Effect of the SiO2/Na2O ratio on the alkali activation of fly ash. Part II: 29Si MAS-NMR Survey

Si MAS-NMR spectroscopy was used to characterize the reaction products resulting from the alkali activation of a type F fly ash. Specifically, analyses focused on the degree of polymerization of the activating solution (SiO2/Na2O ratio = 0.0, 0.19, 0.69 and 1.17) and thermal curing time (from 8 h to...

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Autores: Criado Sanz, María, Fernández-Jiménez, Ana, Palomo, Ángel, Sobrados, Isabel, Sanz, Jesús
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2008
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/19904
Acceso en línea:http://hdl.handle.net/10261/19904
Access Level:acceso abierto
Palabra clave:Fly ash
Si MAS-NMR
Silicate–sodium oxide ratio
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spelling Effect of the SiO2/Na2O ratio on the alkali activation of fly ash. Part II: 29Si MAS-NMR SurveyCriado Sanz, MaríaFernández-Jiménez, AnaPalomo, ÁngelSobrados, IsabelSanz, JesúsFly ashSi MAS-NMRSilicate–sodium oxide ratioSi MAS-NMR spectroscopy was used to characterize the reaction products resulting from the alkali activation of a type F fly ash. Specifically, analyses focused on the degree of polymerization of the activating solution (SiO2/Na2O ratio = 0.0, 0.19, 0.69 and 1.17) and thermal curing time (from 8 h to 180 days at 85 °C). The results obtained showed that the degree of polymerization of the predominant silica species in the activation solutions plays an important role in the kinetics, structure and composition of the gel initially formed. The alkaline aluminosilicate gel formed exhibits short-range order, with the silicon appearing in a wide variety of Q4(nAl) (n = 0, 1, 2, 3 and 4) environments. In the absence of soluble silica (SiO2/Na2O ratio = 0.0, 0.19), the Al-rich gels initially generated evolved rapidly into zeolites. At higher levels of anion polymerization (SiO2/Na2O ratio 0.5), zeolite crystallization was retarded.Funding for this research was provided by the Directorate General of Scientific Research under project BIA2004-04835; a post-doctoral contract associated with the study was awarded by the CSIC and co-financed by the European social fund (REF. I3P-PC2004L).Peer reviewedElsevierEuropean CommissionConsejo Superior de Investigaciones Científicas (España)Ministerio de Ciencia e Innovación (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201020102008info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionapplication/pdf98816 bytesapplication/vnd.ms-excelhttp://hdl.handle.net/10261/19904reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésThe underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1016/j.micromeso.2007.05.062http://dx.doi.org/10.1016/j.micromeso.2007.05.062Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/199042026-05-22T06:33:51Z
dc.title.none.fl_str_mv Effect of the SiO2/Na2O ratio on the alkali activation of fly ash. Part II: 29Si MAS-NMR Survey
title Effect of the SiO2/Na2O ratio on the alkali activation of fly ash. Part II: 29Si MAS-NMR Survey
spellingShingle Effect of the SiO2/Na2O ratio on the alkali activation of fly ash. Part II: 29Si MAS-NMR Survey
Criado Sanz, María
Fly ash
Si MAS-NMR
Silicate–sodium oxide ratio
title_short Effect of the SiO2/Na2O ratio on the alkali activation of fly ash. Part II: 29Si MAS-NMR Survey
title_full Effect of the SiO2/Na2O ratio on the alkali activation of fly ash. Part II: 29Si MAS-NMR Survey
title_fullStr Effect of the SiO2/Na2O ratio on the alkali activation of fly ash. Part II: 29Si MAS-NMR Survey
title_full_unstemmed Effect of the SiO2/Na2O ratio on the alkali activation of fly ash. Part II: 29Si MAS-NMR Survey
title_sort Effect of the SiO2/Na2O ratio on the alkali activation of fly ash. Part II: 29Si MAS-NMR Survey
dc.creator.none.fl_str_mv Criado Sanz, María
Fernández-Jiménez, Ana
Palomo, Ángel
Sobrados, Isabel
Sanz, Jesús
author Criado Sanz, María
author_facet Criado Sanz, María
Fernández-Jiménez, Ana
Palomo, Ángel
Sobrados, Isabel
Sanz, Jesús
author_role author
author2 Fernández-Jiménez, Ana
Palomo, Ángel
Sobrados, Isabel
Sanz, Jesús
author2_role author
author
author
author
dc.contributor.none.fl_str_mv European Commission
Consejo Superior de Investigaciones Científicas (España)
Ministerio de Ciencia e Innovación (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Fly ash
Si MAS-NMR
Silicate–sodium oxide ratio
topic Fly ash
Si MAS-NMR
Silicate–sodium oxide ratio
description Si MAS-NMR spectroscopy was used to characterize the reaction products resulting from the alkali activation of a type F fly ash. Specifically, analyses focused on the degree of polymerization of the activating solution (SiO2/Na2O ratio = 0.0, 0.19, 0.69 and 1.17) and thermal curing time (from 8 h to 180 days at 85 °C). The results obtained showed that the degree of polymerization of the predominant silica species in the activation solutions plays an important role in the kinetics, structure and composition of the gel initially formed. The alkaline aluminosilicate gel formed exhibits short-range order, with the silicon appearing in a wide variety of Q4(nAl) (n = 0, 1, 2, 3 and 4) environments. In the absence of soluble silica (SiO2/Na2O ratio = 0.0, 0.19), the Al-rich gels initially generated evolved rapidly into zeolites. At higher levels of anion polymerization (SiO2/Na2O ratio 0.5), zeolite crystallization was retarded.
publishDate 2008
dc.date.none.fl_str_mv 2008
2010
2010
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/19904
url http://hdl.handle.net/10261/19904
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1016/j.micromeso.2007.05.062
http://dx.doi.org/10.1016/j.micromeso.2007.05.062
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
98816 bytes
application/vnd.ms-excel
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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