A Numerical Implementation of the Three-Dimensional Viscoelastic Model for Asphalt Mastic

This paper presents a numerical implementation of the three-dimensional viscoelastic model to describe the behavior of asphalt mastic. Details of the numerical viscoelastic constitutive formulation implemented in a finite element code are presented and illustrated. Then, uniaxial tensile tests and torsion tests were conducted to determine the viscoelastic constitutive parameters at a temperature of 20 degrees C. Both the capability of the model and the accuracy of the parameter determination of the displacement-based constitutive numerical model were examined by comparing the numerical predictions with the observed laboratory tests under two basic loading paths. The presented results show that the numerical predictions exhibit a rather good agreement with the experimental results for three primary modes of bending and compression loading. Therefore, the presented numerical implementation of constitutive model may be appropriate for describing the mechanical behavior of asphalt mastic when the viscoelastic constitutive parameters became available.