This report describes a study to evaluate the use of subgrade resilient modulus for the design of flexible pavements. The objectives of this initial study were to: a) investigate the relationship between resilient modulus and R-value, and b) develop a predictive equation for resilient modulus based on easily measured soil properties. Thirteen different fine-grained soils were investigated. Based on the test results, two multiple linear regression models for predicting resilient modulus are proposed. The principal result of this research is the development of improved equations for predicting the resilient modulus of silty and clayey subgrade soils in Wyoming. These equations yield the resilient modulus as a function of soil type, the state of stress in the pavement subgrade, the degree of soil saturation, R-value, and other soil properties. This study is the first to provide highway engineers in Wyoming with reliable information on the resilient modulus of representative subgrade soils. The information contained herein can be used by highway engineers to make informed decisions on how to incorporate the recommendations of the 1986 AASHTO Guide for Design of Pavement Structures into design methodology for highway pavements.

  • Record URL:
  • Supplemental Notes:
    • This study was conducted at the Department of Civil and Architectural Engineering, University of Wyoming, P.O. Box 3295, Laramie, Wyoming 82071-3295, and funded by the U.S. Department of Transportation's University Transportation Centers Program.
  • Corporate Authors:

    Mountain-Plains Consortium

    North Dakota State University
    Fargo, ND  United States  58108
  • Authors:
    • Farrar, M J
    • Turner, J P
  • Publication Date: 1991-1


  • English

Media Info

  • Media Type: Digital/other
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 100 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00639870
  • Record Type: Publication
  • Report/Paper Numbers: MPC Report No. 91-1
  • Files: TRIS
  • Created Date: Nov 29 2002 12:00AM