MECHANISTIC INTERPRETATION OF NONDESTRUCTIVE PAVEMENT TESTING DEFLECTIONS

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:
  http://www.ict.uiuc.edu/Publications/report%20files/TES-032.pdf
• 
• 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

• TRT Terms: Accelerometers; Algorithms; Asphalt concrete; Benkelman beam; Correlation analysis; Deflection; Deflectometers; Finite element method; Flexible pavements; Nomographs; Nondestructive tests; Overlays (Pavements); Pavements
• Old TRIS Terms: Finite elements; Pavement deflection
• Subject Areas: Data and Information Technology; Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

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
• Files: TRIS, USDOT, STATEDOT
• Created Date: Jan 29 1982 12:00AM