Effect of the Realistic Tire Contact Pressure on the Rutting Performance of Asphaltic Concrete Pavements

다국어 초록 (Multilingual Abstract)

The effect of different configurations of normal contact stresses on the rutting performance of asphalt concrete overlays on a softand stiff Crushed Aggregate Base (CAB) layer is investigated. A three-dimensional (3-D) finite element model of a pavementstructure is generated. The effect of different types of simplified normal contact stresses and a realistic 3-D normal stress on therutting performance is investigated. Since the failure mechanism of asphaltic materials at high temperature is mainly related to theflow of the material, the viscoelastic and viscoplastic constitutive relationships coupled with the hardening-relaxation mechanismsare utilized to represent the behavior of asphalt concrete layer. This constitutive relationship is part of the PANDA (PavementAnalysis using Nonlinear Damage Approach) model developed by the authors and their collaborators. As the result of simulation, themagnitude of the rut depth on the asphalt concrete layer is generally determined to be inversely proportional to the stiffness of theCAB layer, and the rut depth on the asphalt concrete layer under the realistic 3-D normal stress is about 1.5 times greater than the rutdepth under uniformly distributed normal stress.

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