The study deals with the development of a methodology for predicting the amount of useful life remaining in flexible pavements exposed to the effects of traffic, age and environment. Such a methodology is considered necessary if accurate predictive models are to be developed for use in future rehabilitation studies of the state highway network. Volume II considers the remaining life characteristics interpreted from theory and lab fatigue testing. Volume III presents the remaining life studies interpreted from various multilayer design theories and the AASHTO design procedure. Volume IV is a study comparing predicted deflections obtained from theory to deflections measured with the Road Rater device. The study was based upon a comprehensive analytical, laboratory and field investigation of three Maryland highway pavements (US1; Md 97; Md 695). The overall conclusion indicates that the best probable method for determining remaining life is by analytical techniques (multilayer designs and the AASHTO). While the use of field cores and direct fatigue testing to estimate remaining life has potential, more fundamental research must be accomplished. Theoretically predicted pavement deflections are greater than measured Road Rater deflections by a factor of 2 to 4. It was felt that the granular base moduli measured in the laboratory is not the true indicator of the in-situ material moduli. Field adjustment factors were developed to account for this difference.

  • Supplemental Notes:
    • See also Volume 1, PB-296563. Prepared for Maryland State Highway Administration, Brooklandville. Also available in set of 4 reports, PB-296561-SET.
  • Corporate Authors:

    University of Maryland, College Park

    Department of Civil and Environmental Engineering
    College Park, MD  United States  20742

    Maryland Department of Transportation

    State Highway Administration, 2323 West Joppa Road
    Brooklandville, MD  United States  21022

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Witczak, M W
  • Publication Date: 1978-10

Media Info

  • Pagination: 146 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00197621
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FHWA/MD/R-79/1 Final Rpt.
  • Created Date: Aug 28 1979 12:00AM