Viscoelastic-based finite element rutting predictive models for asphalt pavements

Rutting is one of the most important distresses in asphalt concrete pavements. It is typically caused by consolidation or lateral movement of the materials (reorientation of aggregate particles) due to traffic loading in a hot climate. The ability to predict rutting depth in asphalt concrete pavements is an important aspect of pavement design. In this study, two different finite element models were created using ABAQUS software to predict the mechanical rutting behavior and performance of asphalt concrete pavements. In the first model, a linear elastic behavior was assumed for all layers in all pavement sections. In the second model, a viscoelastic behavior was assumed for the asphalt layer and a linear elastic behavior for all other layers. The finite element models (FEM) were calibrated and verified by comparing the proposed models' predictions with the multilayered theory results, and the available field measurement of pavement response obtained from the Heavy Vehicle Simulator (HVS) at Richmond Field Station. A significant level of accuracy was found in the viscoelastic model compared to the available field measurement of pavement response obtained from the Heavy Vehicle Simulator (HVS) at Richmond Field Station while the linear elastic model represents an accurate simulation of the multilayer elastic theory.