Theory and calculation of water distribution in bentonite in a thermal field

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Highly compacted bentonite is under consideration for use as a buffer material in geological repositories for high-level radioactive wastes. To assess the suitability of bentonite for this use, it is necessary to be able to predict the rate and spatial extent of water uptake and water distribution in highly compacted bentonite in the presence of thermal gradients. The ''Buffer Mass Test'' (BMT) was conducted by workers in Sweden as part of the Stripa Project. The BMT measured uptake and spatial distributions of water infiltrating annuli of compacted MX-80 sodium bentonite heated from within and surrounded by granite rock; the measurements … continued below

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10 pages

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Carnahan, C.L. September 1, 1988.

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Highly compacted bentonite is under consideration for use as a buffer material in geological repositories for high-level radioactive wastes. To assess the suitability of bentonite for this use, it is necessary to be able to predict the rate and spatial extent of water uptake and water distribution in highly compacted bentonite in the presence of thermal gradients. The ''Buffer Mass Test'' (BMT) was conducted by workers in Sweden as part of the Stripa Project. The BMT measured uptake and spatial distributions of water infiltrating annuli of compacted MX-80 sodium bentonite heated from within and surrounded by granite rock; the measurements provided a body of data very valuable for comparison to results of theoretical calculations. Results of experiments on adsorption of water by highly compacted MX-80 bentonite have been reported by workers in Switzerland. The experiments included measurements of heats of immersion and adsorption-desorption isotherms. These measurements provide the basis for prediction of water vapor pressures in equilibrium with bentonite having specified adsorbed water contents at various temperatures. The present work offers a phenomenological description of the processes influencing movement of water in compacted bentonite in the presence of a variable thermal field. The theory is applied to the bentonite buffer-water system in an assumed steady state of heat and mass transport, using critical data derived from the experimental work done in Switzerland. Results of the theory are compared to distributions of absorbed water in buffers observed in the Swedish BMT experiments. 9 refs., 2 figs.

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10 pages

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NTIS, PC A02/MF A01 - OSTI; 1.

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  • 12. international symposium on the scientific basis for nuclear waste management, Berlin, F.R. Germany, 10 Oct 1988

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  • Other: DE89007131
  • Report No.: LBL-26058
  • Report No.: CONF-881066-5
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 6528533
  • Archival Resource Key: ark:/67531/metadc1203788

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Office of Scientific & Technical Information Technical Reports

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  • September 1, 1988

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  • July 5, 2018, 11:11 p.m.

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  • June 12, 2019, 1:51 p.m.

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Carnahan, C.L. Theory and calculation of water distribution in bentonite in a thermal field, article, September 1, 1988; California. (https://digital.library.unt.edu/ark:/67531/metadc1203788/: accessed May 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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