The Recycling Supplement to Superpave
Report 452: Recommended Use of Reclaimed Asphalt Pavement in the Superpave Mix Design Method: Technician's Manual

As Superpave took its place in the 1990s as the leading method for asphalt mix design, transportation agencies needed to know how to incorporate reclaimed asphalt pavement (RAP) into the new design process. The NCHRP research and guidelines that followed still provide definitive answers a decade after publication.