Density of Asphalt Concrete - How Much is Needed?

Details

• Creators:
  Brown, E.Ray
• Subject/TRT Terms:
  • Asphalt mixtures
  • Instruments for measuring density
  • Cores (Specimens)
  • Nuclear gages
  • asphalt
  • deformation
  • nuclear meters
  • physcial properties
• DOI:
  https://doi.org/10.21949/1404494
• Resource Type:
  Tech Report
• Geographical Coverage:
  Alabama;United States
• TRIS Online Accession Number:
  00750977
• Corporate Publisher:
  National Center for Asphalt Technology (U.S.)
• NTL Classification:
  NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ; NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
• Abstract:
  Density is one of the most important parameters in construction of asphalt ; mixtures. A mixture that is properly designed and compacted will contain enough ; air voids to prevent rutting due to plastic flow but low enough air voids to ; prevent permeability of air and water. Since density of an asphalt mixture ; varies throughout its life the voids must be low enough initially to prevent ; permeability of air and water and high enough after a few years of traffic to ; prevent plastic flow. ; There are three primary methods of specifying density: percent of control strip, ; percent of laboratory density, and percent of theoretical maximum density. All ; three methods can be used to obtain satisfactory compaction if used correctly. ; The initial in-place air voids must be below approximately eight percent and the ; final in-place air voids must be above approximately three percent. The initial ; in-place air voids are determined by comparing bulk density to theoretical ; maximum density (TMD) and the final in-place air voids are estimated by ; comparing bulk density of laboratory compacted sampler to the TMD. ; The two methods that have been used to measure bulk density of asphalt mixture ; are physical measurements of cores and nuclear gage. The nuclear gage is fast ; and non-destructive but is not as accurate as the core method.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/13189/dot_13189_DS1.pdf
• File Type:
  [PDF - 165.94 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:9db7b94057582605e40f98cc191639a9e5a5e422ebb4b10fe6732bd8bbc95a52