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Title

Immobilization of cesium in alkaline activated fly ash matrix

AuthorsFernández-Jiménez, Ana ; Macphee, D. E.; Lachowski, E. E.; Palomo, Ángel
KeywordsAlkaline activated fly ash
AAFA
Cesium
Issue Date15-Nov-2005
PublisherElsevier
CitationJournal of Nuclear Materials 346(2-3): 185-193 (2005)
AbstractThe immobilization potential of alkaline activated fly ash (AAFA) matrices for cesium has been investigated. The presence of Cs in the AAFA pastes, prepared using 8M NaOH solution as activator, showed no significant adverse effects on mechanical strength or microstructure, nor were significant quantities of Cs leached following application of the Toxic Characteristic Leaching Procedure (TCLP) and American Nuclear Society (ANS) 16.1 leaching protocols. Microstructural analysis shows Cs associated with the main reaction product in the AAFA suggesting that cesium is chemically bound rather than physically encapsulated. It is proposed that cesium is incorporated into the alkaline aluminosilicate gel, a precursor for zeolite formation.
Publisher version (URL)http://dx.doi.org/10.1016/j.jnucmat.2005.06.006
URIhttp://hdl.handle.net/10261/32213
DOI10.1016/j.jnucmat.2005.06.006
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