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ESEM Microstructural and Physical Properties of Virgin and Laboratory Aged Bitumen

  • Peter MikhailenkoEmail author
  • Hassan Baaj
  • Changjiang Kou
  • Lily D. Poulikakos
  • Augusto Cannone Falchetto
  • Jeroen Besamusca
  • Bernhard Hofko
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 20)

Abstract

The physical and microstructural properties of four straight run asphalt binders were examined and compared in virgin state and in after short term aging (RTFOT) and long-term (PAV) laboratory aging. RTFOT aging was conducted at 123, 143 and 163 °C. Physical testing parameters included penetration and softening point. Selected binders came from four different sources with same penetration grade. They all showed an increase in stiffness with aging, and RTFOT temperatures. The microstructural evolution of the binder was examined by Environmental Scanning Electron Microscopy (ESEM) on aged binders at 123 and 163 °C. The physical transformation corresponded to an evolution in the binders’ ‘fibril’ microstructure under ESEM as a result of electron beam exposure, with the microstructure getting denser with PAV aging. The asphalt binders showed varied ESEM ‘fingerprints’ and aged in different ways. The ESEM properties generally showed to evolve with the physical properties, although this was not the case for all of the binders due to their unique aging characteristics.

Keywords

Asphalt binder Aging Environmental Scanning Electron Microscopy (ESEM) Microstructure Penetration Softening point 

References

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Copyright information

© RILEM 2019

Authors and Affiliations

  • Peter Mikhailenko
    • 1
    Email author
  • Hassan Baaj
    • 1
  • Changjiang Kou
    • 1
    • 2
  • Lily D. Poulikakos
    • 3
  • Augusto Cannone Falchetto
    • 4
  • Jeroen Besamusca
    • 5
  • Bernhard Hofko
    • 6
  1. 1.University of WaterlooWaterlooCanada
  2. 2.Yangzhou UniversityYangzhouChina
  3. 3.EMPADübendorfSwitzerland
  4. 4.Technische Universität BraunschweigBraunschweigGermany
  5. 5.Kuwait Petroleum Research and TechnologyRotterdamNetherlands
  6. 6.Technical University of ViennaViennaAustria

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