Visco-elasto-plastic modelling of asphalt concrete pavement under construction
Most of the research carried out in the field of asphalt concrete pavement has neglected the viscous and plastic characteristics of the asphalt concrete mixes assuming that the asphalt concrete mixes behave as a linear elastic material. Although this assumption may be acceptable in studying the behavior of the asphalt concrete mix in service, this is not the case when studying the asphalt concrete characteristics during the compaction process. Recently, a new approach has been developed affirming the importance of considering the viscous characteristics of the asphalt mix during compaction process. This approach simulates the compaction process using the consolidation theory used for fine-grained soil. By applying the compaction load, the aggregate particles are reoriented closer together aided by the bituminous material coating them. To achieve the required density, the compaction load should be applied on the asphalt concrete mix for a sufficient time and at a high temperature (i.e., low bitumen viscosity). This approach was verified through a number of field tests in Canada and Australia. This paper compliments this research effort by developing a non-linear finite element model (FEM) to simulate the compaction process of the flexible pavement in the field. The characteristics of the asphalt concrete layer as a visco-elasto-plastic material were discussed and included in the model. The preliminary results of the developed model indicate that ignoring the visoc-elasto-plastic characteristics of the asphalt concrete layer can significantly affect the results.
|Conference||2000 Annual Conference - Canadian Society for Civil Engineering|
Kandil, K. (K.), Hassan, Y, Halim, A.O, & Easa, S. (S.). (2000). Visco-elasto-plastic modelling of asphalt concrete pavement under construction. In 2000 Annual Conference Abstracts - Canadian Society for Civil Engineering.