MEASUREMENT OF ROAD SURFACE MACROTEXTURE FOR SKID RESISTANCE PREDICTION. PRINCIPLES AND MEASURING METHODS

MAETNING AV VAEGBELAEGGNINGAR MAKROTEXTURE FOER FRIKTIONSBEDOEMNING. PRINCIPER OCH MAETMETODER

The report describes most of the currently known methods for measuring macrotexture of drainage capability. The method most commonly used is the sand patch test. Devices for direct detection of surface texture include various kinds of profilometers, but refined measuring methods do not automatically produce better results than simpler ones. Non-contact techniques offer new possibilities for measuring from moving vehicles. Among such devices, the TRRL electro-optical system is the most advanced one. Schonfeld's photographic method provides a total friction evaluation, since both macro- and microtexture are included. Analysis of photographs is however, always a tedious procedure. Measuring drainage capability by outflow meters is considered an attractive principle for estimating the wet friction-speed gradient, but seems to give no more reliable results than direct texture measurements. Of special interest is a French construction, which allows continuous outflow registration during movement. For practical purposes macrotexture measurements are used in testing and control of new pavement surfaces and at certain critical spots, such as accident sites. Pavement condition survey is another possible field of application. Macrotexture specifications have been laid down in Belgium and Great Britain, and simpler recommendations have been introduced in several other countries, e.g. Canada, Federal Republic of Germany, France, Netherlands, Switzerland and some states in USA. (TRRL)

• Corporate Authors:

  Swedish National Road and Transport Research Institute (VTI)

  Linköping,   Sweden  SE-581 95
• Authors:
  • Alm, L-O
• Publication Date: 1979

Language

• Swedish

Media Info

• Features: Figures; References;
• Pagination: 64 p.

Subject/Index Terms

• TRT Terms: Drainage; Forecasting; Macrotexture; Measurement; Measuring instruments; Methodology; Optics; Pavements; Photography; Profilometers; Size; Skid resistance tests; Specifications; Surface course (Pavements); Texture
• Uncontrolled Terms: Macro
• Old TRIS Terms: Photographic methods
• ITRD Terms: 2937: Drainage; 9041: Macro; 6136: Measurement; 9102: Method; 6764: Optics; 6751: Photography; 6103: Profilometer; 3061: Sand patch method; 177: Specifications; 3053: Surface texture
• Subject Areas: Highways; Hydraulics and Hydrology; Pavements; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00322126
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Report/Paper Numbers: VTI NR 163 Monograph
• Files: ITRD, TRIS
• Created Date: Apr 15 1981 12:00AM