BENKELMAN BEAM VERSUS DYNAFLECT DEFLECTION CORRELATION FOR FLEXIBLE PAVEMENTS IN FLORIDA

The Florida Department of Transportation (FDOT) has been collecting deflection data with a Lane-Wells Dynaflect since 1966. Its use has been primarily confined to research rather than routine-type testing. The primary method used by the FDOT for measuring in-situ structural capacity of existing pavements has been the Benkelman Beam. This report evaluates the suitabilty of the Dynaflect to replace Benkelman Beam testing. Dynaflect dynamic deflection parameters are compared with Benkelman Beam static deflections. These Dynaflect parameters are: (1) Dynaflect Maximum Deflection (DMD); (2) Surface Curvature Index (SCI); (3) Base Curvature Index (BCI); (4) Spreadability (SPR); and (5) Deflection Basin Area (DBA). Equipment repeatability is also evaluated. Although the ultimate goal is the application of Dynaflect measurements for pavement designs, procedures for this use are not discussed in this report. (FHWA)

• Corporate Authors:

  Florida Department of Transportation

  Office of Materials and Research, P.O. Box 1029
  Gainesville, FL  United States  32602

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • McNamara, R L
  • Page, G C
• Publication Date: 1981-2

Media Info

• Pagination: 46 p.

Subject/Index Terms

• TRT Terms: Accuracy; Alternatives analysis; Benkelman beam; Correlation analysis; Deflection; Dynaflect; Flexible pavements; Pavements
• Old TRIS Terms: Dynaflect equipment; Pavement deflection
• Subject Areas: Data and Information Technology; Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00341185
• Record Type: Publication
• Report/Paper Numbers: FHWA-RD-81-S01115 Final Rpt., FL/DOT/OMR-81/237, FCP 45D1-292
• Contract Numbers: Study P-10-78
• Files: TRIS, USDOT, STATEDOT
• Created Date: Dec 22 1981 12:00AM