The thermal diffusivity of eight well-characterized rocks for the temperature range 300–1000 K
✍ Scribed by E.J. Hanley; D.P. Dewitt; R.F. Roy
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 804 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0013-7952
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✦ Synopsis
Hanley, E.J., DeWitt, D.P. and Roy, R.F., 1978. The thermal diffusivity of eight wellcharacterized rocks for the temperature range 300--1000 K. Eng. Geol., 12: 31--47.
The objectives of this research were to make accurate measurements of thermal diffusivity at normal and elevated temperatures on eight well-characterized rocks and to investigate the effects of water saturation and heating upon thermal diffusivity. The eight rock types studied were Barre Granite, Dresser Basalt, St. Cloud Granodiorite, Westerly Granite, Berea Sandstone, Holston Marble, Salem Limestone, and Sioux Quartzite. A summary geologic description and chemical analysis of each rock type is included. The thermal diffusivity measurements were made at one atmosphere pressure using the laser flash method. In the natural, air-dried state at 300 K the values of diffusivity ranged from about 0.280 cm 2 sec-' for the quartzite to 0.0114 cm ~ sec-' for the limestone. Thermal diffusivity varies inversely with temperature and at 800 K the value is 50 to 75% lower than at room temperature. At room temperature, rocks saturated with water increase in diffusivity as much as 24 percent. Several qualitative trends were observed relating the thermal diffusivity of rock to its composition, texture and structure.