ADAPTING SUPERPAVE TECHNOLOGY TO DESIGN OF HOT RECYCLED MIXES

Mix design procedures for recycled asphalt pavements require the selec tion of virgin asphalt binder or recycling agent and recycled hot mix asphalt (HMA) mix design. This research project was undertaken (a) to develop a procedure for selecting the performance grade (PG) of virgin asphalt binder based on the Superpave PG grading system and (b) to de sign hot recycled mix using Superpave technology. Blending charts were constructed and used to select the PG grade of virgin asphalt binder for mixes with 0, 20, 30, and 40 percent of recycled asphalt pavement material (RAP). Superpave volumetric mix design were conducted on mixe s with 0, 20, 30, and 40 percent RAP. Evaluation of the volumetric pro perties of these mixes has indicated that the Superpave volumetric mix design procedures can be adapted to design recycled HMA mixtures with minimal modification.