REMOTE FROST DEPTH MONITORING

Three frost depth indicators were developed for use in establishing load restrictions. The first made use of ground resistivity. Since frozen and thawed ground have greatly difering resistivity, this property can easily be used to differentiate between the two. The second system passed thhrough a computer. The third system uses a thermistor in a balance bridge. Whenever the temperature of the thermistor deviates from a preset temperature, say 32 degree F, the bridge becomes unbalanced causing an electronic switch to be closed. The last system appears most reliable but it has not been thoroughly tested. The first two systems have inherent problems which may or may not be overcome. (Author)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 16 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00395669
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-AK-RD-85-13 Final Rpt.
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Feb 28 1986 12:00AM