TEMPERATURE EFFECTS ON THE COMPACTION AND STRENGTH OF A SANDY CLAY

THE COMPACTION AND STRENGTH CHARACTERISTICS OF A SANDY CLAY WERE STUDIED IN THE LABORATORY OVER A TEMPERATURE RANGE OF 35 TO 85 F. THE SOIL WAS COMPACTED WITH THE HARVARD MINIATURE DEVICE AT THREE EFFORT LEVELS AND AT FOUR WATER CONTENTS MATCHED TO EACH LEVEL, WHICH PRODUCED PEAK DENSITIES OF ABOUT 93 PERCENT, 95 PERCENT AND 98 PERCENT OF THAT PRODUCED BY THE STANDARD AASHO TEST. SAMPLES WERE CURED FOR FIVE DAYS TO ELIMINATE TRANSIENT STRENGTH EFFECTS AND WERE THEN TESTED IN UNDRAINED UNIAXIAL COMPRESSION. THE ANALYSIS OF VARIANCE METHOD (ANOVA) WAS USED TO ANALYZE THE DATA. THE FIXED ANOVA STATISTICAL MODEL I WAS APPLIED TO A COMPLETE FACTORIAL EXPERIMENTAL DESIGN WITH PARTIAL NESTING. THE FOUR INDEPENDENT VARIABLES STUDIED WERE: (1) COMPACTION EFFORT, (2) WATER CONTENT, (3) COMPACTION TEMPERATURE, AND (4) STRENGTH TESTING TEMPERATURE. SIX DEPENDENT VARIABLES WERE CONSIDERED: (1) DRY UNIT WEIGHT, (2) UNCONFINED COMPRESSIVE STRENGTH, (3) AXIAL STRAIN AT PEAK STRESS, (4) INITIAL TANGENT MODULUS, (5) SECANT MODULUS TO PEAK STRESS AND (6) SECANT MODULUS TO ONE-HALF THE PEAK STRESS. AN ANOVA WAS PERFORMED TO DETERMINE WHICH INDEPENDENT VARIABLES AND INTERACTIONS WERE SIGNIFICANTLY RELATED TO EACH DEPENDENT VARIABLE. THE COMPACTION TEMPERATURE HAD A SIGNIFICANT EFFECT. A DECREASE IN COMPACTION TEMPERATURE, HOLDING ALL OTHER FACTORS CONSTANT, PRODUCED LOWER UNIT WEIGHT, STRENGTH, AND STIFFNESS. THE TESTING TEMPERATURE HAD A STATISTICALLY SIGNIFICANT EFFECT ON UNCONFINED COMPRESSIVE STRENGTH, AND SECANT MODULUS TO PEAK STRESS. THESE VARIABLES GENERALLY INCREASED WITH DECREASING TESTING TEMPERATURES, BUT THE EFFECT WAS OBSCURE AT THE HIGHER WATER CONTENTS. THE TEMPERATURE AFFECTS THE COMPACTION PROCESS AND THE STRENGTH CHARACTERISTICS OF THE COMPACTED SOIL IN TWO WAYS: (1) THE COMPACTION TEMPERATURE INFLUENCES THE DENSITY AND STRUCTURE OF THE COMPACTED PRODUCT, AND (2) THE TESTING TEMPERATURE INFLUENCES THE PORE WATER PRESSURES DURING SHEAR. IT WAS FOUND THAT THE STRENGTH AND STIFFNESS OF SOIL TESTED AT ONE TEMPERATURE, BUT COMPACTED AT DIFFERENT TEMPERATURES, INCREASED WITH INCREASING COMPACTION TEMPERATURE. FOR SOIL COMPACTED AT THE SAME TEMPERATURE THE STRENGTH AND STIFFNESS INCREASED WITH DECREASING TEST TEMPERATURE. AVAILABLE EVIDENCE SUGGESTS THERE IS NO MAJOR DETERRENT TO COMPACTION OF CLAYEY SOILS IN A COLD, BUT UNFROZEN, CONDITION.

  • Supplemental Notes:
    • No 38, 17 PP, 4 FIG, 2 TAB, 17 REF
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Authors:
    • Highter, W H
    • Altschaeffl, A G
    • Lovell, C W
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00232800
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 2 1970 12:00AM