A cataloguing of road pavements is proposed based on the acoustic performances of the surfacings as a function of the type of pavement, its state of maintenance and the type of degradations present. The catalogue has been compiled using data from the most recent experiments conducted by the University of Padova on tyre-road noise, evaluated with the “Close Proximity Method”. This method, which allows the reference system for the measurement of noise to be shifted from an external receptor fixed at the roadside, to one fixed on the vehicle, has allowed many types of pavements to be investigated relatively quickly and easily. The acoustic characterisation of the pavements is based on both the equivalent sound level generated by the vehicles on different pavements and on spectral distribution. This latter, equivalent level being equal, is necessary for identifying the field of frequency where the sound energy is concentrated, and therefore to characterise the greater or lesser “disturbance” caused by the noise. Frequency analysis of the components of the rolling noise also allows the combination of materials to be selected at the design stage, which satisfies, as well as the requisites of adhesion and evenness, also that of low noise. The classification regards mainly urban roads built with traditional close-textured and open-graded bituminous concrete, rehabilitation overlays, surface treatments and segmental pavings, but also includes the porous asphalt wearing courses traditionally used in extra-urban environments. The acoustic efficiency of road markings was also verified in the study. The state of maintenance was determined by both visual observation and on the basis of the surface texture level, quantified using the MPD index. The compilation of the catalogue has thrown light on the acoustic effect of the most common pavement degradations on the basis of type, seriousness and extent. This kind of evaluation represents a useful support when planning roadway construction and maintenance, especially in built-up areas.

Cataloguing road pavements on the basis of acoustic performance of the surfacings

PASETTO, MARCO;
2004

Abstract

A cataloguing of road pavements is proposed based on the acoustic performances of the surfacings as a function of the type of pavement, its state of maintenance and the type of degradations present. The catalogue has been compiled using data from the most recent experiments conducted by the University of Padova on tyre-road noise, evaluated with the “Close Proximity Method”. This method, which allows the reference system for the measurement of noise to be shifted from an external receptor fixed at the roadside, to one fixed on the vehicle, has allowed many types of pavements to be investigated relatively quickly and easily. The acoustic characterisation of the pavements is based on both the equivalent sound level generated by the vehicles on different pavements and on spectral distribution. This latter, equivalent level being equal, is necessary for identifying the field of frequency where the sound energy is concentrated, and therefore to characterise the greater or lesser “disturbance” caused by the noise. Frequency analysis of the components of the rolling noise also allows the combination of materials to be selected at the design stage, which satisfies, as well as the requisites of adhesion and evenness, also that of low noise. The classification regards mainly urban roads built with traditional close-textured and open-graded bituminous concrete, rehabilitation overlays, surface treatments and segmental pavings, but also includes the porous asphalt wearing courses traditionally used in extra-urban environments. The acoustic efficiency of road markings was also verified in the study. The state of maintenance was determined by both visual observation and on the basis of the surface texture level, quantified using the MPD index. The compilation of the catalogue has thrown light on the acoustic effect of the most common pavement degradations on the basis of type, seriousness and extent. This kind of evaluation represents a useful support when planning roadway construction and maintenance, especially in built-up areas.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11577/1363132
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