Immobilization of cesium in alkaline activated fly ash matrix

A. Fernandez-Jimenez, Donald E MacPhee, Eric Edward Lachowski, A. Palomo

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67 Citations (Scopus)

Abstract

The 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. (c) 2005 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)185-193
Number of pages8
JournalJournal of Nuclear Materials
Volume346
Issue number2-3
DOIs
Publication statusPublished - Nov 2005

Keywords

  • CEMENTITIOUS MATERIALS
  • PART II
  • GEOPOLYMERS
  • METAKAOLIN
  • CEMENTS
  • WASTES
  • FORMS
  • RINGS

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