The APA is the second generation of Georgia loaded-wheel tester (GLWT) used in the United States for testing resistance to deformation of asphalt mixtures. The test temperature depends on the climatic data for the region where the mixture will be placed, and it is usually close to the highest expected temperature of the pavement. The test conditions include the wheel load and contact pressure, which are individually determined (usually 445 N and 690 kPa, respectively), and the number of loading cycles, 8000.
A full report about the APA can be found in the U. S. publication National Cooperative Highway Research Program Report No. 508 (Kandhal and Cooley, 2003).
