Influence of chemical admixtures on expansive behavior and mechanical properties of K-type self-stressing concrete in CFST systems

Concrete-filled steel tubes (CFSTs) have attracted increasing interest in research during the last decade as a construction system that increases its performance due to the use of self-stressing concrete. The efficiency and confining pressure of this construction solution mainly depends on the expan...

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Autores: Carballosa, Pedro, García Calvo, José Luis, Fernández-Escandón González, Alfredo
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/375982
Acceso en línea:http://hdl.handle.net/10261/375982
Access Level:acceso abierto
Palabra clave:Chemical admixtures
Concrete-filled steel tube (CFST)
Mechanical properties
Restrained expansion
Self-stressing concrete
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spelling Influence of chemical admixtures on expansive behavior and mechanical properties of K-type self-stressing concrete in CFST systemsCarballosa, PedroGarcía Calvo, José LuisFernández-Escandón González, AlfredoChemical admixturesConcrete-filled steel tube (CFST)Mechanical propertiesRestrained expansionSelf-stressing concreteConcrete-filled steel tubes (CFSTs) have attracted increasing interest in research during the last decade as a construction system that increases its performance due to the use of self-stressing concrete. The efficiency and confining pressure of this construction solution mainly depends on the expansion of the concrete mixture introduced into the steel tube. This study shows the importance of the correct design of the expansive mixes and the correct selection of components. The effect of three types of chemical admixtures (air-entrained, setting retarder, and hardening accelerator) commonly used in the ready-mixed concrete industry when added to a self-stressing concrete made with a K-type calcium sulfoaluminate–based expansion agent has been analyzed. This study showed that certain chemical admixtures, added in a fixed proportion, conditioned both the compressive strength and the magnitude and kinetics of the expansion in a restricted regime of the reference self-stressing concrete mix. The efficiency of the CFST and self-stressing concrete construction solution represented by the bond failure strength and the sliding load of the concrete core against the steel tube was influenced not by the compressive strength of the expansive concrete but by the degree of restrained expansion (confinement effect) achieved. In this research, an alternative test method for measuring expansion was proposed, which allows continuous recording of positive strains (expansions), eliminating the dependence on setting time for demolding; this method even allows the exact identification of the expansion beginning. Finally, it was proposed that the ettringite detectable by the X-ray diffraction (XRD) technique was not representative of the magnitude of expansion generated from K-type calcium sulfoaluminate expansive agents because the proportion of ettringite was not related to the expansion determined by the different test methods proposed.The authors would like to thank Juan Carlos Porras from Institute for Construction Sciences Eduardo Torroja\u2014Spanish National Research Council (IETcc-CSIC) for his collaboration in this work. The authors gratefully acknowledge the Spanish Ministry of Science and Innovation for the financial support given to carry out this research as part of Project PID2020-113223RB-I00. They would similarly like to express their gratitude to Cementos Portland Valderribas and IMCD for supplying the cement and expansive agents used in this study.Peer reviewedAmerican Society of Civil EngineersCementos Portland ValderribasConsejo Superior de Investigaciones Científicas (España)Ministerio de Ciencia e Innovación (España)Carballosa, Pedro [0000-0002-3717-7614]García Calvo, José Luis [0000-0002-0042-9822]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2025202520242025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/375982reponame: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/PID2020-113223RB-I00http://doi.org/10.1061/JMCEE7.MTENG-18220Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3759822026-05-22T06:33:51Z
dc.title.none.fl_str_mv Influence of chemical admixtures on expansive behavior and mechanical properties of K-type self-stressing concrete in CFST systems
title Influence of chemical admixtures on expansive behavior and mechanical properties of K-type self-stressing concrete in CFST systems
spellingShingle Influence of chemical admixtures on expansive behavior and mechanical properties of K-type self-stressing concrete in CFST systems
Carballosa, Pedro
Chemical admixtures
Concrete-filled steel tube (CFST)
Mechanical properties
Restrained expansion
Self-stressing concrete
title_short Influence of chemical admixtures on expansive behavior and mechanical properties of K-type self-stressing concrete in CFST systems
title_full Influence of chemical admixtures on expansive behavior and mechanical properties of K-type self-stressing concrete in CFST systems
title_fullStr Influence of chemical admixtures on expansive behavior and mechanical properties of K-type self-stressing concrete in CFST systems
title_full_unstemmed Influence of chemical admixtures on expansive behavior and mechanical properties of K-type self-stressing concrete in CFST systems
title_sort Influence of chemical admixtures on expansive behavior and mechanical properties of K-type self-stressing concrete in CFST systems
dc.creator.none.fl_str_mv Carballosa, Pedro
García Calvo, José Luis
Fernández-Escandón González, Alfredo
author Carballosa, Pedro
author_facet Carballosa, Pedro
García Calvo, José Luis
Fernández-Escandón González, Alfredo
author_role author
author2 García Calvo, José Luis
Fernández-Escandón González, Alfredo
author2_role author
author
dc.contributor.none.fl_str_mv Cementos Portland Valderribas
Consejo Superior de Investigaciones Científicas (España)
Ministerio de Ciencia e Innovación (España)
Carballosa, Pedro [0000-0002-3717-7614]
García Calvo, José Luis [0000-0002-0042-9822]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Chemical admixtures
Concrete-filled steel tube (CFST)
Mechanical properties
Restrained expansion
Self-stressing concrete
topic Chemical admixtures
Concrete-filled steel tube (CFST)
Mechanical properties
Restrained expansion
Self-stressing concrete
description Concrete-filled steel tubes (CFSTs) have attracted increasing interest in research during the last decade as a construction system that increases its performance due to the use of self-stressing concrete. The efficiency and confining pressure of this construction solution mainly depends on the expansion of the concrete mixture introduced into the steel tube. This study shows the importance of the correct design of the expansive mixes and the correct selection of components. The effect of three types of chemical admixtures (air-entrained, setting retarder, and hardening accelerator) commonly used in the ready-mixed concrete industry when added to a self-stressing concrete made with a K-type calcium sulfoaluminate–based expansion agent has been analyzed. This study showed that certain chemical admixtures, added in a fixed proportion, conditioned both the compressive strength and the magnitude and kinetics of the expansion in a restricted regime of the reference self-stressing concrete mix. The efficiency of the CFST and self-stressing concrete construction solution represented by the bond failure strength and the sliding load of the concrete core against the steel tube was influenced not by the compressive strength of the expansive concrete but by the degree of restrained expansion (confinement effect) achieved. In this research, an alternative test method for measuring expansion was proposed, which allows continuous recording of positive strains (expansions), eliminating the dependence on setting time for demolding; this method even allows the exact identification of the expansion beginning. Finally, it was proposed that the ettringite detectable by the X-ray diffraction (XRD) technique was not representative of the magnitude of expansion generated from K-type calcium sulfoaluminate expansive agents because the proportion of ettringite was not related to the expansion determined by the different test methods proposed.
publishDate 2024
dc.date.none.fl_str_mv 2024
2025
2025
2025
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/10261/375982
url http://hdl.handle.net/10261/375982
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/PID2020-113223RB-I00
http://doi.org/10.1061/JMCEE7.MTENG-18220
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Society of Civil Engineers
publisher.none.fl_str_mv American Society of Civil Engineers
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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