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BENKELMAN BEAM VERSUS DYNAFLECT DEFLECTION CORRELATION FOR FLEXIBLE PAVEMENTS IN FLORIDA

R L McNamara, Gale C. Page

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Abstract

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)

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What this paper is about

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)

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Available abstract

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)

Key concepts: Deflection (physics), Curvature, Structural engineering, Engineering, Geotechnical engineering, Repeatability, Beam (structure), Geology

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