EQUIPMENT FOR MEASURING THE WATER PERMEABILITY AS A FUNCTION OF DEGREE OF SATURATION FOR FROST SUSCEPTIBLE SOILS

Equipment has been developed for measuring the water permeability as a function of degree of saturation on laboratory compacted soil samples. The apparatus can be operated at hydrostatic pressure up to 7/kg/cm squared. The water flow system was designed for continuous uninterrupted flow at high pressure and for manual monitoring of inflow and outflow rates. Permeabilities between 10 one-hundredth and 10 one millionth cm/sec can be measured. The limit on the pressure differential (average water pressure minus air pressure) is 6 kg/cm squared. The prototype equipment developed was used to design and build an operational unit which is in use at the Research Laboratory, Department of Transportation, Commonwealth of Pennsylvania. Thirty-three successful tests on selected soils were completed. The turn around time for a test using only one cell is three days. The data showed that the permeability was reproducible to better than a factor of two which was deemed adequate because the permeability changed several orders of magnitude as a function of the pressure differential during any one test. Based on the K-versus pressure differential characteristic, the frost susceptibility of the soils tested was predicted and compared with predictions obtained from CRREL and MASS freezing test procedures. /NTIS/

  • Availability:
  • Corporate Authors:

    Massachusetts Institute of Technology

    Department of Civil Engineering, 77 Massachusetts Avenue
    Cambridge, MA  USA  02139
  • Authors:
    • Wissa, AEZ
    • Martin, R T
    • Koutsoftas, D
  • Publication Date: 1972-12

Media Info

  • Pagination: 100 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00263212
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • ISBN: 44DI-044
  • Report/Paper Numbers: Final Rpt.
  • Files: TRIS, USDOT
  • Created Date: Nov 12 1974 12:00AM