STUDY OF SUBSURFACE TEMPERATURE IN SIX SOILS DURING THE WINTER OF 1953-1954 AND DISCUSSION

DURING THE WINTER OF 1953-54, SUBSURFACE TEMPERATURE MEASUREMENTS WERE PERFORMED ON SIX NEW JERSEY SOILS. THE STUDIES REVEALED THAT: (1) GRANULAR, NON-PLASTIC SOILS ARE BETTER CONDUCTORS OF HEAT (AND COLD) THAN FINE-GRAINED SOILS AND REACT TO AIR TEMPERATURE CHANGES MORE QUICKLY. OF THE SIX SOILS STUDIED, A CLEAN SAND (MRB A-3) WAS THE BEST CONDUCTOR AND AN MRB A-7-6 SOIL WAS THE POOREST CONDUCTOR. THEREFORE, FROST ENTERS AND GOES OUT OF GRANULAR SOILS MORE RAPIDLY THAN IN THE CASE OF FINE-GRAINED SOILS, CAUSING MORE FREQUENT FREEZE AND COMPLETE THAW CYCLES, (2) A CONCRETE SLAB IS A BETTER CONDUCTOR OF HEAT THAN SOIL OF THE SAME THICKNESS. THEREFORE, FREEZING AND COMPLETE THAW CYCLES OCCUR MORE OFTEN BELOW A CONCRETE SLAB OR PAVEMENT THAN IN THE ADJACENT SHOULDER, (3) A COMBINATION OF A CONCRETE SLAB OVER A GRANULAR SOIL IS ONE THAT REACTS MOST QUICKLY TO COLD AND WARM SPELLS. A SHOULDER OF FINE-GRAINED SOIL SHOWS LITTLE REACTION TO COLD AND WARM SPELLS (EXCEPT AT THE SURFACE) AND REFLECTS THE OVER-ALL INTENSITY OF COLD OF THE WINTER, (4) THE FREEZING LINE GENERALLY PENETRATES TO A GREATER DEPTH IN GRANULAR SOILS THAN IN FINE-GRAINED SOILS, (5) THERE IS A LAG BETWEEN THE MINIMUM AIR TEMPERATURE OF WINTER AND THE MAXIMUM PENETRATION OF THE 32 DEGREE LINE. IN THE CASES STUDIED THE LAG WAS ONE DAY, EXCEPT FOR SOME OF THE SHOULDERS OF FINE-GRAINED SOILS, WHERE THE LAG WAS SEVERAL DAYS, (6) MAXIMUM HEAVING DOES NOT NECESSARILY OCCUR AT THE TIME OF THE MAXIMUM DEPTH OF THE 32 DEGREE LINE, (7) MOST THAWING IN SOIL OCCURS FROM THE TOP DOWNWARD DURING THAW PERIODS, HOWEVER, SOME THAWING TAKES PLACE FROM THE BOTTOM, AND (8) TEMPERATURE STUDIES INDICATE THE NECESSITY OF MEASURING AND KNOWING THE SURFACE TEMPERATURE OF THE SLAB OR GROUND SURFACE. /AUTHOR/

Media Info

  • Monograph Title: Fundamental and practical concepts of soil freezing
  • Serial:

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Filing Info

  • Accession Number: 00237712
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 5 1994 12:00AM