Modeling Asphalt Pavement Rutting under Accelerated Testing

ABSTRACT This paper presented a developed mechanistic-empirical (ME) model for simulating the rutting depth of asphalt pavements under the accelerated testing. This model is based on the power law of vertical strain, and it empirically correlates the layer rutting depth to the cyclic deflection. The total rutting depth is an integration of permanent deformation of each layer at different loading history period, and the layer deflection is determined by the finite element (FE) modeling. The layer interface is simulated by the surface-to-surface contact model, assuming that there is no normal separation but frictional sliding is allowed at the interface. The permanent deformation parameters are determined by the laboratory repeated loading tests on cylindrical specimens, in which the applied deviatoric stress levels can be estimated using the multi-layered or FE program to simulate the stress state of in-situ pavements. The ME model was implemented utilizing the field test under the accelerated-loading-facility (ALF) testing, and results have shown reasonable agreements between the modeled rutting depths and measurements. Thickness and modulus of pavement layer have significant influences on rutting depth based on this ME model.

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