Reclaimed Porous Asphalt Pavement Used as Aggregate in Cement Bound Concrete Pavement

In the Netherlands reclaimed asphalt pavement is normally used as cold aggregate to produce recycled hot asphalt mixtures. However reclaimed asphalt pavement originating from porous asphalt pavement can not be used in this process. Therefore it would be valuable if these residual aggregates could be used in concrete production. A preliminary investigation on Portland cement concrete containing reclaimed porous asphalt pavement (RPAP) as aggregates was conducted. Trial mixtures, with RPAP contents of 0, 10, 20, 30 and 40 volume percent of the total aggregates, had good workability. Strength decreased with increasing RPAP content. Two mixtures with 0 and 40% RPAP were chosen for further investigation based on a demo project. Two test areas were constructed consisting of cement bound concrete pavement with and without RPAP. From both mixtures additional specimens were cast for laboratory investigation. Concrete containing RPAP has lower strength and modulus of elasticity, higher shrinkage and comparable freeze-thaw resistance as concrete without RPAP.