MECHANISTIC PERMANENT DEFORMATION MODEL FOR UNBOUNDED PAVEMENT MATERIALS. FINAL REPORT

The principal objective of any pavement design procedure is to provide a structural system which will be suitable in a specific regional area and be able to sustain the anticipated traffic loading and frequency. The accomplishment of this objective and the utilization of the design procedure, however, is highly dependent on its ability to predict future performance of in-service pavements. A performance prediction at high confidence level, however, using the present state-of-the-art of material characterizations, is questionable. These material characterizations include, among other parameters, the permanent deformation potential of each pavement layer. In this study, the permanent deformation characteristics of five different base, subbase and subgrade materials were evaluated. The results of the investigation led to the development of a normalized predictive model of the plastic deformation. The model was found to be unique for each class of soil and independent of compaction, density, water content and stress-level. A significant finding of this study is that the permanent strain of any class material subjected to cyclic loadings could be predicted with high confidence level using the normalized predictive model. The input parameters of this model consist of the static strength and the corresponding strain of the material in question.

• Corporate Authors:

  Michigan State University, East Lansing

  Department of Civil Engineering
  East Lansing, MI  United States  48824-1226

  Federal Highway Administration

  Engineering Research and Development Bureau, 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Baladi, G Y
• Publication Date: 1982-2

Media Info

• Pagination: 112 p.

Subject/Index Terms

• TRT Terms: Base course (Pavements); Forecasting; Mathematical models; Pavement layers; Plastic deformation; Repeated loads; Strain (Mechanics); Strength of materials; Subbase materials; Subgrade (Pavements)
• Old TRIS Terms: Strains; Unbound pavement courses
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00461680
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: FHWA/RD-82/029, FCP 35E4-062
• Contract Numbers: 80-P-30112
• Files: TRIS, USDOT
• Created Date: Jan 31 1988 12:00AM