Advances on the knowledge of the buffer/backfill properties of heavily-compacted GMZ bentonite

Ye, Weimin; Chen, Yong-Gui; Bao, Changchun; Wang, Qiong; Ju, Wang

doi:10.1016/j.enggeo.2010.06.002

Cited by 201 publications

(50 citation statements)

References 45 publications

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“…This test is based on a Transient Plane Source Technology, which allows for measurement of thermal conductivity, thermal diffusivity as well as volumetric heat capacity during a single test. This technology has been successfully used for measuring thermal properties of compacted bentonite (Ye et al 2010;Lee et al 2016). The method provides efficient and accurate thermal property measurements at laboratory and elevated temperatures as well as flexibility to test brittle samples in the compaction mould (see one-sided method below).…”

Section: Thermal Property Device and Test Proceduresmentioning

confidence: 99%

“…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%

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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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Section: Thermal Property Device and Test Proceduresmentioning

confidence: 99%

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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“…GMZ Bentonite is bedded, with a soapy texture and waxy appearance. The Cation Exchange Capacity (CEC) of GMZ bentonite is showed in Table1 (Ye et al, 2010). Some basic physical properties of GMZ bentonite are presented in Table 2.…”

Section: Introductionmentioning

confidence: 99%

Investigation on hydraulic properties of compacted GMZ bentonite used as buffer/backfill material

Xin

Chen

et al. 2016

E3S Web Conf.

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Abstract. During the past decades, GMZ bentonite has been widely investigated for its use as buffer/backfill materials in China. Based on a comprehensive review of the former studies, achievements on experimental and theoretic works on the hydraulic aspects of compacted GMZ bentonite with consideration of temperature effects are presented in this paper. Water retention property of compacted GMZ bentonite depends on constraint conditions. Temperature effects on water-retention depend on constraint conditions and suction. The hysteresis behaviour is not obvious. Based on the test results, a revised water retention model was developed for considering the temperature effect. The saturated hydraulic conductivity of the densely compacted GMZ bentonite increases as dry density and temperature increases. A revised model, which considers temperature influence on water viscosity and the effective flow cross-sectional area of porous channels, for prediction of saturated hydraulic conductivity have been developed and verified. The unsaturated hydraulic conductivity of confined densely compacted GMZ bentonite samples decreases first and then increases with suction decrease from an initial value of 80 MPa to zero. With consideration of temperature effects and microstructure changes, a revised model for prediction of unsaturated hydraulic conductivity of compacted GMZ01 bentonite was proposed.

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“…It has been reported on GMZ bentonite as a potential material for the construction of engineered barrier in the Chinese program of geological nuclear waste disposal, for its high montmorillonite content, high cation exchange capacity (CEC) and large specific surface etc. Studies on mineralogy and chemical composition, mechanical properties, hydraulic behavior, swelling behavior, thermal conductivity, microstructure and volume change behavior of GMZ bentonite were performed from 1980s [7]. There is requirement for construction of an engineered barrier around the waste containers [8].…”

Section: Introductionmentioning

confidence: 99%

Thermally Modifying Bentonite For Construction Industry

Namdar¹

2011

geomate

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Advances on the knowledge of the buffer/backfill properties of heavily-compacted GMZ bentonite

Cited by 201 publications

References 45 publications

Thermal properties of engineered barriers for a Canadian deep geological repository

Thermal properties of engineered barriers for a Canadian deep geological repository

Investigation on hydraulic properties of compacted GMZ bentonite used as buffer/backfill material

Thermally Modifying Bentonite For Construction Industry

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