ENGINEERING PROPERTIES OF COMPACTED CLAY CONDITIONED BY SATURATION AND FREEZE-THAW CYCLES

This research quantitatively evaluates the effect of saturation and freeze-thaw cycles on the rheological characteristics of a compacted subgrade. Kaolin samples compacted by 25, 40, and 80 blows of a drop hammer were tested over a wide range of moisture contents and densities. The failure and rheological parameters investigated that relate to soil strength are unconfined compressive strength, modulus of elasticity, creep modulus, and complex elastic modulus. Laboratory compacted samples were saturated under controlled boundary stress conditions in a specially designed chamber and were then subjected to non freeze-thaw cycles before testing. Results show that volumetric swelling, although less than the volume of absorbed water, increases as compaction energy increases and that soil structure also changes under saturation and freeze-thaw cycles. Rheological parameter values seem to be independent of the compaction energy levels used. Results also show that compacted cohesive subgrades exposed to saturation and freeze-thaw cycles in the field will experience major reductions in load-carrying capacity. Therefore, it is recommended that the design of rigid and flexible pavements over cohesive subgrades for areas in which cyclic freezing and thawing occurs should focus greater attention on providing adequate subgrade drainage so that initial saturation of the subgrade is minimized.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 14-29
  • Monograph Title: FROST, MOISTURE, AND EROSION
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00099651
  • Record Type: Publication
  • ISBN: 0309023807
  • Files: TRIS, TRB
  • Created Date: Nov 5 1975 12:00AM