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Mixing and Compaction Temperatures of Asphalt Binders in Hot-Mix Asphalt (2010) / Chapter Skim
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Summary
Pages 1-4

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From page 1...
... However, this method often yields excessively high temperatures for many modified binders that have caused concerns with degradation of the binder's properties and emission problems in laboratories during preparation of samples and during production and placement of asphalt mixtures in the field. In the absence of a reliable method for selecting mixing and compaction temperatures for modified asphalt binders, many agencies have written their specifications to simply allow the binder supplier to set an appropriate mixing temperature for each modified binder.
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From page 2...
... The Steady Shear Flow method yielded mixing and compaction temperatures lower than those from the traditional equiviscous method for modified and unmodified binders. Temperature differences between the two methods were greater for modified binders, which confirmed shear thinning behavior for the modified binders.
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From page 3...
... The stiffening effect was more evident for binders with lower PG grades. Conclusions Both the Steady Shear Flow method and the Phase Angle method provide lower mixing and compaction temperatures for modified asphalt binders compared with the traditional equiviscous method.
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From page 4...
... Greater latitude in mixing temperatures is necessary in the field to allow for different ambient conditions, haul distances, and other mix characteristics that affect coating and compactability. Four additional steps are recommended to validate, refine, and assist the implementation of the Steady Shear Flow and/or Phase Angle methods: 1.
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Key Terms

  • steady shear
  • phase angle
  • shear flow
  • flow method
  • asphalt binders

  • angle method
  • mixing temperatures
  • modified asphalt
  • modified binders
  • equiviscous method

  • shear rate
  • asphalt binder
  • unmodified binders
  • lower mixing
  • candidate methods

  • candidate method
  • traditional equiviscous
  • binder properties
  • parallel plate
  • shear thinning

  • unmodified asphalt
  • angle methods
  • viscosity method
  • appropriate mixing
  • selecting mixing

  • provide reasonable
  • rate viscosity
  • coating test
  • mixture coating
  • plate geometries


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