01125414

Component

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 different readings 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 DFT readings and IFI computations was developed. In addition other variables that also affect the friction measurements obtained using the DFT are identified.

01120148

09-0100

English

14p

2009

Transportation Research Board 88th Annual Meeting

DVD

Figures (10) ; References (11) ; Tables (3)

Calibration; Friction tests; Measuring instruments; Pavement management systems; Pavement performance; Texture

International Friction Index

Dynamic friction tester

Highways; Pavements; I22: Design of Pavements, Railways and Guideways

Transportation Research Board Annual Meeting 2009 Paper #09-0100

TRIS, TRB

Jan 30 2009 4:21PM