A METHOD FOR EVALUATING THE STRUCTURAL PERFORMANCE OF SUBGRADES AND/OR THE OVERLYING FLEXIBLE PAVEMENTS

THE STRUCTURAL EVALUATION OF FLEXIBLE PAVEMENT IS NOW CARRIED ON MOSTLY BY DEFLECTION MEASURING DEVICES SUCH AS THE DYNAFLECT OR BENKELMAN BEAM. THE OBJECT WAS TO DETERMINE WHETHER THE PROPERTIES OF THE DEFLECTED BASIN MEASURED BY THESE DEVICES ON THE PAVEMENT SURFACES COULD ENABLE EVALUATION OF THE SUBGRADE AND ITS OVERLYING PAVEMENT SEPARATELY. THE PROPERTIES OF THE DEFLECTED BASIN MEASURED BY THESE DEVICES ON THE PAVEMENT SURFACES COULD ENABLE EVALUATION OF THE SUBGRADE AND ITS OVERLYING PAVEMENT SEPARATELY. THE PROPERTIES OF THE DEFLECTED BASIN ARE DEFINED BY THE MAXIMUM DEFLECTION AND THE SPREADABILITY, WHICH IS THE AVERAGE DEFLECTION PERCENT OF THE MAXIMUM DEFLECTION. A THEORETICAL ANALYSIS SHOWED THAT THESE PROPERTIES ARE A FUNCTION OF THE MODULUS OF ELASTICITY OF THE SUBGRADE, THE AVERAGE MODULUS OF EALSTICITY OF THE PAVEMENT OVER THE SUBGRADE, AND THE THICKNESS INDEX OF THE PAVEMENT. A GENERAL CHART WAS DEVELOPED WHICH CORRELATES MAXIMUM DEFLECTION AND SPREADABILITY WITH (1) THE SUBGRADE STRENGTH, (2) THE AVERAGE PAVEMENT STRENGTH, AND (3) THE THICKNESS INDEX OF THE PAVEMENT. THE CHART WAS TESTED FOR STRUCTURAL EVALUATIONS OF THE SUBGRADE AND/ OR OVERLYING PAVEMENT FOR STRUCTURAL EVALUATIONS OF THE SUBGRADE AND/OR OVERLYING PAVEMENT FOR SATELLITE PROJECTS IN VIRGINIA. TEN TYPICAL EXAMPLES OF THE SATELLITE PROJECTS ARE GIVEN. /AUTHOR/

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• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/19870
• Corporate Authors:

  Virginia Department of Highways

  Richmond, VA  United States  23219

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Vaswani, N K
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Benkelman beam; Deflection; Flexible pavements; Modulus of elasticity; Pavements; Structural analysis; Subgrade (Pavements); Theory; Thickness
• Uncontrolled Terms: Pavement thickness
• Subject Areas: Geotechnology; Highways; Pavements;

Filing Info

• Accession Number: 00206455
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: Study No 0656
• Files: NTL, TRIS, USDOT, STATEDOT
• Created Date: Jan 31 1972 12:00AM