Ageing and recycling aspects of porous asphalt layers

Due to its noise reducing potential, porous asphalt (PA) is increasingly used as wearing course for the aspect of noise reduction in Germany. It isbroadly known that PA - due to its extremely hollow spaced asphalt mixture - has an increased age sensitive bitumen phase. Furthermore it shows problems in adhesion and aggregate loss caused by mechanical impacts has therefore a reduced live durability in comparison to common asphalt layers. Inconsequence, increased maintenance has to be planned. For the production of PA selected materials like high bitumen and high quality aggregates areused. On the other side the short range of maintenance leads to an increased amount of open-pored recycling asphalt from wearing courses. The essaydeals with the ageing of binder in the PA and the changes of the aggregates. Furthermore the possibilities of recycling of PA in the production of hot asphalt mixtures on a high level of value are tasked. For the coveringabstract see ITRD E157233