Comparing the Performanceof Hot Mix Asphalt Based Onmechanistic - Empiricalpavement Design Guide(mepdg) Against Creep Andcomputing Minimum Speed Ofheavy Vehicles
Creeps of flexible pavement are common failures in hot climates. One of the aggravating factors in this type of failure is the speed of the vehicles. This study aims to evaluate the rutting at different speeds based on Mechanistic-Empirical approach test of the AASHTO pavement structure deals. For this purpose, 48 samples of hot mix asphalt were made in accordance with the No. 5 seed based on issue 234 of Iranian code. Samples at 40 and $55^{0}C$ under stress of 100 and 200 kpa were tested, in 3 different loading times and 2 rest times. Test results and Matlab software were used to produce permanent deformation model based on the AASHTO 2002 model. As a result, the numerical model was obtained with a correlation coefficient of 0.9077. Based on the analysis carried out on the results, it was found that the most influential factor in the development of deterioration in flexible pavement is temperature and changes in loading and stress. Despite the positive effect of the increase in rest time on reducing asphalt pavement failure, this parameter can cope with the devastating effects of stress on the sample and speed deceleration of the vehicle. The growth of about 76% in the rut depth associated with increasing loading time of 100 ms to 1000 ms was observed. Finally, to reduce damage of asphaltic pavements in the tropics, minimum speed of vehicles was determined 20 kilometers per hour.
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