A testing system has been developed to evaluate the resilient modulus of subgrade soils used as highway pavement structure materials for the Rhode Island Department of Transportation (RIDOT). The system consists of an H & V triaxial testing apparatus with a wooden environmental chamber connected to a freezer by means of metal tubes. Because it has been recognized that the current procedure of the American Association of State Highway and Transportation Officials (AASHTO) is too harsh to adequately determine the modulus of all types of soils, developments included establishing a modified procedure to simulate the field stress conditions for Rhode Island soils and areas of similar environment. A soil stress analysis was utilized to determine an appropriate loading sequence for the test. Two field sites were instrumented with soil moisture-temperature cells and other meteorological devices to duplicate the field conditions during laboratory testing. Resilient moduli were evaluated at the location of the Average Depth of Significant Stress (ADSS). Multiple regression equations and charts were developed to predict the resilient modulus under various environmental conditions based on results with two granular materials. A parametric study to identify the seasonal variation was performed. The results indicated that the resilient modulus decreases as the water content increases at a constant temperature. At the same water content, the resilient modulus increases as the temperature decreases. The effective resilient moduli were computed using the AASHTO procedure and field conditions. Volume II of the final report contains a manual for operating the developed resilient modulus testing system.

  • Corporate Authors:

    University of Rhode Island, Kingston

    Department of Civil Engineering
    Rhode Island Transportation Research Center
    Kingston, RI  United States  02881

    Rhode Island Department of Transportation

    State Office Building, 2 Capitol Hill
    Providence, RI  United States  02903

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Kovacs, W D
    • LEE, K W
    • Jin, M S
  • Publication Date: 1991-12

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 200 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00618759
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-RI-RD-91-01, URI-CVET-91-4/1
  • Contract Numbers: RI89106 HPR-121-1217
  • Created Date: Jan 31 1992 12:00AM