EFFECT OF ORGANIC TOPSOIL CONTENT ON STRESS-STRAIN CHARACTERISTICS OF A TILL SUBJECTED TO RESPECTIVE LOADINGS

TO DETERMINE IF A PROGRAM OF SELECTED USAGE OF ORGANIC A-HORIZON SOIL (TOPSOIL) FOR HIGHWAY SUBGRADES WAS TECHNICALLY FEASIBLE, REPETITIVE CONSTANT-STRESS TRIAXIAL TESTS WERE CONDUCTED ON COMPACTED MIXTURES OF TILL AND TWO TYPES OF TOPSOIL. RELATIONS BETWEEN TOPSOIL CONTENT AND ATTERBERG LIMITS, RESIDUAL STRAIN, RESILIENT STRAIN, AND RESILIENT MODULUS WERE ESTABLISHED. AS TOPSOIL CONTENT INCREASED, LIQUID AND PLASTIC LIMITS, OPTIMUM WATER CONTENT, AND RESIDUAL AND RESILIENT AXIAL STRAINS INCREASED BUT MAXIMUM DRY DENSITY AND RESILIENT MODULUS DECREASED. THE MAGNITUDE OF THESE EFFECTS VARIED WITH THE ORGANIC CARBON CONTENT OF TOPSOIL. ADDITION OF TOPSOIL INITIALLY INCREASED THE RESILIENT MODULUS BUT THE GAIN FELL RAPIDLY AS MORE THAN 5 TO 10 PERCENT TOPSOIL WAS ADDED. AS AN INITIAL STUDY, THIS INVESTIGATION SHOWED THAT SELECTED A- AND C- HORIZON SOIL MIXTURES COULD BE USED IN SUBGRADES. HOWEVER, FURTHER RESEARCH INTO SUCH IMPORTANT CHARACTERISTICS AS OPEN-SYSTEM FREEZE-THAW BEHAVIOR IS REQUIRED BEFORE DESIGN LIMITATIONS CAN BE ESTABLISHED. /AUTHOR/

  • Corporate Authors:

    Saskatchewan Dept Hwys, Regina /Canada

    ,    
  • Authors:
    • CULLEY, R W
  • Publication Date: 1971-1

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 64 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00236908
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: R&d Rpt
  • Files: TRIS
  • Created Date: Apr 23 1973 12:00AM