PERFORMANCE OF SOIL-AGGREGATE-FABRIC SYSTEMS IN FROST-SUSCEPTIBLE ROADS, LINN COUNTY, IOWA

Results of a three-year laboratory and field evaluation of a first-generation geotechnical construction fabric applied in soil-aggregate and granular-surfaced low-volume roadways indicate that fabric systems can, under certain circumstances, reduce thaw-induced deformations and improve field performance. Eleven test sections that involved different soil-aggregate-fabric systems were constructed on subgrades that displayed varying degrees of frost-related performance. Field evaluations were conducted over three-cycles of spring thaw plus summer healing. Laboratory simulation of freeze-thaw action along with strength and deformation parameters obtained through the Iowa K-test were used on a fabric-reinforced, frost-susceptible soil to provide insight into soil-fabric mechanisms and the potential for predicting field performance. Variation in the constructed soil-aggregate-fabric systems was achieved by locating fabric at different positions relative to layers of soil-aggregate or existing roadway materials, a choked macadam base course, and a thick granular backfill. Improvement was most noticeable where fabric was used as a reinforcement between a soil-aggregate surface and a frost-prone subgrade. Fabric used in conjunction with granular backfill, macadam base, and non-frost-susceptible subgrade did not appear justifiable. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 6-14
  • Monograph Title: General soils problems
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00348890
  • Record Type: Publication
  • ISBN: 0309032695
  • Files: TRIS, TRB
  • Created Date: Oct 30 1982 12:00AM