Skip to main content

Relationship of Air Voids, Lift Thickness, and Permeability in Hot-Mix Asphalt Pavements (2004) / Chapter Skim
Currently Skimming:

Chapter 5 - Conclusions and Recommendations
Pages 35-36

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 35...
... For mix design samples and other laboratory samples that are compacted to relatively low voids, the displacement method will provide reasonably accurate answers. However, for field samples where the void levels will typically be 6 percent or higher, it is important to evaluate absorption to determine if the vacuum-seal method needs to be used.
Read the entire page →
From page 36...
... 36 Even though there is a lot of scatter within and between projects, most field results support the finding that higher t/NMAS ratios generally provide lower void levels. Coarsegraded mixtures generally have higher permeability values than the fine-graded mixtures for a given air void level.
Read the entire page →

Key Terms

  • air void
  • water absorption
  • water displacement
  • void levels
  • seal method

  • displacement method
  • void contents
  • compactive effort
  • percent air
  • mixes placed

  • void level
  • similar air
  • field projects
  • imum density
  • displacement test

  • design air
  • test track
  • sealing method
  • significant loss
  • lower void

  • average air
  • absorption level
  • mixtures regardless
  • methods resulted
  • bulk specific

  • mixes tested
  • lower density
  • design samples
  • dimensional method
  • cooled twice


    • This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
    More information on Chapter Skim is available.