Assessment of asphalt concrete acoustic performance in urban streets.
Geo-referenced close proximity rolling noise and sound absorption measurements are used for acoustical characterization of asphalt concrete surfaces in an urban environment. A close proximity noise map of streets with low speed limits is presented for a reference speed of 50 km/h. Different pavements and pavement conditions, common in urban streets, are analyzed: dense and semidense asphalt concrete, with Spanish denomination D-8 and S-12, respectively, and on the other hand, dense pavement at the end of its service life (D-8(*)). From the acoustics point of view, the most favorable surface, by more than 4 dB(A) compared with the S-12 mix, is the smoothest surface, i.e., the D-8 mix, even though it presents a minor absorption coefficient in normal incidence. Noise levels from dense surfaces (D-8) increase significantly over time, principally due to the appearance of surface defects such as cracks and ruts. Longitudinal variability of the close proximity tire/pavement noise emission and surface homogeneity are also analyzed.
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Laboratory of Acoustics Applied to Civil Engineering (LA2IC), Department of Applied Physics-ETSI Caminos and ES Informática, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain. santiago.exposito@uclm.es
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D000162:Acoustics; D004777:Environment; D006838:Hydrocarbons; D008962:Models, Theoretical; D009622:Noise; D014506:Urban Renewal
D006838:Hydrocarbons; C006647:asphalt