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

• Published in: International journal for numerical and analytical methods in geomechanics Vol. 36; no. 7; pp. 817 - 854
• Main Authors: Darabi, Masoud K., Al-Rub, Rashid K. Abu, Masad, Eyad A., Little, Dallas N.
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.05.2012; Wiley
• Subjects: Applied sciences; Bitumen. Tars. Bituminous binders and bituminous concretes; bituminous materials; Buildings. Public works; Computation methods. Tables. Charts; continuum damage mechanics; Exact sciences and technology; finite element implementation; Materials; Structural analysis. Stresses; thermodynamics; viscodamage; viscoelasticity; viscoplasticity; Constitutive equation; Viscoelasticity; viscodamage; Construction materials; Measurement result; Forecast model; Modeling; Finite element method; Thermodynamics; Asphalt; bituminous materials; continuum damage mechanics; finite element implementation; Viscoplasticity; Continuum mechanics; Application; Bituminous mixture; Damaging
• ISSN: 0363-9061; 1096-9853
• DOI: 10.1002/nag.1030

SUMMARY 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. Copyright © 2011 John Wiley & Sons, Ltd.