SEGREGATION POTENTIAL - PRESSURE - SALINITY RELATIONSHIPS NEAR THERMAL STEADY STATE FOR A CLAYEY SILT

Laboratory freezing tests were performed on a saturatted clayey silt at various pore-water salinities and applied pressures to establish the relationships between pore-water salinity, overburden, and the amount of moisture transfer during freezing near thermal steady state conditions. The experimental data confirmed that the concept of segregation potential established for salt-free soils can be extended to saline soils. The segregation potential at the onset of the final ice lens in step-freezing tests (or near thermal steady state) should be related to the average salinity of the frozen fringe associated with the final ice lens. This pore-water salinity is different from the initial pore-water salinity as a result of solute exclusion at the ice lenses causing an enrichment as freezing proceeds. Unfortunately, it is very difficult to determine the average salinity in the frozen fringe owing to its small size. Instead, it is proposed to use the initial water salinity to develop the constitutive equations in freezing saline soils. A procedure for frost heave predictions in the field is outlined.

• Corporate Authors:

  National Research Council of Canada

  Research Journals
  Ottawa, Ontario K1A 0R6,   Canada 
• Authors:
  • KONRAD, J-M
• Publication Date: 1990-4

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 203-215
• Serial:
  • CANADIAN GEOTECHNICAL JOURNAL
  • Volume: 27
  • Issue Number: 2
  • Publisher: National Research Council of Canada

Subject/Index Terms

• TRT Terms: Forecasting; Freezing; Frost heaving; Ice formations; Overburdens; Pore water; Salinity; Silts; Silty clays
• Uncontrolled Terms: Ice lenses
• Old TRIS Terms: Clayey silt; Freezing tests; Frost heave
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00495636
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 31 1990 12:00AM