Concrete base sound absorption material for road sound screen and method of manufacturing the same

Abstract

The invention relates to a cement-matrix sound-absorption material used in road noise barriers and a preparation method thereof; the sound-absorption material is a noise barrier material which can be used in airports, high-speed railways, expressways, urban viaducts, subways and light rails; the components and weight ratios are as follows: 15.4 to 62.3 percent of Portland cement, 0.1 to 15.7 percent of mineral admixture, 18.9 to 79.9 percent of lightweight porous aggregate, 0.013 to 0.078 percent of foaming agents, 0.1 to 0.7 percent of water reducing agent and 0.4 to 2.6 percent of fiber. The sound-absorption material and the preparation method thereof have the advantages of large sound absorption coefficient, high strength, good anti-impact performance, excellent durability, fire resistance, moisture resistance, anti-corrosion and self-clean function; at the same time, the sound-absorption material is wide in sources of raw materials, convenient in preparation and processing, suitable for large-scale production, low in cost, environment-friendly and good in decorativeness.

Description

technical field [0001] The invention relates to a novel cement-based porous sound-absorbing material, in particular to a sound-absorbing sound barrier material used in airports, high-speed railways, expressways, urban viaducts, subways and light rails. Mainly used in transportation and aviation fields. Background technique [0002] With the rapid development of my country's economy and the rapid advancement of urbanization, in recent years, the construction of airports, high-speed railways, expressways, subways, urban elevated roads and urban light rails has developed rapidly, the number of urban motor vehicles has increased sharply, and traffic noise pollution It is deteriorating day by day, and has become the fourth most serious and extensive pollution affecting people's lives after air pollution, water pollution and solid waste pollution. Controlling noise pollution has become an urgent problem to be solved. At present, among various measures to prevent and control traffi...

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Problems solved by technology

[0004] After searching the existing literature, it was found that Huang Xuehui and Shang Fuliang of Wuhan University of Technology wrote an article "Development of Sound-absorbing Materials for Noise Reduction in Highway Tunnels" in Volume 25 of "Journal of Wuhan University of Technology", 2003, P 27-30. A cement-based expanded perlite porous sound-absorbing material has been developed in the laboratory, but the developed cement-based expanded perlite porous sound-absorbing material has small sound absorption coefficient, low strength, and poor durability. Rapid failure under repeated wind pressure fatigue, under normal circumstances, all parts need to be replaced once less than a year, resulting in serious economic losses; in addition, limited by the porous material itself, the medium The sound absorption efficiency in the low frequency band is low (the sound absorption coefficient is 0.1-0.2), and the sound absorption performance is unstable; in addition, the cement-based expanded perlite porous sound-absorbing material without hydrophobic treatment has poor waterproof performance and low weather resistance. In the process of outdoor use, the sound absorption effect and strength will quickly degrade under the effects of wind, rain, carbonization, ultraviolet radiation, etc.

The above-mentioned shortcomings severely limit the large-scale and extensive application of cement-based porous sound-absorbing materials in the transportation field.

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