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Investigation of Short-Term Laboratory Aging of Neat and Modified Asphalt Binders (2011) / Chapter Skim
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Pages 60-63

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From page 60...
... Unexpectedly, the stiffer polymer-modified binders aged more relative to the PAV than did the neat asphalt binders. 4.1.2 VCS Study The SAFT included a volatile collection system (VCS)
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From page 61...
... • Oven-aged mixtures experiment where rheological properties of short-term aged binders were compared to properties back-calculated from oven-aged mixtures. 4.1.4.1 RTFOT Verification Experiment The RTFOT verification experiment included comparisons of high-temperature, continuous-grade ChristensenAnderson master curve parameters and aging indices for SAFT and MGRF residue to those for RTFOT residue.
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From page 62...
... Hardening measured by the change in the Christensen-Anderson crossover frequency was greater for AASHTO R30 compared to the RTFOT, SAFT, and MGRF. Binder aging indices also were greater for AASHTO R30 compared to the three short-term binder aging procedures.
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From page 63...
... The research completed in NCHRP Project 9-36 showed a difference between the short-term binder and mixture aging procedures, with the mixture procedure providing somewhat greater amounts of aging. It should be possible to calibrate the binder and mixture procedures to provide similar levels of aging.
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Key Terms

  • dynamic modulus
  • aging indices
  • mass change
  • volatile compounds
  • curve parameters

  • master curve
  • modulus test
  • crossover frequency
  • aging test
  • molecular sieve

  • rtfot mass
  • aged binder
  • binder aging
  • prototype vcs
  • operating parameters

  • laboratory aging
  • asphalt binders
  • commercial saft
  • aging procedures
  • modified binders

  • aging time
  • verification experiment
  • impeller speed
  • rtfot verification
  • improved vcs

  • aging procedure
  • aging temperature
  • mgrf aging
  • mixture aging
  • air bubbles


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