New life for Porous Asphalt RAP in new Porous Asphalt

F. Elzinga ; Van Gelder, J. Voskuilen ; Ministerie van Infrastructuur en Milieu, Rijkswaterstaat, Dienst Verkeer en Scheepvaart (RWS, DVS)


Since 1987 Porous Asphalt (PA) is used in special cases in the Netherlands with the focus on traffic safety, but since 1990 PA is the standard wearing course because of noise reduction reasons. The average service lifes of standard PA are respectively for the slow and fast lane 11.8 and 16 years. The end of service life of PA is determined by loss of too many stones from the surface, called raveling. At the end of service life the old PA is milled and new PA is laid back again. In the past the PA Reclaimed Asphalt Pavement (RAP) was only reused in binder and base course layers. Since the eighties, it is standard to reuse 50% RAP in binder and base course layers. In PA and SMA it is not allowed to reuse RAP. In Dense Asphalt Concrete it was allowed to reuse RAP up to 50%, but mostly up to 20% RAP was reused, because wearing courses are more sensitive. Because in PA a high quality coarse material is used, it is a waist of money to reuse such good quality RAP in mostly binder and base course layers. Therefore a project was started to research if reuse of PA RAP in new PA was possible in such a way that the functional properties and durability of this mixture is the same as new PA. In this paper this research work will be discussed.

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Paper ISAP Nagoya 2010