Rutting of hot mix asphalt pavements has been increased in recent years due to increased number of heavy vehicles. Using large stone asphalt mixes increases stability, shear resistance and the rutting resistance of hot mix asphalt (HMA) pavements. Large stone asphalt mixes (LSAMs) are defined as HMA paving mixtures containing nominal maximum aggregate sizes between 25 and 63 mm. In this experimental work the modified Marshall mix design method according to ASTM-D5581 is used for design of these mixtures. The rutting resistance of LSAM mixes were evaluated and compared to conventional HMA mixtures. Large stone asphalt mixes designed with four different gradations and were evaluated. The stone to stone contact of these mixtures was determined using dry rodded density test according to AASHTO T19. Rutting specimens were prepared at four asphalt contents for large stone asphalt mixes and at optimum asphalt content for a conventional mixture. The rut depth of specimens was obtained at 12000 loading cycles. The effect of various parameters such as asphalt content, air voids, gradation and stone to stone contact of large size aggregate on rutting resistance was evaluated using wheel tracking rutting tester. (a) For the covering entry of this conference, please see ITRD abstract no. 0612AR242E.
Samenvatting