SURFACE ICING OF INSULATED PAVEMENTS

Because of its adverse effects on pavement structures, frost heaving is a major concern of highway engineers. One method proposed to eliminate it is embedding a layer of thermal insulation between the subbase course and subgrade to reduce heat loss from the subgrade and thus prevent subgrade moisture from freezing. New York State used polystyrene foam as insulation on three projects where frost heaving was known to be a problem. In all, 22 separate sections from 101- to 740-ft long were constructed. Surface icing was reported on two of the projects in December 1969. A thicker ice layer formed over the insulated sections than on adjoining uninsulated pavement. Ice on the former also lasted longer than over uninsulated pavement. This indicated that the former were 'colder' than the uninsulated. As a result, further use of subgrade insulation was suspended and this investigation initiated to determine if it could be the cause of the differential icing conditions. Using icing theory presented by Jumikis and a heat-transfer model derived by Dempsey and Thompson, the 'icing potential' of an insulated and an unisulated pavement section on one of the projects was computed for an entire winter season.

Media Info

  • Pagination: 57 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00090171
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NYSDOT-ERD-74-RR-24 Final Rpt.
  • Files: NTIS, TRIS, STATEDOT
  • Created Date: Apr 22 1975 12:00AM