The hydrothermal stability of cement sealing materials in the potential Yucca Mountain high level nuclear waste repository

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Description

Cementitious materials, together with other materials, are being considered to seal a potential repository at Yucca Mountain. A concern with cementitious materials is the chemical and mineralogic changes that may occur as these materials age while in contact with local ground waters. A combined theoretical and experimental approach was taken to determine the ability to theoretically predict mineralogic changes. The cementitious material selected for study has a relatively low Ca:Si ratio approaching that of the mineral tobermorite. Samples were treated hydrothermally at 200{degrees}C with water similar to that obtained from the J-13 well on the Nevada Test Site. Post-test solutions ... continued below

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7 p.

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Krumhansl, J.L.; Hinkebein, T.E. & Myers, J. November 26, 1991.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Cementitious materials, together with other materials, are being considered to seal a potential repository at Yucca Mountain. A concern with cementitious materials is the chemical and mineralogic changes that may occur as these materials age while in contact with local ground waters. A combined theoretical and experimental approach was taken to determine the ability to theoretically predict mineralogic changes. The cementitious material selected for study has a relatively low Ca:Si ratio approaching that of the mineral tobermorite. Samples were treated hydrothermally at 200{degrees}C with water similar to that obtained from the J-13 well on the Nevada Test Site. Post-test solutions were analyzed for pH as well as dissolved K, Na, Ca, Al, and Si. Solid phases formed during these experiments were characterized by scanning electron microscopy and X- ray diffraction. These findings were compared with predictions made by the geochemical modeling code EQ3NR/E06. It was generally found that there was good agreement between predicted and experimental results.

Physical Description

7 p.

Notes

INIS; OSTI as DE92004480

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  • Annual fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1991

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  • Other: DE92004480
  • Report No.: SAND--91-2685C
  • Report No.: CONF-911202--10
  • Grant Number: AC04-76DP00789
  • Office of Scientific & Technical Information Report Number: 138322
  • Archival Resource Key: ark:/67531/metadc622900

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  • November 26, 1991

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  • June 16, 2015, 7:43 a.m.

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  • April 14, 2016, 9:01 p.m.

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Krumhansl, J.L.; Hinkebein, T.E. & Myers, J. The hydrothermal stability of cement sealing materials in the potential Yucca Mountain high level nuclear waste repository, article, November 26, 1991; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc622900/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.