Abstract
This paper presents simulation results of Asphalt Concrete (AC) Flow Number (FN) properties. It utilizes the Discrete Element Method (DEM) technique to simulate the microstructure of three ACs captured using X-ray Computed Tomography (CT). These three mix designs (coarse-graded, gap-graded, and fine-graded) prepared with hard limestone aggregate and a PG 76-22 modified binder were included in the study. Advanced digital image processing techniques were utilized to process the X-ray CT images and to suitably input their microstructure into the DEM model. The viscoelastic rheological properties of the asphalt mastics were defined by fitting Burger model parameters on frequency sweep test data conducted at 60 °C. The DEM simulation, in two-dimensions, involved modeling the unconfined FN tests under a repeated stress of 690 kPa. The simulation loading was applied for 0.1 second followed by a 0.9 seconds rest period until 10,000 load cycles or 5 % accumulated strain was reached. The 2D DEM simulation results appear to capture the significant differences in FN properties between these three AC mixtures and hence can be used to compare their rutting susceptibility.
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Zelelew, H., Mahmoud, E., Papagiannakis, A.T. (2013). Micromechanical Simulation of the Permanent Deformation Properties of Asphalt Concrete Mixtures. In: Kringos, N., Birgisson, B., Frost, D., Wang, L. (eds) Multi-Scale Modeling and Characterization of Infrastructure Materials. RILEM Bookseries, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6878-9_31
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DOI: https://doi.org/10.1007/978-94-007-6878-9_31
Publisher Name: Springer, Dordrecht
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