Factors Influencing Frictional Measurement Using Dynamic Friction Tester.

Author(s)
Fuentes, L.G. & Gunaratne, M.
Year
Abstract

A study was performed to evaluate the different factors that influence frictional measurements obtained using the Dynamic Friction Tester (DFT). The International Friction Index (IFI) is an index used to compare and harmonize friction measurements obtained from different friction measuring devices. ASTM E 1960 advocates the use of the DFT for calibration of friction measuring devices in IFI computations. Researchers have observed differentreadings at different times of the year when performing friction measurements on the same pavement surface. These variations are commonly referred as seasonal variations. In this study it was identified that higher testing temperatures produce lower friction values on the same pavement surface.Hence, temperature effects seem to be the dominating parameter causing seasonal variations of friction. Based on the result of this study, a temperature calibration factor that would account for temperature effects on DFTreadings and IFI computations was developed. In addition other variables that also affect the friction measurements obtained using the DFT are identified.

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Publication

Library number
C 45028 (In: C 45019 DVD)
Source

In: Compendium of papers DVD 88th Annual Meeting of the Transportation Research Board TRB, Washington, D.C., January 11-15, 2009, 14 p.

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