Highway Research Record

VI. RESEARCH WORK DONE IN ACADEMIC INSTITUTIONS RELATED TO THESIS WORK
B. PAVEMENT ENGINEERING AND PAVING MATERIALS
Micromechanical Analysis of Asphalt Mix

Date of Start:May 2004
Indian Institute of Technology, Kanpur (R, I)

Scope and Objective
In this study, a Finite Element Method (FEM) based model is developed and validated experimentally to predict the behaviour of asphalt mix and study the effect of different factors such as composition, aggregate shape and size, and property of binder on the overall behaviour of asphalt mix. Actual cross-sectional images of the asphalt mix sample are used, so that the irregular shape of the aggregates can be taken into account in the modeling.

Methodology
Asphalt mix is modeled with original aggregate shape from cross sectional images and analyzed using a commercial Finite Element (FE) software ABAQUS. Synthetic samples with random distribution of elliptical aggregates to desired compaction are also analyzed with the FE software. The numerical results are compared with experimental results performed on asphalt mix.

Findings and Conclusions

It can be concluded that the volume fraction composition of asphalt mix is not the sole property deciding factor of the mix. The numerical model can well predict the property of the mix given its morphology and property of the components.