In 1976 a test field was built in Linkoping for studies of interaction between local climate and road construction leading to skidding and differences in skid inclination between road constructions. Test sections represent conventional, un-insulated overpasses or insulated with cellular plastic. The field is amply instrumented to register air temperature, relative humidity, net radiation, surface temperature and temperature in the overpass. Test situations when hoar frost or a coating of ice has emerged have been related to typical weather in situations of high relative humidity (90 per cent or more). Comparing humidity and temperature shows that when temperature is falling humidity rises and vice versa. Overpasses have different skid inclinations. Of un-insulated sections the one with macadam is worst, because of its low thermal conductivity and capacity. Surface temperature and skid risk on insulated roads depend on several factors, e.g. thickness and depth of insulation. Skid risk is lower when insulation is put deeply into the overpass, but thickness affects surface temperature only marginally and skid risk is larger when the materials over the insulation have low thermal conductivity and capacity.

Media Info

  • Pagination: 58 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00346167
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: VTI/MEDDELANDE-207
  • Files: NTIS
  • Created Date: Jan 29 1982 12:00AM