SUCTION MEASUREMENTS ON COMPACTED TILL SPECIMENS AND INDIRECT FILTER PAPER CALIBRATION TECHNIQUE

Standard AASHTO compacted specimens were used to provide a constant-suction environment for an indirect calibration of filter paper sensors. The suctions of the compacted till specimens were measured with tensiometers, thermal conductivity matric suction sensors, and psychrometers. The compacted specimens had essentially constant degrees of saturation at water contents greater than optimum. The matric suction of specimens compacted greater than optimum were observed to vary linearly with the water content and the void ratio (i.e., matric suction varies directly with dry density and inversely with water content). Filter paper sensors in good contact with specimens compacted greater than optimum were found to yield a more consistent calibration curve than filter paper sensors that were not in contact with the soil. Calibration curves obtained showed that the transition from where liquid flow is dominant to where vapor flow is dominant occurs at approximately 20 to 90 kPa.

Language

  • English

Media Info

  • Features: Figures; References;
  • Pagination: p. 3-9
  • Monograph Title: Environmental moisture effects on transportation facilities and nonearth materials' thermal effects on pavements
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00712974
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 10 1995 12:00AM