INSTRUMENTATION OF A LANDFILL COVER TO MEASURE DEPTH OF FROST PENETRATION

Frost penetration is a major environmental concern in landfill design. Freezing and thawing cycles may cause deterioration of the liner or cap, affecting permeability. The depth of frost penetration into the paper sludge cap at the Hubbardston Landfill in Massachusetts was measured by using a frost measurement system. A thermistor probe measured the temperature at various depths. Although temperature measurements are important, soil resistivity measurements are required to accurately predict the freezing level, since soil resistivity increases greatly on freezing. A conductivity probe measured the half bridge voltage between conductivity rings and a ground rod. Data were collected in data loggers. The data collected during the winter of 1992-1993 showed that the frost level did not penetrate the paper sludge capping layer. Heavy snow cover throughout the winter decreased the depth of frost penetration by insulating the landfill. The high water content in the sludge also contributed to the lack of freezing. One-dimensional freezing tests were conducted on the paper sludge in the laboratory by using the frost measurement system. Freezing of the material did occur, since soil resistivity increased steadily as the temperature decreased. It was shown that subzero temperatures are required to freeze the paper sludge.

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 44-49
  • Monograph Title: Innovations in instrumentation and data acquisition systems
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00668944
  • Record Type: Publication
  • ISBN: 0309055148
  • Files: TRIS, TRB
  • Created Date: Nov 8 1994 12:00AM