An empirical modeling approach to high sodium glass durability

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:518665

Shine, E P; Sadler, A L.K. ^[1]

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1. Westinghouse Savannah River Company, Aiken, SC (United States)

Empirical mixture models have been developed for chemical durability of high sodium borosilicate glass. The response of boron to a seven-day Product Consistency Test (PCT) was chosen as the measure of durability. The objective of the model development was to support the proposed vitrification of Hanford low-level waste (LLW), the bulk of which is primarily sodium oxide. A full first-order model and a second order model were developed from a database of high-sodium borosilicate glasses. First-order models proved to be satisfactory in a qualitative sense, but root mean squared errors were fairly large for quantitative predictive purposes. The results imply that mechanistic models relating durability to composition should include higher order compositional interactions; a second-order model yielded much improved statistics. The modeling results also suggest that calcium, which is considered a network modifier yet is also regarded as a glass {open_quotes}stiffener{close_quotes}, may improve durability.

• OSTI ID: 518665
• Report Number(s): CONF-9604124--
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
BOROSILICATE GLASS
LOW-LEVEL RADIOACTIVE WASTES
MATHEMATICAL MODELS
SODIUM
STABILITY
VITRIFICATION