This research investigation, conducted by the Physical Research Unit of the Minnesota Department of Transportation, began in 1971 to learn more about the behavior of Full-Depth asphalt pavements. The investigation has 26 test sections, each 1200 feet (365.8m) long, of a variety of thicknesses, on a variety of soils. The thicknesses range from approximately 5 inches (12.7 cm) to 17 1/2 inches (44.5 cm) and soil types include AASHO soil classification A-2-4's, A-3's, A-4's, A06's and A-7-6's. These soils include a stabilometer R-value range of 5 to 75. The major portions of the research work on this investigation consisted of Benkelman beam measurements on the test sections at 50 foot (15.2 m) intervals, taken weekly throughout the spring, bi-weekly throughout the summer and monthly into the fall. The temperature of the upper 1 1/2 inches (3.8 cm) of the mat was measured each time the Benkelman beam deflections were taken. These data were then used to determine the effect the temperature and the season had on deflections and also created a set of correction factors to apply to the measured deflections to adjust the deflections to an 80 deg C) peak season deflection. The peak season 80 deg F (26.7 deg C) mat temperature deflection was then taken to be the standard deflection for each of the test sections. These standard deflections were then compared to the deflections of aggregate base pavements and a relation ship was developed between the Full-Depth thickness and the granular equivalency of an equivalent deflection aggregate base pavement. That relationship was then used to develop a Full-Depth bituminous pavement design chart which is the deflection equivalent of the flexible pavement design chart currently in use by Mn/DOT. /FHWA/

  • Corporate Authors:

    Minnesota Department of Transportation

    Transportation Building, 395 John Ireland Boulevard
    St Paul, MN  United States  55155
  • Authors:
    • Lukanen, E O
  • Publication Date: 1977

Media Info

  • Pagination: 81 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00189484
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-MN-78-4 Intrm Rpt.
  • Created Date: Apr 12 1979 12:00AM