EFFECT OF TEMPERATURE ON SOME ENGINEERING PROPERTIES OF CLAY SOILS

THE ENGINEERING PROPERTIES OF SOILS ARE GENERALLY MEASURED IN THE LABORATORY AT ROOM TEMPERATURE. HOWEVER, SEASONAL CHANGES MODIFY THE THERMAL ENVIRONMENT OF THE SOILS IN THE FIELD AND THEREFORE A CONCERN AS TO THE TYPE AND DEGREE OF INFLUENCE OF THE TEMPERATURE CHANGES ON THE ENGINEERING PROPERTIES OF SOILS IS JUSTIFIABLY EXPRESSED. IN AN ATTEMPT TO ASSESS THIS INFLUENCE, LABORATORY STUDIES WERE CONDUCTED ON FOUR CLAY SOILS-A KAOLINITIC, AN ILLITIC, A MONTMORILLONITIC, AND A MONTMORILLONITIC-ILITIC- AT TEMPERATURES OF 35, 70, AND 105 F WITH PLUS OR MINUS 2 F DEVIATION. THE STANDARD LABORATORY TESTS WERE RUN ON REMOLDED SPECIMENS OF SOILS COMPACTED AT THEIR MAXIMUM DENSITY AND OPTIMUM MOISTURE CONTENT, AND INCLUDED THOSE TESTS NECESSARY TO EVALUATE THE VERY FUNDAMENTAL PROPERTIES OF LIQUID LIMIT, PLASTICITY INDEX, UNCONFINED COMPRESSIVE STRENGTH, AND CONSOLIDATION. IN ALL FOUR SOILS THE LIQUID LIMIT DECREASED WITH AN INCREASE IN TEMPERATURE. THE PLASTICITY INDEX FOLLOWED THE SAME TREND WITH THE EXCEPTION OF THE KAOLINITIC SOIL, IN WHICH THE PLASTICITY INDEX SHOWED A SLIGHT INCREASE WITH TEMPERATURE INCREASE. THE UNCONFINED COMPRESSIVE STRENGTH DATA, CONTRARY TO OTHER ESTABLISHED DATA, INDICATED AN INCREASE IN STRENGTH WITH AN INCREASE IN TEMPERATURE. THE ILLITIC SOIL, HOWEVER, DEVIATED FROM THIS TENDENCY BY SHOWING A PARABOLIC TYPE BEHAVIOR WITH THE HIGHEST VALUE AT 72 F. THE VOID RATIO-PRESSURE RELATIONSHIPS RESULTED IN A FAMILY OF SOMEWHAT PARALLEL CURVES. FOR THE KAOLINITIC AND MONTMORILLONITIC SOILS THE CURVES AT LOW TEMPERATURE WERE FOUND TO BE ABOVE THOSE AT HIGH TEMPERATURE. ON THE OTHER HAND, FOR THE ILLITIC AND MONTMORILLONITIC-ILLITIC SOILS THE VOID RATIO-PRESSURE CURVE AT 105 F WAS BETWEEN THE 72 F AND 35 F CURVES, WITH THE 72 F CURVE OCCUPYING THE LOWEST LEVEL. IT IS CONCLUDED THAT SINCE SLIGHTLY HIGHER DENSITIES WERE OBSERVED WITH TEMPERATURE INCREASES, THE THERMAL ENERGY EFFECTS WERE OVERCOMPENSATED. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 186-193
  • Monograph Title: Effects of temperatures and heat on engineering behavior of soils
  • Serial:

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Filing Info

  • Accession Number: 00237765
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Aug 25 1994 12:00AM