Hybrid alkaline cements: Bentonite-Opc binders

This article belongs to the Special Issue Geopolymers.

Detalles Bibliográficos
Autores: García-Lodeiro, Inés, Fernández-Jiménez, Ana, Palomo, Ángel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/211581
Acceso en línea:http://hdl.handle.net/10261/211581
Access Level:acceso abierto
Palabra clave:Alkaline activation
Geopolymer
Hybrid cements
Calorimetry
Bentonites
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spelling Hybrid alkaline cements: Bentonite-Opc bindersGarcía-Lodeiro, InésFernández-Jiménez, AnaPalomo, ÁngelAlkaline activationGeopolymerHybrid cementsCalorimetryBentonitesThis article belongs to the Special Issue Geopolymers.Moderately alkaline activators can be used to formulate cementitious binders with a high Supplemetary Cementitious Materials (SCMs) and a low portland cement content (hybrid alkaline cements). This study aimed to prepare hybrid alkaline cements containing large percentages of dehydroxylated bentonite (BT) and small Portland cement (OPC) fractions, with 5% Na2SO4 as a solid alkaline activator. The hydration kinetics of the pastes hydrated in water in the presence and absence of the solid activator were assessed by isothermal conduction calorimetry, whilst the reaction products were characterised with X-Ray Powder Diffraction (XRD) and Fourier-transform Infrared Spectroscopy (FTIR). The presence of the alkaline activator hastened OPC and BT/OPC hydration: more heat of hydration was released, favouring greater initial bentonite reactivity. The portlandite forming during cement hydration reacted readily with the Na2SO4, raising medium alkalinity and enhancing bentonite dissolution and with it reaction product precipitation (primarily (N,C)-A-S-H-like gels that co-exist with C-S-H- or C-A-S-H-like gels). The presence of sulfate ions favoured the formation of AFm-like phases. Preceding aspects accelerated the hydration reactions, with the formation of more reaction product and matrix densification. As a result, the 28 days Na2SO4 activated systems developed greater mechanical strength than the water-hydrated systems, with the 60% BT/40% OPC blends exhibiting higher compressive strength than the 100% OPC pastes.This research was funded by the Spanish Ministry of the Economy and Competitiveness and FEDER under research projects BIA2016-76466-R and RTC2016-4872-S.Peer reviewedMultidisciplinary Digital Publishing InstituteMinisterio de Economía y Competitividad (España)European CommissionFernández-Jiménez, Ana [0000-0002-5721-2923]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202020202018info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/211581reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/BIA2016-76466-Rinfo:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/RTC2016-4872-Shttps://doi.org/10.3390/min8040137Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2115812026-05-22T06:33:51Z
dc.title.none.fl_str_mv Hybrid alkaline cements: Bentonite-Opc binders
title Hybrid alkaline cements: Bentonite-Opc binders
spellingShingle Hybrid alkaline cements: Bentonite-Opc binders
García-Lodeiro, Inés
Alkaline activation
Geopolymer
Hybrid cements
Calorimetry
Bentonites
title_short Hybrid alkaline cements: Bentonite-Opc binders
title_full Hybrid alkaline cements: Bentonite-Opc binders
title_fullStr Hybrid alkaline cements: Bentonite-Opc binders
title_full_unstemmed Hybrid alkaline cements: Bentonite-Opc binders
title_sort Hybrid alkaline cements: Bentonite-Opc binders
dc.creator.none.fl_str_mv García-Lodeiro, Inés
Fernández-Jiménez, Ana
Palomo, Ángel
author García-Lodeiro, Inés
author_facet García-Lodeiro, Inés
Fernández-Jiménez, Ana
Palomo, Ángel
author_role author
author2 Fernández-Jiménez, Ana
Palomo, Ángel
author2_role author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
European Commission
Fernández-Jiménez, Ana [0000-0002-5721-2923]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Alkaline activation
Geopolymer
Hybrid cements
Calorimetry
Bentonites
topic Alkaline activation
Geopolymer
Hybrid cements
Calorimetry
Bentonites
description This article belongs to the Special Issue Geopolymers.
publishDate 2018
dc.date.none.fl_str_mv 2018
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/211581
url http://hdl.handle.net/10261/211581
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/BIA2016-76466-R
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/RTC2016-4872-S
https://doi.org/10.3390/min8040137
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
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
repository.name.fl_str_mv
repository.mail.fl_str_mv
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