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PCT Leach Tests of Hot Isostatically Pressed (HIPped) Zeolitic Concretes

Published online by Cambridge University Press:  03 September 2012

D. D. Siemer
LITCO, P.O. Box 1625, Idaho Falls, ID 83415–3485
Delia M. Roy
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802.
Michael W. Grutzeck
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802.
M. L. D. Gougar
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802.
Barry E. Scheetz
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802.
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The logical place for the US Federal government to site a permanent repository for its massive accumulation of cold-war reprocessing radwaste would be at its primary cold-war nuclear device testing reservation, the Nevada Test Site(1). Regardless of whether it eventually chooses to implement that repository by drilling lateral “drifts” into consolidated rock (e.g. its proposed Yucca Mountain facility) or by augering moderately-deep boreholes into unwelded alluvium beds (e.g. the “Greater Confinement Disposal (GCD) repository implemented at Frenchman Flats in 1984 (2), zeolitic hydroceramic materials would be more stable than would glasses. The thermodynamic rationale for this is that in such regions, soil solutions and soil gasses both tend to “weather” buried natural glasses to zeolitic materials(3). It has also been demonstrated that the same type of phases form when properly designed cementitious “grouts” are cured under mild hydrothermal conditions(4,5) - precisely those conditions assumed by DOE's repository modelers for “failed” (i.e. flooded) repositories and under which radwaste-type glasses rapidly decompose to form crystalline zeolitic phases(6,7).

Research Article
Copyright © Materials Research Society 1997

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