Th l R i ti it f S il Thermal Resistivity of Soils and Engineered Materials

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Contact Resistance Errors •Contact resistance errors occur any time there is an air gap around a single needle probe •No simple correction is possible •Long read times minimize these errors •Worst W in dry materials •Thermal grease sometimes helps
Standards for thermal conductivity or resistivity • ASTM D 5334-08 (2008) Standard test methods for determination of thermal conductivity of soil and soft rock by thermal needle probe procedure. Vol. 04.08, 08 ASTM, 100 Barr-Harbor Dr., West Conshocken, PA 19428-2059. • IEEE STD 442-1981 IEEE guide for Thermal Resistivity it Measurements . The Institute t of Electrical and Electronics Engineers, Inc. 345 East 47 Street, New York, NY 10017 • Bristow, K. 2002 . Thermal Conductivity it . p1209- 1226. Methods of Soil Analysis. Part 4 Soil Science Society of America, Inc. 677 South Segoe Rd. Madison, WI 53711-1086 1086.
Page 1 and 2: Thermal Resistivity it of Soils and
Page 3 and 4: TECP Purpose •Measure thermal and
Page 5 and 6: Thermal Properties of Soil Impact W
Page 8 and 9: Outline •Definitions •Thermal p
Page 10 and 11: Which is best, conductivity or resi
Page 12 and 13: Modeling Soil Thermal Properties
Page 14 and 15: Thermal properties of “pure” so
Page 16 and 17: Specific Heat Take-Home • The vol
Page 18 and 19: Liquid Return Flow: soil as a heat
Page 20 and 21: Response to Thermal Conductivity of
Page 22 and 23: Response to Compaction 2 The ermal
Page 24 and 25: Take-home • Thermal conductivity
Page 26 and 27: Line heat source methods for therma
Page 28 and 29: Making a reading on a sample • In
Page 32 and 33: Comparison of standards ASTM IEEEla
Page 34 and 35: Thermal dryout curves •The relati
Page 36 and 37: Dryout curves on Sand uctivity (W /
Page 38 and 39: Sand data on a resistivity scale Th
Page 40 and 41: Measuring thermal conductivity of c
Page 42 and 43: Measuring thermal conductivity of c
Page 44 and 45: Conclusions • “Measure to Know

Th l R i ti it f S il Thermal Resistivity of Soils and Engineered Materials

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