Thermal expansion, diffusivity, and cracking of rock cores from Darlington, Ontario

1982 ◽  
Vol 19 (2) ◽  
pp. 154-166 ◽  
Author(s):  
K. Y. Lo ◽  
R. S. C. Wai
Keyword(s):  
Thermal Expansion ◽  
Thermal Diffusivity ◽  
Threshold Temperature ◽  
Deep Hole ◽  
Velocity Measurements ◽  
Granitic Gneiss ◽  
Rock Types ◽  
Rock Cores ◽  
Rate Of Heating ◽  
Mineral Constituents

Measurements of the thermal diffusivity and expansion coefficient for rock cores of a limestone and granitic gneiss, recovered from a deep hole at Darlington Generating Station, Ontario were carried out. Results showed that the diffusivity decreases whereas the coefficient of expansion increases with temperature for both rock types. Thermal cracking occurs above a threshold temperature that is independent of the rate of heating as indicated by wave velocity measurements; this appears to be a result of thermal mismatch of the mineral constituents. These results are of direct relevance to the design of underground facilities in energy-related projects.

Thermal expansion and thermal diffusivity properties of Co-Si solid solutions and intermetallic compounds

2016 ◽  
Vol 102 ◽  
pp. 1-8 ◽  
Author(s):  
Ying Ruan ◽  
Liuhui Li ◽  
Qianqian Gu ◽  
Kai Zhou ◽  
Na Yan ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Thermal Diffusivity ◽  
Intermetallic Compounds ◽  
Solid Solutions

scholarly journals Spindigtheidsgolfgedrag van Cr-Si- en Cr-Ga-allooi-enkelkristalle

2000 ◽  
Vol 19 (1) ◽  
pp. 21-22
Author(s):  
A. R. E. Prinsloo
Keyword(s):  
Electrical Resistivity ◽  
Thermal Expansion ◽  
Phase Diagrams ◽  
Single Crystals ◽  
Spin Density ◽  
Ultrasonic Wave ◽  
Magnetic Phase ◽  
Density Wave ◽  
Spin Density Wave ◽  
Velocity Measurements

The spin-density-wave (SDW) effects in Cr-Si and Cr-Ga alloy single crystals were investigated by means of thermal expansion, electrical resistivity and ultrasonic wave velocity measurements. The complete temperature-concentration and temperature-pressure magnetic phase diagrams of Cr-Ga were constructed.

Linear thermal expansion, thermal diffusivity and melting temperature of Am-MOX and Np-MOX

2015 ◽  
Vol 637 ◽  
pp. 326-331 ◽  
Author(s):  
D. Prieur ◽  
R.C. Belin ◽  
D. Manara ◽  
D. Staicu ◽  
J.-C. Richaud ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Thermal Diffusivity ◽  
Melting Temperature ◽  
Linear Thermal Expansion

The soil clays of Great Britain: II. Scotland

Clay Minerals ◽  
1984 ◽  
Vol 19 (5) ◽  
pp. 709-735 ◽  
Author(s):  
M. J. Wilson ◽  
D. C. Bain ◽  
D. M. L. Duthie
Keyword(s):  
Clay Minerals ◽  
Clay Mineralogy ◽  
Parent Material ◽  
Granitic Gneiss ◽  
Parent Materials ◽  
Red Sandstone ◽  
Rock Types ◽  
Soil Parent Material ◽  
Soil Clays ◽  
Lower Palaeozoic

AbstractThe soils of Scotland are relatively young, being developed mainly on glacial drift deposited some 10 000 years ago. Only a small number of genetic soil types are represented, but this is more than compensated for by the wide variety of parent materials from which the drift ultimately derives. The major parent materials include granite and granitic gneiss, gabbro, basalt/andesite, mica-schist and related metamorphic rock types, Lower Palaeozoic greywackes and shales, Old Red Sandstone sediments, Carboniferous sediments, fluvioglacial sands and gravels, and estuarine silts and clays. The clay mineralogy of the soil associations developed on these parent materials is described and the origin of the clay minerals is interpreted. It is concluded that the influence of inheritance is predominant, but that the effects of pre-glacial weathering and Holocene pedogenesis can also be discerned. Inheritance has contributed a wide variety of clay minerals to the soils, including illite, kaolinite, chlorite, smectite and a number of interstratified minerals, pre-glacial weathering has resulted in the widespread formation of kaolinite and halloysite, irrespective of soil parent material or drainage class, and recent pedogenesis has brought about the transformation of inherited layer silicates by vermiculitization processes, with concomitant interlayer alumination, particularly in surface horizons.

The Mid-Atlantic Ridge Near 45 °N. XXII. Sedimentary Deposition and Lithogenesis on Mid-Atlantic Ridge Mountain Tops

1974 ◽  
Vol 11 (8) ◽  
pp. 1157-1167 ◽  
Author(s):  
Charles T. Schafer
Keyword(s):  
Surface Sediments ◽  
Bottom Current ◽  
Current Direction ◽  
Sediment Distribution ◽  
Rock Types ◽  
Rock Cores ◽  
Rapid Changes ◽  
Unconsolidated Sediment ◽  
Mid Atlantic Ridge ◽  
Coralline Limestone

Bottom photographs and drilled rock cores collected on several mountain tops along the crest of the Mid-Atlantic Ridge near 45°N describe the sediment distribution, sediment dynamics and shallow stratigraphy of these sites. Lag pebble deposits and pebble waves indicate rapid changes in bottom current direction and velocities that may approach 100 cm/s (>2 knots) one meter above the bottom so that surface sediments are often not indicative of sediment and rock types sampled using shallow drilling techniques. Absolute dates (14C) of coralline limestone, which underlies coarse unconsolidated sediment at most drilling sites, suggest deposition and initial lithification of these deposits during a middle Wisconsin interstadial period.

The Abnormal Melting of Raw Rubber

1949 ◽  
Vol 22 (2) ◽  
pp. 299-309
Author(s):  
Akira Isihara
Keyword(s):  
Thermal Expansion ◽  
Relaxation Time ◽  
Heating Rate ◽  
Relaxation Times ◽  
Previous History ◽  
Time Interval ◽  
Time Rate ◽  
Vulcanized Rubber ◽  
Rate Of Heating ◽  
Amorphous Particles

Abstract The experimental results on the abnormal melting of crystallized raw rubber by Wood and Bekkedahl are studied theoretically. The effect can be explained by the fact that the relaxation time for the thermal expansion of crystalline particles differs from that of amorphous particles. At the point where the melting begins, the time interval of observation becomes comparable to the relaxation time of amorphous particles. The point becomes higher as the time rate of heating increases, and also as the relaxation time itself becomes larger. The point at which fusion is complete is determined by the relaxation times of the amorphous and crystallized states, heating rate, and previous history. This effect becomes large at a suitable heating rate, and is larger in natural rubber than in vulcanized rubber.

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