Materials and Structures

, Volume 48, Issue 8, pp 2417–2430 | Cite as

Imaged-based discrete element modeling of hot mix asphalt mixtures

  • Mohammad J. Khattak
  • Ahmed Khattab
  • Hashim R. Rizvi
  • Subasish Das
  • Mohammad R. Bhuyan
Original Article

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.

Keywords

Micro-mechanical model PFC2D HMA Compressive strength Discrete element model Constitutive behavior Carbon nanofibers 

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Copyright information

© RILEM 2014

Authors and Affiliations

  • Mohammad J. Khattak
    • 1
  • Ahmed Khattab
    • 2
  • Hashim R. Rizvi
    • 1
  • Subasish Das
    • 1
  • Mohammad R. Bhuyan
    • 1
  1. 1.Department of Civil EngineeringUniversity of Louisiana at LafayetteLafayetteUSA
  2. 2.Department of Industrial TechnologyCollege of Engineering, University of Louisiana at LafayetteLafayetteUSA

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