Abstract
Different ways to include aggregates in a hot mix asphalt concrete numerical model are investigated in this paper. Some geometrical approaches are adopted in order to evaluate their precision and efficiency. Packings of platonic solids are generated randomly, considering the average dimensions of real aggregates. In a complex method, 3D-scanned particles are used to generate meshes in random positions, to represent a more realistic shape approximation. The models consider the real shape indices, sizes and volume occupations of the sample. The construction of the virtual samples is presented in this paper. Creep and recovery tests were simulated with a finite element method (FEM) software and showed good agreement with experimental results. The virtual samples were validated using experimental data, so they could be used to stablish parametric correlations. The consideration of real aggregates shapes made the model very complex, but it was possible to evaluate the influence of different shapes of aggregates on creep behavior of asphalt mixtures.
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