Valorisation of rice husk ash as an activator in the preparation of alkali-activated cements based on electric arc furnace slag

Rice husk ash (RHA) was employed as a silica source to produce an alternative sodium silicate solution through the dissolution of varying quantities of RHA in an 8 M NaOH solution. The solution was employed in the production of alkali-activated cements based on electric arc furnace slag (EAFS). Solu...

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Autores: Muñoz-Castillo, Ana, Sánchez-Soto, Pedro José, Eliche-Quesada, D.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/393658
Acceso en línea:http://hdl.handle.net/10261/393658
https://api.elsevier.com/content/abstract/scopus_id/105004193059
Access Level:acceso abierto
Palabra clave:Rice husk ash
Alkali-activated slag
Alternative alkaline activators
Compressive strength
rice husks
slags
strength
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spelling Valorisation of rice husk ash as an activator in the preparation of alkali-activated cements based on electric arc furnace slagMuñoz-Castillo, AnaSánchez-Soto, Pedro JoséEliche-Quesada, D.Rice husk ashAlkali-activated slagAlternative alkaline activatorsCompressive strengthrice husksslagsstrengthRice husk ash (RHA) was employed as a silica source to produce an alternative sodium silicate solution through the dissolution of varying quantities of RHA in an 8 M NaOH solution. The solution was employed in the production of alkali-activated cements based on electric arc furnace slag (EAFS). Solutions were prepared with varying activator modules (Ms, molar ratio SiO₂/Na₂O) of 0.60, 0.85, 1.00, and 1.15. As control samples, slags were activated with 8 M NaOH (Ms = 0.0) and with 8 M NaOH in conjunction with commercial sodium silicate (Ms = 1.0). Mechanical, physical, mineralogical (XRD, FTIR), and microstructural (SEM/EDS) tests were conducted to characterize the obtained pastes. The results of the FTIR and SEM analyses indicated that the SiO₂/Na₂O ratio exerts a significant influence on the reaction products formed. At Ms values higher than 0.85, the predominant reaction product was observed to be a more cross-linked hybrid gel (N,C)-A-S-H. Lower modules resulted in the predominant formation of C-A-S-H gel and a more porous structure with lower mechanical properties. Pastes activated with the alternative RHA solution and Ms = 1.0 exhibited a composition, microstructure, and strength that was similar to or superior to those prepared with conventional commercial activators.This work has been funded by the project PID2020-115161RB-I00: Applying the circular economy in the development of new low carbon footprint alkaline activated hydraulic binders for construction solutions (CongActiva), CIN/AEI/https://doi.org/10.13039/501100011033 FEDER “A way of making Europe”. Authors thank Siderúrgica Balboa company for supplying slags. Technical and human support provided by CICT of Universidad de Jaén (UJA, MINECO, Junta de Andalucía, FEDER) is gratefully acknowledged. Funding for open access publishing: Universidad de Jaén/CBUA.Peer reviewedSpringerAgencia Estatal de Investigación (España)European CommissionSiderúrgica BalboaUniversidad de JaénMinisterio de Economía y Competitividad (España)Junta de AndalucíaMuñoz-Castillo, Ana. [0009-0004-2566-3350]Sánchez-Soto, Pedro José [0000-0002-2901-2975]Eliche-Quesada, D. [0000-0003-3803-9595]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/393658https://api.elsevier.com/content/abstract/scopus_id/105004193059reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-115161RB-I00https://doi.org/10.1007/s43452-025-01209-3Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3936582026-05-22T06:33:51Z
dc.title.none.fl_str_mv Valorisation of rice husk ash as an activator in the preparation of alkali-activated cements based on electric arc furnace slag
title Valorisation of rice husk ash as an activator in the preparation of alkali-activated cements based on electric arc furnace slag
spellingShingle Valorisation of rice husk ash as an activator in the preparation of alkali-activated cements based on electric arc furnace slag
Muñoz-Castillo, Ana
Rice husk ash
Alkali-activated slag
Alternative alkaline activators
Compressive strength
rice husks
slags
strength
title_short Valorisation of rice husk ash as an activator in the preparation of alkali-activated cements based on electric arc furnace slag
title_full Valorisation of rice husk ash as an activator in the preparation of alkali-activated cements based on electric arc furnace slag
title_fullStr Valorisation of rice husk ash as an activator in the preparation of alkali-activated cements based on electric arc furnace slag
title_full_unstemmed Valorisation of rice husk ash as an activator in the preparation of alkali-activated cements based on electric arc furnace slag
title_sort Valorisation of rice husk ash as an activator in the preparation of alkali-activated cements based on electric arc furnace slag
dc.creator.none.fl_str_mv Muñoz-Castillo, Ana
Sánchez-Soto, Pedro José
Eliche-Quesada, D.
author Muñoz-Castillo, Ana
author_facet Muñoz-Castillo, Ana
Sánchez-Soto, Pedro José
Eliche-Quesada, D.
author_role author
author2 Sánchez-Soto, Pedro José
Eliche-Quesada, D.
author2_role author
author
dc.contributor.none.fl_str_mv Agencia Estatal de Investigación (España)
European Commission
Siderúrgica Balboa
Universidad de Jaén
Ministerio de Economía y Competitividad (España)
Junta de Andalucía
Muñoz-Castillo, Ana. [0009-0004-2566-3350]
Sánchez-Soto, Pedro José [0000-0002-2901-2975]
Eliche-Quesada, D. [0000-0003-3803-9595]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Rice husk ash
Alkali-activated slag
Alternative alkaline activators
Compressive strength
rice husks
slags
strength
topic Rice husk ash
Alkali-activated slag
Alternative alkaline activators
Compressive strength
rice husks
slags
strength
description Rice husk ash (RHA) was employed as a silica source to produce an alternative sodium silicate solution through the dissolution of varying quantities of RHA in an 8 M NaOH solution. The solution was employed in the production of alkali-activated cements based on electric arc furnace slag (EAFS). Solutions were prepared with varying activator modules (Ms, molar ratio SiO₂/Na₂O) of 0.60, 0.85, 1.00, and 1.15. As control samples, slags were activated with 8 M NaOH (Ms = 0.0) and with 8 M NaOH in conjunction with commercial sodium silicate (Ms = 1.0). Mechanical, physical, mineralogical (XRD, FTIR), and microstructural (SEM/EDS) tests were conducted to characterize the obtained pastes. The results of the FTIR and SEM analyses indicated that the SiO₂/Na₂O ratio exerts a significant influence on the reaction products formed. At Ms values higher than 0.85, the predominant reaction product was observed to be a more cross-linked hybrid gel (N,C)-A-S-H. Lower modules resulted in the predominant formation of C-A-S-H gel and a more porous structure with lower mechanical properties. Pastes activated with the alternative RHA solution and Ms = 1.0 exhibited a composition, microstructure, and strength that was similar to or superior to those prepared with conventional commercial activators.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
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/10261/393658
https://api.elsevier.com/content/abstract/scopus_id/105004193059
url http://hdl.handle.net/10261/393658
https://api.elsevier.com/content/abstract/scopus_id/105004193059
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-115161RB-I00
https://doi.org/10.1007/s43452-025-01209-3
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
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
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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