Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime system

One inconvenience presented by the thermal activation of kaolinite-based wastes is their low content of metakaolinite, a highly pozzolanic product listed in current standards for the manufacture of commercial cements. The addition of a chemical activator during the thermal activation process is a pr...

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Autores: García Giménez, Rosario, Vigil de la Villa, Raquel, Martínez Ramírez, Sagrario, Fernández Carrasco, Lucía|||0000-0002-2379-3782, Frias Rojas, Moisés
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/115920
Acceso en línea:https://hdl.handle.net/2117/115920
https://dx.doi.org/10.1016/j.clay.2018.02.007
Access Level:acceso abierto
Palabra clave:Cement--Additives
Coal waste
Cement
Thermal and chemical activation
Hydrated phases
Stratlingite
LDH
Amorphous materials
C-S-H gels
Ciment -- Additius
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials ceràmics
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spelling Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime systemGarcía Giménez, RosarioVigil de la Villa, RaquelMartínez Ramírez, SagrarioFernández Carrasco, Lucía|||0000-0002-2379-3782Frias Rojas, MoisésCement--AdditivesCoal wasteCementCementThermal and chemical activationHydrated phasesStratlingiteLDHAmorphous materialsC-S-H gelsCiment -- AdditiusÀrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigóÀrees temàtiques de la UPC::Enginyeria dels materials::Materials ceràmicsOne inconvenience presented by the thermal activation of kaolinite-based wastes is their low content of metakaolinite, a highly pozzolanic product listed in current standards for the manufacture of commercial cements. The addition of a chemical activator during the thermal activation process is a priority line of research to increase the reactivity of the recycled metakaolinite. In this paper, an additional chemical activator, ZnO, is studied and its effect on both pozzolanic properties and the evolution of mineralogical phases in the thermal activation of coal waste with a reaction time of up to 90¿days in the pozzolan/lime system. To do so, activation temperatures of between 550¿°C/650¿°C were selected and additions of chemical activator (ZnO) in percentages of between 0.0% and 3.0% by weight of coal waste, because it is an activator with a positive effect on a 100% natural kaolinite. The results showed that the incorporation of ZnO inhibited the reactivity of the recycled metakaolinite and in consequence, the capacity of the metakaolinite to react with the surrounding lime; even more so when the content of added chemical activator was raised, albeit with some exceptions, in the samples activated at 550¿°C and 650¿°C with 0.5% of chemical activator. In none of the cases under analysis was the chemical activator able to improve the properties of the metakaolinite in comparison with the properties of the reference sample activated only with temperature. The hydrated phases that appeared in the pozzolanic reaction were tetracalcium aluminate hydrate, stratlingite, monosulfoaluminate hydrate and LDH (phyllosilicate/carbonate).Peer Reviewed20182018-05-0120182018-04-04journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/115920https://dx.doi.org/10.1016/j.clay.2018.02.007reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1159202026-05-27T15:37:01Z
dc.title.none.fl_str_mv Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime system
title Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime system
spellingShingle Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime system
García Giménez, Rosario
Cement--Additives
Coal waste
Cement
Cement
Thermal and chemical activation
Hydrated phases
Stratlingite
LDH
Amorphous materials
C-S-H gels
Ciment -- Additius
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials ceràmics
title_short Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime system
title_full Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime system
title_fullStr Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime system
title_full_unstemmed Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime system
title_sort Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime system
dc.creator.none.fl_str_mv García Giménez, Rosario
Vigil de la Villa, Raquel
Martínez Ramírez, Sagrario
Fernández Carrasco, Lucía|||0000-0002-2379-3782
Frias Rojas, Moisés
author García Giménez, Rosario
author_facet García Giménez, Rosario
Vigil de la Villa, Raquel
Martínez Ramírez, Sagrario
Fernández Carrasco, Lucía|||0000-0002-2379-3782
Frias Rojas, Moisés
author_role author
author2 Vigil de la Villa, Raquel
Martínez Ramírez, Sagrario
Fernández Carrasco, Lucía|||0000-0002-2379-3782
Frias Rojas, Moisés
author2_role author
author
author
author
dc.subject.none.fl_str_mv Cement--Additives
Coal waste
Cement
Cement
Thermal and chemical activation
Hydrated phases
Stratlingite
LDH
Amorphous materials
C-S-H gels
Ciment -- Additius
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials ceràmics
topic Cement--Additives
Coal waste
Cement
Cement
Thermal and chemical activation
Hydrated phases
Stratlingite
LDH
Amorphous materials
C-S-H gels
Ciment -- Additius
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials ceràmics
description One inconvenience presented by the thermal activation of kaolinite-based wastes is their low content of metakaolinite, a highly pozzolanic product listed in current standards for the manufacture of commercial cements. The addition of a chemical activator during the thermal activation process is a priority line of research to increase the reactivity of the recycled metakaolinite. In this paper, an additional chemical activator, ZnO, is studied and its effect on both pozzolanic properties and the evolution of mineralogical phases in the thermal activation of coal waste with a reaction time of up to 90¿days in the pozzolan/lime system. To do so, activation temperatures of between 550¿°C/650¿°C were selected and additions of chemical activator (ZnO) in percentages of between 0.0% and 3.0% by weight of coal waste, because it is an activator with a positive effect on a 100% natural kaolinite. The results showed that the incorporation of ZnO inhibited the reactivity of the recycled metakaolinite and in consequence, the capacity of the metakaolinite to react with the surrounding lime; even more so when the content of added chemical activator was raised, albeit with some exceptions, in the samples activated at 550¿°C and 650¿°C with 0.5% of chemical activator. In none of the cases under analysis was the chemical activator able to improve the properties of the metakaolinite in comparison with the properties of the reference sample activated only with temperature. The hydrated phases that appeared in the pozzolanic reaction were tetracalcium aluminate hydrate, stratlingite, monosulfoaluminate hydrate and LDH (phyllosilicate/carbonate).
publishDate 2018
dc.date.none.fl_str_mv 2018
2018-05-01
2018
2018-04-04
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/115920
https://dx.doi.org/10.1016/j.clay.2018.02.007
url https://hdl.handle.net/2117/115920
https://dx.doi.org/10.1016/j.clay.2018.02.007
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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