Many researchers have asserted the importance of considering the nonlinearity of the mechanical behavior of asphalt binders for accurately estimating their performance under field conditions, and for comparing and ranking them accordingly. To do so, it is necessary to have a robust and reliable nonlinear viscoelastic theory and a model derived under its purview that can describe the mechanical response of asphalt binders reasonably well. The objective of this study is to develop such a model. A new Gibbs-potential–based thermodynamic framework is used for this purpose. The model developed in this paper is a generalization of the Oldroyd-B model. It is used successfully to describe results of several experiments from the literature concerning the nonlinear response of asphalt binders, including nonlinear creep-recovery and stress-relaxation behavior, thinning behavior, and the appearance of normal forces perpendicular to the plane of shear in simple shear tests.
Nonlinear Viscoelastic Model for Describing the Response of Asphalt Binders within the Context of a Gibbs-Potential–Based Thermodynamic Framework
Journal of Materials in Civil EngineeringSeptember 2012
Journal of Materials in Civil EngineeringAugust 2011
Assistant Professor, Dept. of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India; formerly, Ph.D. Candidate, Dept. of Civil Engineering and Texas Transportation Institute, Texas A&M Univ., College Station, TX 77843-3135. E-mail: [email protected]
Regents Professor, Dept. of Civil Engineering and Texas Transportation Institute, Texas A&M Univ., College Station, TX 77843-3135. E-mail: [email protected]
Received: August 18, 2012
Accepted: June 07, 2013
Published online: June 11, 2013
© 2014 American Society of Civil Engineers.