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ASTM E1960-03e1

Historical Revision

Standard Practice for Calculating International Friction Index of a Pavement Surface

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1.1 This practice covers the calculation of the International Friction Index (IFI) from a measurement of pavement macrotexture and wet pavement friction. The IFI was developed in the PIARC International Experiment to Compare and Harmonize Texture and Skid Resistance Measurements. The index allows for the harmonizing of friction measurements with different equipment to a common calibrated index. This practice provides for harmonization of friction reporting for devices that use a smooth tread test tire.

1.2 The IFI consists of two parameters that report the calibrated wet friction at 60 km/h (F60) and the speed constant of wet pavement friction (Sp).

1.3 The mean profile depth (MPD) and mean texture depth (MTD) have been shown to be useful in predicting the speed constant (gradient) of wet pavement friction.

1.4 A linear transformation of the estimated friction at 60 km/h provides the calibrated F60 value. The estimated friction at 60 km/h is obtained by using the speed constant to calculate the estimated friction at 60 km/h from a measurement made at any speed.

1.5 The values stated in SI (metric) units are to be regarded as standard. The inch-pound equivalents are rationalized, rather than exact mathematical conversions.

1.6 This standard does not purport to address all of the safety concerns, if any associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


SDO ASTM: ASTM International
Document Number E1960
Publication Date Aug. 10, 2003
Language en - English
Page Count 5
Revision Level 03e1
Supercedes
Committee E17.21
Publish Date Document Id Type View
April 1, 2007 E1960-07 Revision
Aug. 10, 2003 E1960-03E01 Revision
Aug. 10, 2003 E1960-03 Revision
July 10, 1998 E1960-98 Revision
May 1, 2023 E1960-07R23 Reaffirmation
Sept. 1, 2015 E1960-07R15 Reaffirmation
Sept. 1, 2011 E1960-07R11 Reaffirmation