Comparison of Rutting Resistance of Asphalt Pavements with Different Asphalt Mixtures

The main objective of this study was to compare the rutting resistance of asphalt pavements with different asphalt mixtures used in the middle and bottom asphalt layers. The uniaxial compression test, uniaxial repeated load creep test and the rutting depth simulation were conducted. The results showed that the modified asphalt pavement structure (SBS and PR composite modified AC-20 mixture was used in the middle asphalt layer and BRA modified Superpave-25 mixture was used in the bottom asphalt layer) had the smallest rutting depth. Compared to the control pavement structure (the middle asphalt layer was AC-20 mixtures using Pen 70 asphalt and the bottom asphalt layer was Superpave-25 using Pen 70 asphalt), the rutting depth of the modified asphalt pavement structure could be reduced by 14.5%. The middle asphalt layer indicated the largest percentage in the sum of permanent deformation, the bottom asphalt layer followed it and the last was the upper asphalt layer, which might be resulted from the different shear stresses in different asphalt layers.