Microstructural characterisation of alkali-activated PFA matrices for waste immobilisation

Ana Maria Fernandez; Eric E Lachowski; A. Palomo; Donald E MacPhee

doi:10.1016/j.cemconcomp.2004.02.034

Microstructural characterisation of alkali-activated PFA matrices for waste immobilisation

Ana Maria Fernandez, Eric E Lachowski, A. Palomo, Donald E MacPhee

Chemistry

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55 Citations (Scopus)

Abstract

A variety of natural and industrial waste product materials rich in SiO2 and Al2O3 may be activated with alkalis to produce cementitious systems which when cured under mild temperature conditions, set and harden to give a very compact paste. When fly ash is the activated material, fast setting and rapid strength development have been reported. In addition to their application in construction, they may have a role in the immobilisation of toxic waste.

Alkali-activated fly ash matrices containing arsenic were studied by a combination of scanning and transmission electron microscopy along with energy-dispersive X-ray analysis of argon-milled sections. Little arsenic was incorporated in the matrix of hydration product but it was apparently associated with iron derived from the hydration of the fly ash. There was no association of As with added Fe2O3. (C) 2004 Elsever Ltd. All rights reserved.

Original language	English
Pages (from-to)	1001-1006
Number of pages	5
Journal	Cement & Concrete Composites
Volume	26
Issue number	8
DOIs	https://doi.org/10.1016/j.cemconcomp.2004.02.034
Publication status	Published - Nov 2004

Keywords

geopolymer
alkali-activated fly ash
arsenic immobilisation

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title = "Microstructural characterisation of alkali-activated PFA matrices for waste immobilisation",

abstract = "A variety of natural and industrial waste product materials rich in SiO2 and Al2O3 may be activated with alkalis to produce cementitious systems which when cured under mild temperature conditions, set and harden to give a very compact paste. When fly ash is the activated material, fast setting and rapid strength development have been reported. In addition to their application in construction, they may have a role in the immobilisation of toxic waste.Alkali-activated fly ash matrices containing arsenic were studied by a combination of scanning and transmission electron microscopy along with energy-dispersive X-ray analysis of argon-milled sections. Little arsenic was incorporated in the matrix of hydration product but it was apparently associated with iron derived from the hydration of the fly ash. There was no association of As with added Fe2O3. (C) 2004 Elsever Ltd. All rights reserved.",

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author = "Fernandez, {Ana Maria} and Lachowski, {Eric E} and A. Palomo and MacPhee, {Donald E}",

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TY - JOUR

T1 - Microstructural characterisation of alkali-activated PFA matrices for waste immobilisation

AU - Fernandez, Ana Maria

AU - Lachowski, Eric E

AU - Palomo, A.

AU - MacPhee, Donald E

PY - 2004/11

Y1 - 2004/11

N2 - A variety of natural and industrial waste product materials rich in SiO2 and Al2O3 may be activated with alkalis to produce cementitious systems which when cured under mild temperature conditions, set and harden to give a very compact paste. When fly ash is the activated material, fast setting and rapid strength development have been reported. In addition to their application in construction, they may have a role in the immobilisation of toxic waste.Alkali-activated fly ash matrices containing arsenic were studied by a combination of scanning and transmission electron microscopy along with energy-dispersive X-ray analysis of argon-milled sections. Little arsenic was incorporated in the matrix of hydration product but it was apparently associated with iron derived from the hydration of the fly ash. There was no association of As with added Fe2O3. (C) 2004 Elsever Ltd. All rights reserved.

AB - A variety of natural and industrial waste product materials rich in SiO2 and Al2O3 may be activated with alkalis to produce cementitious systems which when cured under mild temperature conditions, set and harden to give a very compact paste. When fly ash is the activated material, fast setting and rapid strength development have been reported. In addition to their application in construction, they may have a role in the immobilisation of toxic waste.Alkali-activated fly ash matrices containing arsenic were studied by a combination of scanning and transmission electron microscopy along with energy-dispersive X-ray analysis of argon-milled sections. Little arsenic was incorporated in the matrix of hydration product but it was apparently associated with iron derived from the hydration of the fly ash. There was no association of As with added Fe2O3. (C) 2004 Elsever Ltd. All rights reserved.

KW - geopolymer

KW - alkali-activated fly ash

KW - arsenic immobilisation

U2 - 10.1016/j.cemconcomp.2004.02.034

DO - 10.1016/j.cemconcomp.2004.02.034

M3 - Article

SN - 0958-9465

VL - 26

SP - 1001

EP - 1006

JO - Cement & Concrete Composites

JF - Cement & Concrete Composites

IS - 8

ER -

Microstructural characterisation of alkali-activated PFA matrices for waste immobilisation

Abstract

Keywords

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