A STATEWIDE STUDY OF SUBGRADE SOIL SUPPORT CONDITIONS

This study was conducted to obtain data on state subgrade support conditions, develop correlations between soil properties, design and rutting parameters and to develop a rutting model for Ohio soils. Nine representative soils selected from a soils survey were evaluated for material characteristics. Laboratory samples of each soil, compacted at various moisture contents and dry densities, were subjected to dynamic uniaxial loading with various dynamic stresses, wetting-drying to assess moisture effects on dynamic modulus and rutting parameters. Undisturbed samples from one project site were subjected to the same test program for comparison. Results indicate: (1) soils' resilient moduli exhibited dependency on moisture and density of in-situ soils; (2) subgrade saturation decreased resilient moduli by a factor of four, being more significant for soils compacted on dry side of optimum; at moisture contents 4% above optimum, moduli approached a minimum level independent of soil type; (3) the resilient modulus-moisture/density relation is highly dependent on soil type, exhibiting an optimum depending on soil type; (4) some soils' resilient moduli were dependent on stress level, with deviatoric stress effects varying by soil type; the effect of stresses of 8-10 psi on resilient moduli was insignificant.

• Corporate Authors:

  Ohio State University, Columbus

  Department of Civil Engineering
  Hitchcock Hall 470
  Columbus, OH  United States  43210

  Ohio Department of Transportation

  P.O. Box 889
  Columbus, OH  United States  43215
• Authors:
  • Majidzadeh, K
  • Khedr, S
  • Bayomy, F
• Publication Date: 1978-10

Media Info

• Pagination: 217 p.

Subject/Index Terms

• TRT Terms: Bearing capacity; Dry density; Dynamic loads; Geological surveying; Load tests; Mathematical models; Mechanical tests; Modulus of resilience; Moisture content; Properties of materials; Ruts (Pavements); Saturated soils; Soils; Subgrade (Pavements)
• Uncontrolled Terms: Rut; Soil properties
• Old TRIS Terms: Dry density (Soils); Soil support value; Uniaxial testing
• Subject Areas: Design; Geotechnology; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I33: Other Materials used in Pavement Layers;

Filing Info

• Accession Number: 00316686
• Record Type: Publication
• Report/Paper Numbers: FHWA-OH-79-002
• Contract Numbers: State Job 142 94(0)
• Files: TRIS, STATEDOT
• Created Date: Apr 15 1981 12:00AM