MATERIALS CHARACTERIZATIONS FOR DEVELOPMENT OF AN OVERLAY DESIGN PROCEDURE. FINAL REPORT

In 1984 a 400B Road-Rater was purchased by the Maine Department of Transportation. One of the primary intentions for the use of this piece of equipment was to assist in the aid of designing structural overlays. As a result a project was established for the purpose of calibrating or correlating deflection data to the structural strength of roadways. The model used in this study is based upon the Chevron Elastic Theory and is heavily influenced by the Kentucky model. The local information was obtained from carefully selected projects representing 5 different specific types of subgrade. When the deflections were taken, temperature and time were also recorded. Immediately after this test was performed pavement samples were cut and saved for further testing. Field CBR values were then taken on top of the gravel and again on top of the subgrade. Water contents and granular samples of the material were also taken. After the basic model was established, it was refined so that features such as temperature could be added to correct the pavement modulus. Eventually the model was expanded to the extent that the AASHTO Structural Design Equation was included. To verify the model, several recently constructed projects were tested and the deflections data backcalculated to determine the effective pavement thickness.

• Corporate Authors:

  Maine Department of Transportation

  Technical Services Division, 16 State House Station
  Augusta, ME  United States  04333

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Rand, D W
  • Casey, J
• Publication Date: 1989-11

Media Info

• Features: Figures; References;
• Pagination: 21 p.

Subject/Index Terms

• TRT Terms: Backcalculation; California bearing ratio; Deflection; Design methods; Elasticity (Mechanics); Mathematical models; Modulus of resilience; Moisture content; Overlays (Pavements); Pavements; Strength of materials; Structural design; Subgrade (Pavements); Temperature; Thickness
• Uncontrolled Terms: Pavement thickness
• Old TRIS Terms: Elastic theory; Pavement deflection
• Subject Areas: Data and Information Technology; Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00496603
• Record Type: Publication
• Report/Paper Numbers: FHWA-ME-89-2
• Files: TRIS, USDOT, STATEDOT
• Created Date: Aug 31 1990 12:00AM