3D Constitutive Model for Asphalt Pavements

Abstract

The deformation behaviour of asphalt is modelled in the present work with the aid of so-called rheological elements. A special element (HOOK-, KELVIN-, Newton-element) is assigned to each deformation contribution (elastic, visco-elastic, visco-plastic). Non-monotonic damage-healing processes are described phenomenologically and taken into consideration with the aid of a newly-developed damage-healing element. The rheological elements are dependent on free values; these permit the computation of deformation increases. Under the assumption of small deformations the contributions to the deformation increases are summated. This results in an elastoplastic material model. This material model exists in a differential form in one and three-dimensional configuration and is converted into an algorithm for implementation in a computational model.

Keywords:

• Material behaviour of asphalt
• Constitutive model
• Rheological elements
• Damage and healing