Mechanics of Time-Dependent Materials

, Volume 18, Issue 1, pp 197–215 | Cite as

Using the poker-chip test for determining the bulk modulus of asphalt binders

Article

Abstract

The properties of asphalt binders strongly influence the overall mechanical response of asphalt mixture composites. A thorough understanding of the mechanistic behavior of asphalt binders is important in order to fully and accurately characterize the behavior of the asphalt mixture. The mechanical properties of the asphalt binder, the matrix in the asphalt mixture composite, are time and temperature dependent and have a lower stiffness compared to the inclusions (aggregate particles). However, computational methods used to model the micromechanics of asphalt mixtures typically assume a constant bulk modulus or Poisson’s ratio for asphalt binders. This research investigates the time-dependence of the bulk modulus of asphalt binders. Several approaches for measuring the bulk modulus were explored and the poker-chip geometry was found to be the most suitable one. The boundary value problem for the poker-chip geometry was solved to determine the bulk modulus and Poisson’s ratio of asphalt binders as a function of time. The findings from this research improve our understanding of the viscoelastic behavior of asphaltic materials, and also guide important assumptions that are typically made during computational modeling of asphaltic materials.

Keywords

Asphalt binder Bulk modulus Poisson’s ratio Laboratory measurement Poker-chip geometry Dynamic Shear Rheometer (DSR) Viscoelastic Pavement 

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Arash Motamed
    • 1
  • Amit Bhasin
    • 1
  • Kenneth M. Liechti
    • 2
  1. 1.Dept. of Civil, Architectural and Environmental EngineeringUniversity of Texas at AustinAustinUSA
  2. 2.Dept. of Aerospace Engineering and Engineering MechanicsUniversity of Texas at AustinAustinUSA

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