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Volumetric Requirements for Superpave Mix Design (2006) / Chapter Skim
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Pages 42-43

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From page 42...
... The potentially low fines content, when combined with high VMA values, can also lead to poor rut resistance, although this problem is relatively uncommon in HMA designed using the Superpave system. Many highway agencies have already modified volumetric requirements in the Superpave system, the most common changes being establishing maximum VMA values 1.5% to 2.0% above the minimum values, increasing minimum VMA by 0.5% to 1.0%, and/or a broadening of design air void content from 4.0% to a range of 3.0% to 5.0%.
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From page 43...
... Other approaches are possible to improving the fatigue resistance of HMA while maintaining or improving rut resistance and decreasing permeability. Agencies contemplating modification in Superpave specifications should first evaluate the level of in-place air voids being achieved during flexible pavement construction and verify that acceptable levels of field compaction are being achieved -- poor field compaction will have a significant negative impact on pavement performance that can only be partially offset by proper mix design.
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Key Terms

  • rut resistance
  • design air
  • fatigue resistance
  • field compaction
  • air void

  • binder content
  • binder contents
  • aggregate specific
  • decreasing permeability
  • specific surface

  • changing design
  • held constant
  • vma values
  • poor rut
  • increasing levels

  • compaction level
  • placed prior
  • current hma
  • field data
  • minimum values

  • minimum binder
  • instituting multiple
  • void contents
  • current superpave
  • useful tools

  • decreasing design
  • contemplating modification
  • vfa requirements
  • asphalt binder
  • increasing air


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