A micromechanical analysis on various asphalt mixtures generated from computer-simulated aggregate gradations was performed (Singh et al. 2011). It is expected that such a process would save a considerable time and effort while finalising a suitable gradation for the mixture design. Bruno et al. (2012) conducted a study with the purpose of finalising an effective analysis of asphalt section image for automatically extracting aggregate gradation without the need of separation of the bitumen from aggregate. A simple two-dimensional digital image processing (DIP) technique was used to obtain aggregate gradation curves for a set of 28 asphalt mixtures prepared with different asphalt binders and air voids, aggregates having various NMAS and three percentages of reclaimed asphalt pavement (RAP) (Moon 2015). In another study (Liu et al. 2017), a microstructural model of asphalt mixture generated by FEM used for uniaxial compression test was reconstructed based on X-ray CT scans, thus maintaining the original morphology of the aggregate. The results showed that the aggregated angularity significantly affects the mechanical response of the asphalt mixture. Aggregates with different angularities can be seen in Figure 7 (Liu et al. 2017), in which, 3DTS is 3D True Sphericity=πS6Vπ32. Where, S and V represent the actual surface area and actual volume of aggregate particle, respectively. These researches enriched the numerical simulation based on virtual reconstruction. Numerical simulation for selecting suitable gradation can save a considerable time and effort before conducting the gradating tests in laboratory.Figure 7. Aggregates with different angularities (Liu et al. 2017). (a) 3DTS = 0.395 (real morphology); (b) 3DTS = 0.410; (c) 3DTS = 0.425; (d) 3DTS = 0.440 (near ellipsoids).