The long-term alteration of borosilicate waste glasses

Conference · Tue Jun 01 04:00:00 EDT 1993

OSTI ID:10162255

Ebert, W L; Bates, J K; Bradley, C R; Buck, E C; Dietz, N L; Brown, N R

Prediction of the long-term durability of glass waste forms under potential disposal conditions is based on a mechanistic model of glass corrosion which has been derived from short-term laboratory tests. The model of glass reaction that has evolved identifies the hydrolysis of an Si-0 bond to release silicic acid as the step which controls the long-term glass reactivity. This reaction step is initially fast under dilute solution conditions, but slows as the silicic acid concentration in solution increases. An increase in the solution concentrations of glass components will occur with progressive glass corrosion, and so the solutions which contact waste glasses over long reaction times will have high concentrations of glass components. Therefore, the glass reactivity is usually expected to decrease with the reaction progress as the contacting solution becomes more concentrated. The corrosion behavior of glasses contacted by highly concentrated solutions must be characterized to assess the long-term glass stability.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10162255
• Report Number(s): ANL/CMT/CP--79597; CONF-930438--22; ON: DE93015161
• Country of Publication: United States
• Language: English

Related Subjects

052001
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
360602
360604
ANL
BOROSILICATE GLASS
CORROSION
CORROSION, EROSION, AND DEGRADATION
HIGH-LEVEL RADIOACTIVE WASTES
LEACHING
SAVANNAH RIVER PLANT
STRUCTURE AND PHASE STUDIES
VITRIFICATION
WASTE PROCESSING
X-RAY SPECTROSCOPY