Acoustical ageing of low noise pavements expressed by different measuring techniques

Abstract

Low noise asphalt pavements are being implemented more often in colder climate regions. However, main disadvantage of low noise pavements is sensitivity to severe climate conditions (freeze-thaw, large temperature fluctuations) resulting in shorter acoustical and structural lifetime. This paper presents research study which main focus was to analyse acoustical and structural properties ageing/degradation of optimized low noise asphalt mixtures (SMA 5 TM, SMA 8 TM and TMOA 5) and porous asphalt (PA 8) on the real trafficked road sections. In depth analysis of CPX noise levels, SPB noise levels and sound absorption measurements, performed multiple times in a 2 years’ period (after construction), is given and explained in the paper. Paper concludes with the acoustical and structural ageing trends for selected asphalt mixtures and recommendations for low noise asphalt pavements maintenance actions in order to extend their lifetime.