METHODS OF LABORATORY AND FIELD MEASUREMENTS OF THERMAL CONDUCTIVITY OF SOILS

THE PROBE METHOD IS THE MOST APPLICABLE TECHNIQUE FOR RAPID MEASUREMENT OF THE THERMAL CONDUCTIVITY OF SOILS, BUILDING CONSTRUCTION AND INSULATION MATERIALS IN THE LABORATORY AND IN THE FIELD. IT IS SUITABLE FOR MEASUREMENTS OF DRY AND MOIST MATERIALS. MEASUREMENT TECHNIQUES FOR THE STUDY OF DRY MATERIALS ARE STRAIGHTFORWARD AND HAVE BEEN WELL-DOCUMENTED IN THE LITERATURE. TECHNIQUES FOR MEASUREMENT OF THE PROPERTIES OF MOIST MATERIALS ARE MORE COMPLEX, HOWEVER, WITH CONTROLLED PROBE DESIGN AND CAREFUL EXPERIMENTAL TECHNIQUE, VALID DATA CAN BE OBTAINED. THE GENERAL THEORY OF THE PROBE METHOD IS WELL-ESTABLISHED. EXTENSIONS OF THE THEORY WITH APPLICATION TO MOIST MATERIALS AND MATERIALS HAVING CONDUCTIVITY INHOMOGENEITIES SHOULD BE FURTHER ELABORATED. LABORATORY DATA OBTAINED FROM PROBE MEASUREMENTS ON DRY MATERIALS SHOULD BE REPRODUCIBLE TO WITHIN 1 TO 2 PERCENT, AND SHOULD AGREE TO WITHIN 4 PERCENT WITH DATA OBTAINED BY OTHER METHODS. FOR IN SITU MEASUREMENTS, ACCURACY OF THE RESULTS WILL DECREASE SLIGHTLY. LABORATORY DATA ON MOIST MATERIALS SHOULD BE REPRODUCIBLE TO WITHIN 4 PERCENT, AND THE ACCURACY SHOULD BE EQUAL TO, OR BETTER THAN, THAT OF OTHER MEASUREMENT TECHNIQUES. FIELD STUDIES USING PROBE METHODS SHOULD PROVIDE DATA WHICH IS MORE ACCURATE THAN THAT OBTAINED BY OTHER TECHNIQUES. ALSO, PROBES CAN OFTEN BE USED WHERE OTHER TECHNIQUES ARE IMPRACTICAL. THE PROBE METHOD CAN BE USED FOR BASIC STUDIES OF HEAT AND MASS TRANSFER IN SOIL AS WELL AS SPECIFIC MEASUREMENTS OF A PRACTICAL NATURE. IT CAN ALSO BE USED TO INDICATE CHANGES IN MOISTURE CONTENT OF MATERIALS BY EMPLACING PROBES IN SITU. INDIVIDUAL MEASUREMENTS BY THE PROBE METHOD CAN BE ACCOMPLISHED IN LESS TIME THAN THOSE INCURRED WITH OTHER MEASUREMENT TECHNIQUES. /AUTHOR/

  • Supplemental Notes:
    • No 82, 31 pP
  • Authors:
    • Wechsler, A E
    • Glaser, P E
    • Mcconnell, R K
  • Publication Date: 0

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  • Accession Number: 00228963
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 2:37AM