Mechanistic Interpretation of Glass Reaction: Input to Kinetic Model Development

by J. K. Bates, Argonne Natl Lab, Argonne, IL, USA,
W. L. Ebert, Argonne Natl Lab, Argonne, IL, USA,
J. P. Bradley, Argonne Natl Lab, Argonne, IL, USA,
W. L. Bourcier, Argonne Natl Lab, Argonne, IL, USA,

Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1991


Actinide-doped SRL 165 type glass was reacted in J-13 groundwater at 90°C for times up to 278 days. The reaction was characterized by both solution and solid analyses. The glass was seen to react nonstoichiometrically with preferred leaching of alkali metals and boron. High resolution electron microscopy revealed the formation of a complex layer structure which became separated from the underlying glass as the reaction progressed. The formation of the layer and its effect on continued glass reaction are discussed with respect to the current model for glass reaction used in the EQ3/6 computer simulation. It is concluded that the layer formed after 278 days is not protective and may eventually become fractured and generate particulates that may be transported by liquid water.

Subject Headings: Computer models | Glass | Kinetics | Groundwater | Alkalinity | Metals (chemical) | Hydraulic fracturing | Radioactive wastes

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