Performance Grade System for Asphalt Binder - Graniterock
The most advanced asphalt binder grading system is Performance Graded (PG) System, which is resulted from the $50 million Strategic Highway Research Program (SHRP) and has been adopted by all of the other 49 states in the U.S. In the past, Caltrans has classified binder using viscosity grading based on Aged Residue (AR) System.