaming agent with water, mixing the others, adding the deluted foaming agent to the mixture and shaping. Its advantages are broad audio band, high sound absorptivity, low volume weight, high strength, resisting fire and water, no toxicity, and low cost.

Description

(1) Technical field [0001] The invention relates to a sound-absorbing material, in particular to a subway sound-absorbing material used in a subway tunnel and a preparation method thereof. (2) Background technology [0002] Subway sound-absorbing materials are mainly used in the construction of subway tunnels to absorb and eliminate the noise generated by subways. According to the requirements of the use environment, subway sound-absorbing materials must meet the following conditions: ①Waterproof, flame-retardant, at least not less than 20 years old Service life; ② does not contain asbestos, mineral fiber, polystyrene and corrosive substances; ③ in order to meet the safety and fire prevention requirements, the fire value, smoke value and flammability value of sound-absorbing materials should be zero; ④ has a high The medium and high frequency sound absorption coefficient and certain strength. At present, the subway sound-absorbing materials used in China are mainly imported...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B14/04C04B18/08C04B28/04E04B1/82
CPCY02W30/91
Inventor 曾令可黄浪欢黄其秀张守梅任雪潭罗民华
Owner 曾令可
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