LTPP Data Analysis: Significance of "As-Constructed" AC Air Voids to Pavement Performance

Many highway agencies use air voids or other volumetric properties (e.g., voids in mineral aggregate and asphalt content) as payment attributes in QC/QA specifications for hot mix asphalt (HMA). These agencies have developed statistical tolerances for air voids from historical data and set specification levels for air voids based on experience. However, quantifying relationships between air voids and HMA pavement performance has proven more difficult. The objectives of this project were to (1) evaluate the use of LTPP data for determining the effect of in-place air voids and other mix volumetric properties on the performance of HMA pavements, (2) develop new or modified air voids content guidelines for optimum pavement performance, and (3) examine the effect of the level of construction control in the LTPP GPS and SPS on the variability of as-constructed air voids and other volumetric properties. Accomplishment of these objectives was seriously hampered by a lack of suitable data in the LTPP database. NCHRP Research Results Digest 269, based on the agency's final report, summarizes key findings from the project.


  • English


  • Status: Completed
  • Funding: $100000
  • Contract Numbers:

    Project 20-50(14)

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Performing Organizations:

    Applied Pavement Technology, Inc

  • Principal Investigators:

    Seeds, Stephen

  • Start Date: 20000605
  • Expected Completion Date: 20020628
  • Actual Completion Date: 20020628

Subject/Index Terms

Filing Info

  • Accession Number: 01680050
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-50(14)
  • Files: TRB, RiP
  • Created Date: Sep 10 2018 3:03PM