EVALUATION OF A DYNAMIC LOAD INDUCING DEVICE

This study has been concerned with the evaluation of dynamic load inducing device. A Road Rater instrument used for the pavement condition evaluation in Maryland was studied in this project. The dynamic deflection measurements of numerous pavement sites were evaluated and their performance were correlated with the field observations. Mathematical concepts and computer programs required for the pavement deflection analysis were also developed. The study arrived at several conclusions: (1) The Road Rater instrument when used with an acceptable range of frequency, and amplitude could be a useful tool for assessment of pavement conditions. The accuracy of measurements is greatly dependent on the displacement waveform and its stability at various frequencies. A deviation from sine waveform could significantly affect the magnitude of induced loads. (2) The deflection parameters, maximum deflection, SCI and BCI are accurate indicators of pavement performance. (3) The deflection of pavements exhibiting satisfactory performance, show a response linearily to the load magnitude. The load-deflection response, however, becomes non-linear, for pavements exhibiting structural distress and poor performance. (4) The interrelation between maximum deflection and SCI can be used to identify pavements exhibiting various levels of structural performance. (5) Pavement modulus-temperature interrelation has been developed using results of field measurements. A temperature correction factor has been formulated to adjust the pavement deflection measurements to a reference temperature of 70 deg. F. (6) Computer programs, graphical technical and analysis procedures have been developed. /FHWA/

  • Supplemental Notes:
    • Sponsored by the Maryland State Highway Administration. Prepared in cooperation with the Department of Transportation, Federal Highway Administration.
  • Corporate Authors:

    Maryland Department of Transportation

    State Highway Administration, 2323 West Joppa Road
    Brooklandville, MD  USA  21022
  • Authors:
    • Majidzadeh, K
  • Publication Date: 1977-1

Media Info

  • Pagination: 141 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188509
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-MD-R-78-6 Final Rpt., FCP 45D2-234
  • Contract Numbers: AW077-137-046
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Mar 14 1979 12:00AM