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.
Original language | English |
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Pages (from-to) | 119-130 |
Number of pages | 12 |
Journal | International Journal of Geomechanics |
Volume | 7 |
Issue number | 2 |
DOIs | |
Publication status | Published - Mar 2007 |
Externally published | Yes |
Keywords
- Anisotropy
- Asphalt mixes
- Damage
- Deformation
- Finite element method
- Mapping
- Microstructures
- Viscoplasticity