Thermodynamic-based model for coupling temperature-dependent viscoelastic, viscoplastic, and viscodamage constitutive behavior of asphalt mixtures

Masoud K. Darabi, Rashid K.Abu Al-Rub, Eyad A. Masad, Dallas N. Little

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

Based on the continuum damage mechanics, a general and comprehensive thermodynamic-based framework for coupling the temperature-dependent viscoelastic, viscoplastic, and viscodamage behaviors of bituminous materials is presented. This general framework derives systematically Schapery-type nonlinear viscoelasticity, Perzyna-type viscoplasticity, and a viscodamage model analogous to the Perzyna-type viscoplasticity. The resulting constitutive equations are implemented in the well-known finite element code Abaqus via the user material subroutine UMAT. A systematic procedure for identifying the model parameters is discussed. Finally, the model is validated by comparing the model predictions with a comprehensive set of experimental data on hot mix asphalt that include creep-recovery, creep, uniaxial constant strain rate, and repeated creep-recovery tests in both tension and compression over a range of temperatures, stress levels, and strain rates. Comparisons between model predictions and experimental measurements show that the presented constitutive model is capable of predicting the nonlinear behavior of asphaltic mixes under different loading conditions.

Original languageBritish English
Pages (from-to)817-854
Number of pages38
JournalInternational Journal for Numerical and Analytical Methods in Geomechanics
Volume36
Issue number7
DOIs
StatePublished - May 2012

Keywords

  • Bituminous materials
  • Continuum damage mechanics
  • Finite element implementation
  • Thermodynamics
  • Viscodamage
  • Viscoelasticity
  • Viscoplasticity

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