Immobilization of cesium in alkaline activated fly ash matrix

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

doi:10.1016/j.jnucmat.2005.06.006

Immobilization of cesium in alkaline activated fly ash matrix

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

Chemistry

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89 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 language	English
Pages (from-to)	185-193
Number of pages	8
Journal	Journal of Nuclear Materials
Volume	346
Issue number	2-3
DOIs	https://doi.org/10.1016/j.jnucmat.2005.06.006
Publication status	Published - Nov 2005

Keywords

CEMENTITIOUS MATERIALS
PART II
GEOPOLYMERS
METAKAOLIN
CEMENTS
WASTES
FORMS
RINGS

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title = "Immobilization of cesium in alkaline activated fly ash matrix",

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.",

keywords = "CEMENTITIOUS MATERIALS, PART II, GEOPOLYMERS, METAKAOLIN, CEMENTS, WASTES, FORMS, RINGS",

author = "A. Fernandez-Jimenez and MacPhee, {Donald E} and Lachowski, {Eric Edward} and A. Palomo",

year = "2005",

month = nov,

doi = "10.1016/j.jnucmat.2005.06.006",

language = "English",

volume = "346",

pages = "185--193",

journal = "Journal of Nuclear Materials",

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publisher = "Elsevier",

number = "2-3",

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TY - JOUR

T1 - Immobilization of cesium in alkaline activated fly ash matrix

AU - Fernandez-Jimenez, A.

AU - MacPhee, Donald E

AU - Lachowski, Eric Edward

AU - Palomo, A.

PY - 2005/11

Y1 - 2005/11

N2 - 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.

AB - 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.

KW - CEMENTITIOUS MATERIALS

KW - PART II

KW - GEOPOLYMERS

KW - METAKAOLIN

KW - CEMENTS

KW - WASTES

KW - FORMS

KW - RINGS

U2 - 10.1016/j.jnucmat.2005.06.006

DO - 10.1016/j.jnucmat.2005.06.006

M3 - Article

SN - 0022-3115

VL - 346

SP - 185

EP - 193

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 2-3

ER -

Immobilization of cesium in alkaline activated fly ash matrix

Abstract

Keywords

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