Recycling Construction and Demolition Waste as Aggregate in Porous Asphalt Pavement for Urban Stormwater Management

This paper investigates the viability of recycling construction and demolition waste as aggregate in porous asphalt pavement for stormwater runoff management. The influence of granulometric composition, recycled aggregate content (0%, 12.5%, 25%, and 37.5%), and binder content (4% to 6%) was investigated. A comprehensive characterization to identify the minimum binder content that might ensure a suitable hydraulic conductivity with minimum influence in the mechanical properties and moisture-induced damage was performed. The tested mixtures presented suitable particle loss, tensile strength, moisture-induced damage, and hydraulic conductivity for application as porous asphalt mixture for urban stormwater runoff management. The use of recycled aggregate resulted in acceptable air voids content only in mixtures produced with a binder content of 4.5%. The porous asphalt mixture produced with granulometric composition GC3, 25% recycled aggregate, and 4.5% asphalt binder could be potentially used for the intended application in stormwater runoff management.