Cement-based railway sound barrier sound-absorbing material and preparation method thereof

A sound absorbing material and sound barrier technology, which is applied in the field of building materials, can solve the problem that railway sound barrier materials cannot meet the requirements, and achieve the effects of good sound absorbing performance, low cost and increasing acoustic impedance.

Active Publication Date: 2019-04-26
CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a cement-based sound-absorbing material for railway sound barriers, aiming to solve the problem that existing railway sound barrier materials cannot meet the requirements of "Technical Requirements and Test Methods for Acoustic Components of Railway Sound Barriers" (TB / T 3122-2010) The problem

Method used

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Examples

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Effect test

preparation example Construction

[0030] A preparation method of a sound-absorbing material for a cement-based railway sound barrier is used for preparing the above-mentioned sound-absorbing material for a cement-based railway sound barrier; the preparation method comprises the following steps:

[0031] a. Weigh the required cement, slag particles, expanded perlite particles, water, water reducing agent, foaming agent and fibers by weight ratio; when the slag particles and / or expanded perlite particles contain water, they are converted into dry The mass of the state is re-weighed, and the contained moisture is included in the water as the raw material; in this step, slag particles and / or expanded perlite particles refer to slag particles, or expanded perlite particles, or slag particles and expanded perlite particles particles;

[0032] b. Add the fiber to the water and stir it quickly with a machine for 30-60s, skip this step when no fiber is added;

[0033] c. Continue to add cement and water reducing agent...

Embodiment 1

[0042] The sound-absorbing material for cement-based railway sound barrier is prepared from the following raw materials by weight: 100 parts of cement, 250 parts of slag particles, 0 parts of expanded perlite particles, 50 parts of water, 3 parts of water reducing agent, and foaming agent 0 parts, 0 parts fiber.

[0043] The method for preparing the above-mentioned cement-based railway sound barrier sound-absorbing material:

[0044] a. Weigh the required cement, slag particles, water and water reducing agent according to the weight ratio; when the slag particles contain water, convert them to the mass of the dry state and weigh them again, and include the moisture content as the raw material. water;

[0045] c. Add cement and water reducing agent into water, and stir to prepare cement paste;

[0046] e. Add slag particles to the cement slurry and stir for 120s to make a semi-dry mixture;

[0047] f. Fill the mixture into the mold, and then press it into a material blank wi...

Embodiment 2

[0053] The sound-absorbing material for cement-based railway sound barrier is prepared from the following raw materials by weight: 100 parts of cement, 180 parts of slag particles, 20 parts of expanded perlite particles, 50 parts of water, 2 parts of water reducing agent, and foaming agent 0 parts, 0 parts fiber.

[0054] The method for preparing the above-mentioned cement-based railway sound barrier sound-absorbing material:

[0055] a. Weigh the required cement, slag particles, expanded perlite particles, water and water reducing agent according to the above-mentioned weight ratio; when the slag particles and / or expanded perlite particles contain water, they are converted into dry state and weighed again , and the moisture content is included in the water used as raw material;

[0056] c. Add cement and water reducing agent into water, and stir to prepare cement paste;

[0057] e. Add slag particles and expanded perlite particles to the cement slurry and stir for 120s to m...

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Abstract

The invention belongs to the field of building materials, particularly discloses a cement-based railway sound barrier absorbing material and a preparation method thereof and is intended to solve the problem that existing railway sound barrier materials are unable to meet the requirements provided in Technical Requirements and Test Methods for Acoustic Elements of Railway Sound Barrier (TB / T 3122-2010). The cement-based railway sound barrier absorbing material is prepared from, by weight, 100 parts of cement, 180-250 parts of mineral residue particles, 0-40 parts of expanded perlite particles, 45-55 parts of water, 2-4 parts of a water reducer, 0-2 parts of a foaming agent, and 0-0.4 part of fibers. The cement-based railway sound barrier absorbing material has good sound-absorbing property and has acoustic properties that meet the requirement in Technical Requirements and Test Methods for Acoustic Elements of Railway Sound Barrier (TB / T 3122-2010) that denoising coefficient is not less than 0.70 when train operation velocity is 200 km / h and above.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a cement-based railway sound barrier sound-absorbing material and a preparation method thereof. Background technique [0002] At present, the total level of railway noise in my country has long been higher than 80dB, which has brought serious noise pollution problems. For railway noise control, the common practice at home and abroad is to set up sound barriers and / or install sound-absorbing materials to improve the sound environment of trains. When the high-speed train is running, the main noise frequency band is 80Hz~1000Hz, and its main peak frequency is concentrated in 800Hz~1000Hz. Studies have shown that in the design of sound barriers, the use of corresponding sound-absorbing materials with high sound absorption coefficients for different noise frequencies can alleviate the problem of noise pollution in sensitive areas. Therefore, the invention of a railway s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B14/18C04B18/14
CPCC04B14/185C04B18/141C04B28/04C04B2111/0075C04B2201/20C04B2201/50C04B22/002C04B2103/302Y02W30/91
Inventor 全明徐家伟郝元麟
Owner CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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