Abstract
This study investigates the relationships between shape and size characteristics of aggregates and the creep and recovery behavior of a hot-mix asphalt concrete. A geometric and computational model is developed and calibrated to simulate the creep and recovery tests. It combines viscoelastic and elastic properties of the materials to construct a HMA sample. The model requires an algorithm to randomly generate the particles particle packing considering their shape, sizes and volume occupation of the samples. After validation, the model is used to establish parametric relationships between shape indices and maximum displacement. The results showed good correlations between shape factor and sphericity with the maximum displacement at the end of the loading time. Cubic particles showed less resistance to displacement than the flat and elongated ones. Also, from grain size distribution analysis, it is demonstrated that bigger particles and denser mixtures increase rigidity and resistance to permanent deformation.
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