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Development of an Elastoviscoplastic Microstructural-Based Continuum Model to Predict Permanent Deformation in Hot Mix Asphalt |
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| Authors: | Eyad Masad Samer Dessouky Dallas Little |
| Affiliation: | 1Associate Professor, Dept. of Civil Engineering and Texas Transportation Institute, Texas A&M Univ., 3135 TAMU, College Station, TX 77843-3135 (corresponding author). 2Research Scientist, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801-2352. 3Professor, Dept. of Civil Engineering and Texas Transportation Institute, Texas A&M Univ., 3135 TAMU College Station, TX 77843-3135. |
| Abstract: | Permanent deformation in hot mix asphalt is caused by a combination of densification (decrease in volume and hence increase in density) and shear deformation. The primary objective of this paper is to develop an elastoviscoplastic model that accounts for the influence of important microstructure properties such as anisotropy and damage on permanent deformation. The model incorporates a yield surface based on the Drucker-Prager function that is modified to capture the influence of stress state on the material response. Also, parameters that reflect the directional distribution of aggregates and damage density in the microstructure are included in this yield surface model. The elastoviscoplastic model is converted into a numerical formulation and is implemented in finite element (FE). The FE model is used in this study to simulate experimental measurements under different confining pressures and strain rates. |
| Keywords: | Anisotropy Asphalt mixes Damage Microstructures Finite element method Mapping Viscoplasticity Deformation |
