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Imaged-based discrete element modeling of hot mix asphalt mixtures

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Abstract

This paper presents the development of micro-mechanical discrete element model for hot mix asphalt (HMA) mixtures modified with carbon nanofibers using the advanced imaging techniques. Shape-structural model of two-phased HMA consisting of aggregate and matrix was generated using cluster of small discrete disk-shaped particles for each phase. Three contact models, shear and normal stiffness, static and sliding friction, and inter-particle contact bonds were employed to model the constitutive behavior of the HMA mixture. To validate the developed DEM model an experimental study was executed. It was observed that the uniaxial compressive test simulation reasonably predicted the stress–strain behavior of the HMA mixture. The dynamic modulus and strength obtained from indirect tensile test were similar to the predicted moduli and strength using the DEM under the quasi-elastic state for all the HMA mixtures studied.

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Acknowledgments

The authors wish to express their sincere thanks to the University of Louisiana at Lafayette for using their facility and financial support. Special thanks are also extended to Mr. Mark Leblanc, laboratory assistant for assisting in experimentations.

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Authors and Affiliations

  1. Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA, USA

    Mohammad J. Khattak, Hashim R. Rizvi, Subasish Das & Mohammad R. Bhuyan

  2. Department of Industrial Technology, College of Engineering, University of Louisiana at Lafayette, Lafayette, LA, USA

    Ahmed Khattab

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  1. Mohammad J. Khattak
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  2. Ahmed Khattab
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  3. Hashim R. Rizvi
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  4. Subasish Das
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Correspondence to Mohammad J. Khattak.

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Khattak, M.J., Khattab, A., Rizvi, H.R. et al. Imaged-based discrete element modeling of hot mix asphalt mixtures. Mater Struct 48, 2417–2430 (2015). https://doi.org/10.1617/s11527-014-0328-1

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  • DOI: https://doi.org/10.1617/s11527-014-0328-1

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