Widening of Concrete Roads with Porous Concrete Bases

This paper assesses the condition of a concrete motorway pavement in the Paris region to be widened from three to four lanes from the outside. The sigilificant drainage requirements of the existing pavement led to the provision of a new porous pavement. The design criteria applied for the typical crosssection of the widening are described, along with the different project phases, with photographic illustrations and comments.