Abstract
Few studies have investigated pavement damage resulting from different axle and truck configurations, and they were generally limited to single and tandem axles. The unconfined compression cyclic load test with loading-cycles. that simulate different axle and truck-configurations. was used to examine their relative effect on permanent deformation of air asphalt mixture. The laboratory investigation indicates that the rutting damage due to different axle configurations is approximately proportional-to the number of axles. However, the effect of rest period between axles groups within a truck configuration is significant. Calculating-truck-rutting damage by simply summing the vertical permanent deformation corresponding, to its constituent axle groups results in erroneous-predictions. The application of Miner's rule results in improved truck rutting damage predictions for a wider range of truck configurations, although it does not account-for the effect of rest periods within a truck configuration Finally, unique HMA rutting damage curves, which can be used for any axle or truck configuration, were developer) using strain and energy response parameters.