EVALUATION OF NOISE REDUCTION OF ASPHALT RUBBER IN URBAN AREAS

The paper introduces the main parameters for development and testing a specific methodology for the acoustical performance measurement of Asphalt Rubber hot mixtures in urban scenarios. The statistical bass-by (SPB) measurements in urban sites, where vehicle speeds are low and traffic flows are not regular, do not correspond to the requirements of ISO 11819 and can neither be easily replaced by other methods like close proximity (CPX) method or measurement of noise at receivers. This research was inspired by a need for a robust acoustic testing method in urban areas. A new approach, derived by an adaptation of SPB to urban scenarios, is presented here, as a general method for the evaluation of an acoustic efficiency provided by low noise pavements. It was defined and tested by the authors in some different urban scenarios where traffic noise was identified as the main source of annoyance of residents. As the most relevant result of the study, a new, more general, methodology for the acoustical performance testing of asphalt surface layers, valid for all types of hot mixtures, was developed and described.

Autori: Antunes, Borchi, Luzzi, Miljkovic