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

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Making a reading on a sample • Insert the needle • May need a pilot hole • Turn on the controller • Press Enter • Wait 5 – 10 minutes – controller heats needle, measures temperature, and computes k • Read the result from display
Example of k measurement Temp perature Ris se (C) 0.4 0.3 0.2 0.1 0 y = 0.0906x + 0.0564 R 2 = 0.9998 =153 C cm/W y = 0.0853x + 0.008 R 2 = 0.9996 =144 C cm/W 0 1 2 3 4 ln t or ln t/(t-t o ) heating cooling heating, excluded cooling, excluded
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 30 and 31: Contact Resistance Errors •Contac
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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