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Coatings 2016, 6(2), 15; doi:10.3390/coatings6020015

Noisiness of the Surfaces on Low-Speed Roads

Division of Road Engineering, Faculty of Civil and Environmental Engineering, Bialystok University of Technology, Wiejska St. 45E, 15-351 Bialystok, Poland
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Academic Editor: Elisabete Fraga de Freitas
Received: 29 February 2016 / Revised: 17 March 2016 / Accepted: 22 March 2016 / Published: 25 March 2016
(This article belongs to the Special Issue Low-Noise Road Surfaces)
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Abstract

Traffic noise is a particular threat to the environment in the vicinity of roads. The level of the noise is influenced by traffic density and traffic composition, as well as vehicle speed and the type of surface. The article presents the results of studies on tire/road noise from passing vehicles at a speed of 40–80 kph, carried out by using the statistical pass-by method (SPB), on seven surfaces with different characteristics. It has been shown that increasing the speed from 40 kph to 50 kph contributes to the increase in the maximum A-weighted sound pressure level by about 3 dB, regardless of the type of surface. For larger differences in speed (30 kph–40 kph) increase in noise levels reaches values about 10 dB. In the case of higher speeds, this increase is slightly lower. In this article, special attention is paid to the noisiness from surfaces made of porous asphalt concrete (PAC), BBTM (thin asphalt layer), and stone mastic asphalt (SMA) with a maximum aggregate size of 8 mm and 5 mm. It has also been proved that surfaces of porous asphalt concrete, within two years after the commissioning, significantly contribute to a reduction of the maximum level of noise in the streets and roads with lower speed of passing cars. Reduction of the maximum A-weighted sound pressure level of a statistical car traveling at 60 kph reaches values of up to about 6 dB, as compared with the SMA11. Along with the exploitation of the road, air voids in the low-noise surface becomes clogged and acoustic properties of the road decrease to a level similar to standard asphalt. View Full-Text
Keywords: road surface; tire/road noise; statistical pass-by (SPB) method road surface; tire/road noise; statistical pass-by (SPB) method
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gardziejczyk, W.; Gierasimiuk, P.; Motylewicz, M. Noisiness of the Surfaces on Low-Speed Roads. Coatings 2016, 6, 15.

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