Assessment of Pavement Structural Strength by the Falling Weight Deflectometer

This study seeks to derive an equation for calculating the pavement equivalent E-modulus on the basis of falling weight deflectometer (FWD) deflection measurement data. This equation will be used in the Estonian Pavement Management System (EPMS) for network and project level analysis so that the determined values are comparable with the Estonian flexible pavement design procedure 2001-52. In 1999 32 and in 2001 an additional 19 FWD test sites were chosen on actual pavement structures for the performance of annual FWD measurements, once or twice per month from early spring until late autumn. FWD measurement data were analyzed mathematically and the results were compared with the Estonian flexible pavement design procedure. The quantitative methodology for evaluating the qualitative characteristics of the pavement is determined on the basis of the Cobb-Douglas equation, taking into account at a time a nearly unlimited number of factors influencing the pavement structural condition. The relationship between the pavement equivalent E-modulus calculated according to the procedure 2001-52 and based on the FWD measured deflection is determined. The equation for calculating of the pavement equivalent E-modulus on the basis of the FWD deflection data to be used in the EPMS is derived. The correction factors for the pavement equivalent E-modulus, taking into account the month of the FWD measurement performance, moisture conditions and road embankment height at the FWD test site, are mathematically based on Estonian statistical data.

  • Availability:
  • Authors:
    • Aavik, Andrus
    • Paabo, Priit
    • Kaal, Tiit
  • Publication Date: 2006


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01044753
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 19 2007 10:28PM