Results to date (Fall 1996) from the Caltrans Accelerated PavementTesting (CAL/APT) Program are discussed and include those forthe Phase I program and initial results from the Phase II program.

The Phase I program involved a study of the comparative performanceunder Heavy-Vehicle-Simulator (HVS) loading of Caltrans dense-gradedasphalt concrete (DGAC) and asphalt-rubber, hot mix, gap-graded(ARHM-GG) as overlays on a fatigue-cracked asphalt pavement andan evaluation of pavement rutting from channelized traffic resultingfrom simulated Automated Vehicle Control Systems (AVCS).

The initial part of the Phase II program includes an evaluation,under HVS-loading, of the performance of two pavements, one containingan asphalt-treated permeable base (ATPB) and the other an aggregatebase (AB), designed and constructed according to Caltrans procedures.The HVS testing of pavements for the Phase I program was performedin South Africa while the Phase II program is being conductedat the University of California at Berkeley (UCB) Richmond FieldStation.

Laboratory tests have been performed for both phases at UCBinvolving evaluations of the stiffness and permanent deformationcharacteristics of the various pavement components and fatiguecharacteristics of the asphalt mixes. These results have beenused to analyze the performance of the HVS-loaded pavements.

By combining the results of both the HVS and laboratory tests,interpretations of pavement performance are described and recommendationsfor pavement design and construction have been made to Caltrans.