FREEZING MECHANISM AND PRESSURE CONDITION AT THE FREEZING FRONT

Theories concerning the freezing mechanism and the pressure condition at the frost line in porous materials concentrate on the capillarity and/or thermodynamic equilibrium between the phases ice/water. A mathematical expression is presented for the capillarity for water in a cylindrical pipe line as well as an equation describing the equilibrium between pressure and temperature at the frost line. The apparatus is described for measuring the heaving pressure and the suction in the porewater. The suction (sub pressure) in the pore water is observed by means of a pressure transducer in a closed system with no water intake during freezing. The grain size curves and capillarity of the five soils tested, are presented. The tests indicate that it is difficult to calculate the pressure condition at the frost line by means of the soil's capillarity. Soils with the same degree of frost susceptibility display great differences in heaving and sub pressure upon freezing. The clay content appears to have a great influence on the observed pressures. It is noticeable that the heaving pressures tend to be much greater than the corresponding suctions. However, it is probable that the observed pressures are not the soils real maximum values. It is doubtful whether the equipment used was sensitive enough for measuring the actual maximum pressure created by freezing of the soils.

  • Supplemental Notes:
    • Symposium on Frost Action on Roads, Paris (1973).
  • Corporate Authors:

    Organisation for Economic Co-operation and Development (OECD)

    2, rue André Pascal
    Paris,   France  75775 Paris Cedex 16
  • Authors:
    • Satersdal, R
  • Conference:
  • Publication Date: 1973-10

Media Info

  • Features: Figures;
  • Pagination: p. 365-373
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00260036
  • Record Type: Publication
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS
  • Created Date: Oct 5 1974 12:00AM