DETERMINATION OF REMAINING FLEXIBLE PAVEMENT LIFE. VOLUME I. EXECUTIVE SUMMARY
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.
- See also Volume 1, PB-296563. Prepared for Maryland State Highway Administration, Brooklandville. Also available in set of 4 reports, PB-296561-SET.
University of Maryland, College ParkDepartment of Civil and Environmental Engineering
College Park, MD USA 20742
Brooklandville, MD USA 21022
Washington, DC USA 20590
- Witczak, M W
- Publication Date: 1978-10
- Pagination: 146 p.
- TRT Terms: Deflection; Deterioration; Dynamic modulus of elasticity; Dynamic tests; Failure; Fatigue (Mechanics); Fatigue tests; Flexible pavements; Forecasting; Laboratory tests; Maintenance; Pavements; Performance tests; Service life; Theory
- Geographic Terms: Maryland
- Old TRIS Terms: Pavement deflection; Pavement life
- Subject Areas: Design; Highways; Maintenance and Preservation; Pavements;
- Accession Number: 00197621
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: FHWA/MD/R-79/1 Final Rpt.
- Files: NTIS, TRIS, USDOT, STATEDOT
- Created Date: Aug 28 1979 12:00AM