Smectite dehydration and stability: Applications to radioactive waste isolation at Yucca Mountain, Nevada

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Description

Montmorillonite-beidellite smectites are present in amounts up to 50% in the rocks directly underlying the potential high-level radioactive waste repository horizon at Yucca Mountain, Nevada. The thermal reactions of concern include reversible collapse/expansion of the smectite layers due to loss/gain of interlayer water;irreversible collapse due to loss of interlayer water and migration of interlayer cations into the 2:1 silicate layers;irreversible reduction of the osmotic swelling ability through reaction in a steam atmosphere;and inhomogeneous transformation of the smectite into an interstratified illite/smectite. Reversible collapse should be of minor importance because any thermally driven collapse will be reversed when water is introduced ... continued below

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32 p.

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Bish, D.L. March 1, 1988.

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Description

Montmorillonite-beidellite smectites are present in amounts up to 50% in the rocks directly underlying the potential high-level radioactive waste repository horizon at Yucca Mountain, Nevada. The thermal reactions of concern include reversible collapse/expansion of the smectite layers due to loss/gain of interlayer water;irreversible collapse due to loss of interlayer water and migration of interlayer cations into the 2:1 silicate layers;irreversible reduction of the osmotic swelling ability through reaction in a steam atmosphere;and inhomogeneous transformation of the smectite into an interstratified illite/smectite. Reversible collapse should be of minor importance because any thermally driven collapse will be reversed when water is introduced and temperatures go down. The amounts of smectite in the potential repository horizon itself are probably insufficient to give rise to rock strength problems due to reversible collapse. The irreversible reduction of somotic selling capacity in a steam environment may be significant in the rocks near the repository horizon. This effect on naturally occurring Na-rich smectites would probably increase permeabilitie shut would also provide for increased cation exchange by the smectite. 60 refs., 9 figs.

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32 p.

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OSTI as DE88007167

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  • Other Information: PBD: Mar 1988

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  • Other: DE88007167
  • Report No.: LA--11023-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/60343 | External Link
  • Office of Scientific & Technical Information Report Number: 60343
  • Archival Resource Key: ark:/67531/metadc697209

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  • March 1, 1988

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 26, 2016, 5:44 p.m.

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Bish, D.L. Smectite dehydration and stability: Applications to radioactive waste isolation at Yucca Mountain, Nevada, report, March 1, 1988; New Mexico. (digital.library.unt.edu/ark:/67531/metadc697209/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.