A study on the thermal conductivity of compacted bentonites

Tang, Anh Minh; Cui, Yu‐Jun; Lê, Trung Tinh

doi:10.1016/j.clay.2007.11.001

Cited by 205 publications

(109 citation statements)

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“…This equation is inspired in the formulation of De Vries's (1963) which according to Tang et al (2008) provides the best fit to measured thermal conductivity data for several bentonites, including the FEBEX bentonite. The formulation in Eq.…”

Section: Energy Balancementioning

confidence: 99%

A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

Zheng

Samper

Montenegro

2011

Journal of Contaminant Hydrology

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The performance assessment of a geological repository for radioactive waste requires quantifying the geochemical evolution of the bentonite engineered barrier. This barrier will be exposed to coupled thermal (T), hydrodynamic (H), mechanical (M) and chemical (C) processes. This paper presents a coupled THC model of the FEBEX (Full-scale Engineered Barrier EXperiment) in situ test which accounts for bentonite swelling and chemical and thermal osmosis. Model results attest the relevance of thermal osmosis and bentonite swelling for the geochemical evolution of the bentonite barrier while chemical osmosis is found to be almost irrelevant. The model has been tested with data collected after the dismantling of heater 1 of the in situ test. The model reproduces reasonably well the measured temperature, relative humidity, water content and inferred geochemical data. However, it fails to mimic the solute concentrations at the heater-bentonite and bentonite-granite interfaces because the model does not account for the volume change of bentonite, the CO 2 (g) degassing and the transport of vapor from the bentonite into the granite. The inferred HCO 3 -and pH data cannot be explained solely by solute Page 2 of 54 transport, calcite dissolution and protonation/deprotonation by surface complexation, suggesting that such data may be affected also by other reactions.

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Section: Energy Balancementioning

confidence: 99%

A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

Zheng

Samper

Montenegro

2011

Journal of Contaminant Hydrology

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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%

“…Barry-Macaulay et al (2015) also suggested that existing models may be improved upon using soil-specific calibration of the model inputs. Tang et al (2008) examined bentonite thermal data and found that thermal conductivity varied linearly with the volume fraction of air. Ideally thermal models for numerical models for deep geologic repositories would have an experimental basis, which is used to calibrate thermal conductivity constitutive models.…”

Section: R a F Tmentioning

confidence: 99%

“…Estimations consisted of a series of sinusoidal curves for thermal conductivity and specific heat capacity as a function of degree of saturation. Barry-Macaulay et al (2015) and Tang et al (2008) reviewed an extensive number of thermal conductivity predictions and evaluated selected thermal conductivity models (Johansen 1975;Cote and Konrad 2005;Lu et al 2007;Sakashita and Kumada 1998;among others). Both papers noted the correlation between quartz content and thermal conductivity.…”

Section: R a F Tmentioning

confidence: 99%

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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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“…These bentonites contain mainly montmorillonite, which is an essential mineral to ensure sealing properties. Beside the montmorillonite, there is quartz, which is also an important mineral for its particular in‰uence on thermal conductivity (Tang et al, 2008b). Note that a high thermal conductivity of the engineered barrier allows the heat to dissipate quickly from the canisters, consequently reducing the maximum temperature in the EBS.…”

Section: Introductionmentioning

confidence: 99%