Imaged-based discrete element modeling of hot mix asphalt mixtures

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• 作者：Mohammad J. Khattak ; Ahmed Khattab ; Hashim R. Rizvi…
• 关键词：Micro ; mechanical model ; PFC2D ; HMA ; Compressive strength ; Discrete element model ; Constitutive behavior ; Carbon nanofibers
• 刊名：Materials and Structures
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：48
• 期：8
• 页码：2417-2430
• 全文大小：2,979 KB
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• 作者单位：Mohammad J. Khattak (1)
  Ahmed Khattab (2)
  Hashim R. Rizvi (1)
  Subasish Das (1)
  Mohammad R. Bhuyan (1)
  
  1. Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA, USA
  2. Department of Industrial Technology, College of Engineering, University of Louisiana at Lafayette, Lafayette, LA, USA
  
• 刊物类别：Engineering
• 刊物主题：Structural Mechanics
  Theoretical and Applied Mechanics
  Mechanical Engineering
  Operating Procedures and Materials Treatment
  Civil Engineering
  Building Materials
  
• 出版者：Springer Netherlands
• ISSN：1871-6873

文摘

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.