DETERMINATION OF THE INTERNATIONAL FRICTION INDEX (IFI)USING THE CIRCULAR TEXTURE METER (CTM) AND THE DYNAMIC FRICTION TESTER (DFT)

The Circular Texture Meter (CTM) has been developed as a device to measure macrotexture of pavements. The CTM has a CCD laser displacement sensor mounted on an arm that rotates on a circumference of 142 mm radius and measures the texture with a sampling interval of approximately 0.9 mm. The profile is measured on the same circumference that the coefficient of friction is measured with a Dynamic Friction Tester (DFT). In this study, the macrotexture of 21 asphalt concrete pavements and 14 portland cement concrete pavements were measured by the CTM and the results have been compared with those of the Sand Patch Test and the Sand Track Test. It was found that there is a good correlation between the Mean Profile Depth (MPD) as measured by the CTM and the Mean Texture Depth (MTD) by the Volumetric Method (Sand Patch Test). The study also shows that the International Friction Index (IFI) can be calculated from the MPD determined by the CTM and the coefficient of friction at a slip speed of 20 km/h measured by the DFT.

Language

  • English

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 109-121

Subject/Index Terms

Filing Info

  • Accession Number: 00801065
  • Record Type: Publication
  • ISBN: 2840601311
  • Files: TRIS
  • Created Date: Oct 23 2000 12:00AM