COMPUTER AIDED OVERLAY DESIGN SYSTEM FOR FLEXIBLE PAVEMENTS

This study presents a mechanistic-based overlay design system and its implementation in a computer program named "FLEXOLAY" for the state of Idaho. The concept adopted is based on analyzing the pavement distresses in terms of rutting and fatigue and determining an overlay thickness using strain-based fatigue and rutting models. The developed design procedures consider the past and the expected future traffic to calculate the required overlay thickness. Evaluation of existing pavements is performed by nondestructive testing using Falling Weight Deflectometer. Effect of seasonal variation is considered by employing seasonal adjustment factors for pavement layers moduli to account for each season. Seasonal factors for different climate regions in Idaho have been established and used in the environmental data base of the computer program. The program allows for entering other seasonal factors for other locations. The user has the flexibility to enter different shift factors based on local experience.

• Supplemental Notes:
  • This conference was arranged by the International Society for Asphalt Pavements. The ninth conference will be held in Copenhagen, Denmark in August 2002.
• Corporate Authors:

  University of Washington, Seattle

  Department of Civil and Environmental Engineering, P.O. Box 352700
  Seattle, WA  United States  98195-2700
• Authors:
  • Bayomy, F M
  • Al-Kandari, F
  • Nassar, Walid M
• Conference:
  • Eighth International Conference on Asphalt Pavements
  • Location: Seattle, Washington
  • Date: 1997-8-10 to 1997-8-14
• Publication Date: 1997

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 79-92

Subject/Index Terms

• TRT Terms: Computer aided design; Computer programs; Falling weight deflectometers; Fatigue (Mechanics); Flexible pavements; Mechanistic design; Nondestructive tests; Overlays (Pavements); Rutting; Thickness
• Uncontrolled Terms: Seasonal variations
• Geographic Terms: Idaho
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00764651
• Record Type: Publication
• Report/Paper Numbers: Volume I
• Files: TRIS, ATRI
• Created Date: Jun 8 1999 12:00AM