Rapid In Situ Measurement of Hydraulic Conductivity for Granular Pavement Foundations

This paper describes the application of a relatively new rapid in situ test device for measuring the hydraulic conductivity of granular pavement foundation materials. The test device uses air as the permeating fluid with compensations for fluid viscosity and unsaturated flow conditions. Because the test device allows for rapid measurement, many tests can be performed in a short time, which allows for statistical analysis of the results. Three different sections surfaced with crushed limestone subbase material were tested in this study. These test sections varied in support conditions beneath the subbase layer with cement-stabilized subgrade, geogrid at the subbase/subbase interface, and compacted subgrade (control section with no stabilization). Control section showed relatively high hydraulic conductivity on average and low amount of spatial variation. Cement-stabilized subgrade section showed relatively low hydraulic conductivity on average, and the geogrid reinforced section showed relatively high amount of spatial variation. The variations observed in hydraulic conductivity are directly related to the segregation and degradation of the base material, which occurred due to differences in the support conditions beneath the subbase layer and traffic loading.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 3005-3014
  • Monograph Title: Geo-Congress 2014 Technical Papers: Geo-Characterization and Modeling for Sustainability

Subject/Index Terms

Filing Info

  • Accession Number: 01522782
  • Record Type: Publication
  • ISBN: 9780784413272
  • Files: TRIS, ASCE
  • Created Date: Mar 25 2014 3:07PM