These time-temperature-transformation (TTT) test methods evaluate the type and amount of devitrification in heat treated or canistered nuclear or mixed waste glass. Test Method A describes the methods by which qualitative TTT diagrams that delineate crystallizing phase regions can be determined for heat treated or canistered nuclear, mixed, or hazardous waste glasses. Test Method B describes the methods by which quantitative TTT diagrams can be determined for nuclear, mixed, or hazardous waste glasses. The quantitative TTT diagrams delineate crystallizing phase regions by determination of the volume or weight percent crystallinity. The quantitative TTT diagrams and the associated kinetic analysis developed using Test Method B can specifically be used to evaluate the degree to which a glass will crystallize when subjected to varying time-temperature conditions.
To standardize the manner in which crystallization in HLW is evaluated for eventual geologic storage of HLW glass. It has already been adoped at SRS and West Valley and will need to be perfomed int he same manner for Hanford HLW glass.
Keywordsdevitrification; time-temperature-transformation; mixed waste glass
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development