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Volumetric Requirements for Superpave Mix Design (2006) / Chapter Skim
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Pages 1-4

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
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From page 1...
... for estimating mixture performance on the basis of volumetric composition. • Many state highway agencies have modified the requirements for VMA, air voids, and related factors for Superpave mixtures.
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From page 2...
... • Data analyzed during NCHRP Projects 9-25 and 9-31 showed that permeability of HMA increases with increasing air voids and decreasing aggregate specific surface. Permeability can be effectively modeled using the concept of effective air voids -- the total air void content minus the air void content at zero permeability.
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From page 3...
... 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%. Establishing maximum VMA values and eliminating VFA requirements make the Superpave system simpler and more direct and reduce the chances of designing HMA with poor rut resistance.
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From page 4...
... This illustrates the importance of field compaction on pavement performance and also emphasizes that care is needed when changing requirements in HMA in an attempt to address specific performance issues. Decreasing design air voids to from 4.0% to 3.0% while decreasing the target air voids in the field a similar amount will improve both fatigue resistance and rut resistance while decreasing permeability.
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Key Terms

  • rut resistance
  • design air
  • air void
  • fatigue resistance
  • age hardening

  • void content
  • nchrp projects
  • aggregate specific
  • field compaction
  • specific surface

  • minimum vma
  • constant vma
  • vma values
  • changing design
  • current superpave

  • asphalt paving
  • paving technologists
  • highway agencies
  • target air
  • increasing design

  • decreasing design
  • design compaction
  • increased rut
  • poor rut
  • increasing vma

  • void contents
  • asphalt binder
  • mixture age
  • increasing minimum
  • binder grade


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