Modelling of Acoustic Aging of Riad Surfaces

Road surfaces change their acoustic surface properties during their lifetime. Texture may increase due to stone loss or, on the other hand, may decrease due to compaction and sweating of bitumen. Open surfaces may fill with dirt leading to reduced or modified acoustic absorption and increase of flow resistivity. Where surfaces are applied to reduce environmental noise, they specifically depend on optimal surface characteristics for that function and thus are found to be especially vulnerable to surface degradation. The general unpredictability of the acoustic aging and the related uncertainty in planning of maintenance and resurfacing has limited the wide spread use of these surfaces as noise mitigation measures.