THE RELATION BETWEEN PERMEABILITY AND PORE SIXE DISTRIBUTION OF COMPACTED LAYEY SILTS

This study examines the relation between permeability and pore size distribution, and, the influence of varying water content and compaction effort on the soil fabric of compacted fine-grained soils. Three blends of silt and kaolin were compacted at different energy levels and water contents. Falling head tests under back pressure were used to measure permeability. The mercury intrustion technique was used to measure pore size distribution. Freeze Drying was used to minimize soil disturbance prior to mercury intrusion. A method of approximating the differential pore size distribution is described which simplifies the interpretation of pore size distributions. The soils tested were found to have a bimodal pore size distribution on a log diameter scale. Varying the compaction variables was at the expense of the large pore mode with little or no effect on the small pore mode. The permeability generally increased with increasing large pore mode. Empirical predictive equations for permeability based on pore size distribution parameters were determined for each of the soils tested. The pore size parameters used were based on theoretical models which relate permeability to pore size distribution. /FHWA/

  • Supplemental Notes:
    • Sponsored by the Indiana State Highway Commission. Prepared in cooperation with the Department of Transportation, Federal Highway Administration. Part of the study entitled The Effect of Pore Size Distribution on Permeability and Frost Susceptibility of Selected Sub-Grade Materials.
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Authors:
    • Garcia-Bengochea, I
  • Publication Date: 1978-4

Media Info

  • Pagination: 179 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188977
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: JHRP-78-4 Intrm Rpt.
  • Contract Numbers: 1(15) Part II
  • Files: TRIS, USDOT
  • Created Date: Apr 12 1979 12:00AM