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Microstructural Viscoplastic Continuum Model for Permanent Deformation in Asphalt Pavements |
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| Authors: | Laith Tashman Eyad Masad Hussein Zbib Dallas Little Kamil Kaloush |
| Affiliation: | 1Dept. of Civil and Environmental Engineering, Washington State Univ. Pullman, WA 99164-2910. E-mail: ltashman@wsu.edu 2Dept. of Civil Engineering and Texas Transportation Institute, Texas A&M Univ., 3135 TAMU, College Station TX 77843-3135 (corresponding author). E-mail: emasad@civil.tamu.edu 3School of Mechanical and Materials Engineering, Washington State Univ., Pullman, WA 99164-2920. E-mail: zbib@wsu.edu 4Dept. of Civil Engineering and Texas Transportation Institute, Texas A&M Univ., 3135 TAMU, College Station, TX 77843-3135. E-mail: d-little@tamu.edu 5Dept. of Civil and Environmental Engineering, Arizona State Univ., P. O. Box 875306, Tempe, AZ 85287-5306, E-mail: kaloush@asu.edu |
| Abstract: | Permanent deformation is one of the major distresses in asphalt pavements. It is caused mainly by high traffic loads associated with high field temperatures. An anisotropic viscoplastic continuum damage model is developed in this study to describe permanent deformation of asphalt pavements. The model is based on Perzyna’s formulation with Drucker–Prager yield function modified to account for material anisotropy and microstructure damage. The material anisotropy is captured through microstructural analysis of aggregate distribution on two-dimensional sections of hot mix asphalt. A damage parameter is included in the model to quantify the nucleation of cracks and growth of air voids and cracks. A parametric study was conducted to demonstrate the sensitivity of the model to strain rate, aggregate distribution, and microstructure damage. Triaxial strength and static creep measurements obtained from the Federal Highway Administration Accelerated Loading Facility were used to determine the model parameters. |
| Keywords: | Viscoplasticity Damage Asphalt pavements Asphalt mixes Anisotropy Deformation Image analysis Models |