Measurement of thermal conductivity of buffer materials and evaluation of existing correlations predicting it

Ould-Lahoucine, C.; Sakashita, Hiroto; Kumada, Toshiaki

doi:10.1016/s0029-5493(02)00033-x

Cited by 50 publications

(28 citation statements)

References 5 publications

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“…Several works have been done previously to study the thermal conductivity of compacted bentonites. Measured data can be found in the works of Villar (2000) on Febex bentonite, Ould-Lahoucine et al (2002) on Kunigel bentonite, Madsen (1998) on MX80 bentonite, Coulon et al (1987) on several smectite-based clays. These measurements show that the thermal conductivity of compacted bentonites depends on the dry density, the water content, and the mineralogical composition.…”

Section: Introductionmentioning

confidence: 99%

A study on the thermal conductivity of compacted bentonites

Tang

Cui

Lê

2008

Applied Clay Science

200

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Thermal conductivity of compacted bentonite is one of the most important properties in the design of high-level radioactive waste repositories where this material is proposed for use as a buffer. In the work described here, a thermal probe based on the hot wire method was used to measure the thermal conductivity of compacted bentonite specimens. The experimental results were analyzed to observe the effects of various factors (i.e. dry density, water content, hysteresis, degree of saturation and volumetric fraction of soil constituents) on the thermal conductivity. A linear correlation was proposed to predict the thermal conductivity of compacted bentonite based on experimentally observed relationship between the volumetric fraction of air and the thermal conductivity. The relevance of this correlation was finally analyzed together with others existing methods using experimental data on several compacted bentonites

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Section: Introductionmentioning

confidence: 99%

A study on the thermal conductivity of compacted bentonites

Tang

Cui

Lê

2008

Applied Clay Science

200

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“…Several experimental studies have examined the thermal behavior of geo-materials over different conditions including material composition, dry density, saturation, and temperature (Coulon et al 1987;Beziat et al 1988;Radhakrisha et al 1989;Suzuki et al 1992;Borgensson et al 1994;Graham et al 1997;Madsen 1998;Villar 2002;Ould-Lahoucine et al 2002;Engelhardt and Finsterle 2003;Tang et al 2008;Ye et al 2010;Man et al 2011;Kim et al 2012;Likos 2014;Lee et al 2016). Baumgartner et al (2006) estimated the thermal conductivity and specific heat capacity of bentonite materials based on their composition and density.…”

Section: R a F Tmentioning

confidence: 99%

Thermal properties of engineered barriers for a Canadian deep geological repository

Abootalebi

Siemens

2018

Can. Geotech. J.

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Global energy needs continue to rise along with society’s desire for carbon-reduced energy sources to limit climate change effects. One viable carbon-reduced energy source is nuclear power, which provides more than half the electricity requirements of the province of Ontario. Within Canada there are more than 2.5 million bundles of spent nuclear fuel, which will be stored in a deep geological repository. Efficiency of the repository system depends on dissipation of thermal energy. A comprehensive experimental study is presented on thermal properties of barrier materials. The influence of bentonite type, variability, moisture, and temperature on thermal properties is examined. Results show strong influence of moisture on thermal properties, some influence of temperature on low-density bentonite, minor influence of bentonite type, as well as low variability in the experimental measurements. The extensive database of physical measurements is compared with values from the literature and then used to statistically evaluate thermal property models selected from the literature. Using the base parameters from the literature, thermal property models performed adequately; however, soil-specific calibration of the model inputs improved the fit significantly. These results are now available to perform the numerical models for the proposed Canadian deep geological repository for used nuclear fuel.

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“…Ould-Lahoucine et al [40] used the following Equation (2) to model the thermal conductivity of bentonites,…”

Section: Comparison Of Two Major Types Of Empirical Modelmentioning

confidence: 99%

Experimental Study and Modelling of the Thermal Conductivity of Sandy Soils of Different Porosities and Water Contents

et al. 2017

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This paper at first reports an experimental work to test the thermal conductivity of formulated sandy soil specimens of different porosities and water contents. Both needle probe and hot-plate methods were conducted and compared. It has been confirmed that the needle probe method has a better accuracy for the measurement of unsaturated soil thermal conductivity, and that the pore size distribution plays an important role on unsaturated soil thermal conductivity. Secondly, it gives out an extensive review on the modelling work, and investigates two major types of empirical models in detail. Two generalized formulas have been suggested to mathematically characterise the two types of models and tested using the experimental data. Finally, in terms of the intrinsic relation to the pore size distribution and the similarity between the thermal conductivity and water retention characteristics of unsaturated soils, a soil water retention model has been suggested and tested to describe unsaturated soil thermal conductivity.

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Measurement of thermal conductivity of buffer materials and evaluation of existing correlations predicting it

Cited by 50 publications

References 5 publications

A study on the thermal conductivity of compacted bentonites

A study on the thermal conductivity of compacted bentonites

Thermal properties of engineered barriers for a Canadian deep geological repository

Experimental Study and Modelling of the Thermal Conductivity of Sandy Soils of Different Porosities and Water Contents

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