PERMANENT DEFORMATION AND FATIGUE EVALUATION OF ASPHALT CONCRETE MIXES

This paper briefly summarizes experiences with the use of SHRP-developed shear and fatigue test equipment for mix analysis and design over about an 8-year period since their development. A summary of experience with the shear test includes: 1) mix designs for two Interstate pavements; 2) analysis of mix rutting in accelerated pavement tests; and 3) mix design criteria development from a forensic study of pavement performance. Similarly, for the fatigue test, examples referred to include: 1) mix cracking in accelerated test pavements; 2) structural section design for an Interstate pavement subjected to 200 x 10 power 6 ESALs; and 3) evaluation of fatigue criteria in current PG specifications. Guidelines, based on these experiences, are provided for the use of these tests in mix design and structural pavement design and analysis and include specific recommendations for test specimen preparation. For the covering abstract see ITRD E117423.