A method is proposed for the backcalculation of material properties in flexible pavements based on the interpretation of surface deflection measurements. ILLI-PAVE, a stress-dependent finite element pavement model, was used to generate data for developing algorithms and nomographs for deflection basin interpretation. Twenty four different flexible pavement sections throughout the State of Illinois were studied. Deflections were measured using the Benkelman Beam, the IDOT Road Rater, the Falling Weight Deflectometer, and an accelerometer to measure deflections under moving trucks. Loading mode effects on pavement response were investigated. The factors controlling the pavement response to different loading modes are identified and explained. Correlations between different devices are developed. Good agreement is achieved between backcalculated material properties and laboratory determined properties. Agreement is also obtained between measured and predicted deflection basins. The backcalculated parameters derived from the proposed evaluation procedure can be used as inputs for asphalt concrete overlay design. (FHWA)

  • Record URL:
  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Department of Civil and Environmental Engineering
    205 North Mathews Avenue
    Urbana, IL  United States  61801-2352

    Illinois Department of Transportation

    Bureau of Materials and Physical Research
    126 East Ash Street
    Springfield, IL  United States  62704-4766

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Hoffman, M S
    • Thompson, M R
  • Publication Date: 1981-6

Media Info

  • Pagination: 260 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00342054
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/IL/UI-190 Intrm Rpt., UILU-ENG-81-2010, FCP 45D2-362
  • Contract Numbers: IRH-508
  • Created Date: Jan 29 1982 12:00AM