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Title: 砂および砕石の熱拡散係数について
Other Titles: On the Thermal Diffusivity of Sand and Crushed Stone
Authors: 武政, 剛弘 / 深田, 三夫
Authors (alternative): Takemasa, Takehiro / Fukada, Mitsuo
Issue Date: Dec-1974
Publisher: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
Citation: 長崎大学工学部研究報告, (5), pp.69-74; 1974
Abstract: The temperature in the soil near the ground surface is determined by the thermal characteristics of soil and thermal flux between the soil and adjacent atmosphere. Now, we consider the thermal diffusivity α, being one of the thermal characteristics. For example, we consider the frost penetration problem in highway soils. If it were possible to decrease the thermal diffusivity from, say, α=10.3x10-3 (cm2/sec) to α=7.7 X 10-3 (20%), then the frost penetration depth decreases approximately 13.0% as compared with α=1 0 .3 X 10-3. If diffusivity could be decreased from α=7.7 X 1'0-3 to 5.2 X 10-3 (33%), the frost penetration depth would be decreased by an : mount of approximately 19%. Thus, the thermal property diffusivity α, seems to be various factors of economic importance in building or repairing the road and the frost penetration in road. We calculate the thermal diffusivity α from the data obtained by observing the temperatures in sand and crushed stones in the holes being made artificially in the field.
URI: http://hdl.handle.net/10069/23820
ISSN: 02860902
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No.5

Citable URI : http://hdl.handle.net/10069/23820

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