Use of biomass fly ash for mitigation of alkali-silica reaction of cement mortars

Detalhes bibliográficos
Autor(a) principal: Esteves, T.
Data de Publicação: 2012
Outros Autores: Rejini, R., Soares, D., Santos Silva, A., Ferreira, V., Labrincha, J. A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1003298
Resumo: The degradation of large concrete structures over time is well known. One of the main reasons is the reaction that occurs between the cement paste and some reactive siliceous aggregates, which causes a significant expansion that depends on the employed materials and exposure conditions of the structure. This process is known as alkali-silica reaction (ASR) and affects several structures worldwide, including major dams and bridges in long time run. In this work the effect of fly ashes from biomass combustion in the mitigation of the ASR was investigated. The fly ashes were collected from two industrial plants located in the central area of Portugal: (i) a thermal power plant (BFA1), (ii) co-generation process of a pulp and paper industry (BFA2). The fly ashes were characterized by different techniques to determine the following properties: particle size distribution (laser interference), loss on ignition and thermal behaviour (TG/DTA), chemical (XRF) and phases (XRD) composition and pozzolanic activity (EN 196-5:2005). These biomass fly ashes were irregular in shape and fine in size. The chemical characterization revealed significant differences in CaO and SiO2 contents, but both fly ashes can be considered as class C fly ashes if compared with those generated from the coal combustion. Accelerated mortar-bar tests were conducted according to ASTM C1260/ASTM C1567 to evaluate the behaviour of the biomass fly ash in the ASR inhibition mechanism. The expansive behaviour was studied on mortars where the cement was partially replaced (20–30 wt%) by the biomass fly ashes. This substitution tends to reduce the expansion upon accelerated curing conditions, and BFA2 is more effective than BFA1. But the incorporation of biomass fly ash in the blend along with metakaolin (MK), 20% BFA + 10% MK did a significant improvement in the expansion results, indicating the effective use of biomass fly ash along with metakaolin in mitigating the ASR.
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spelling Use of biomass fly ash for mitigation of alkali-silica reaction of cement mortarsAlkali-silica reactionMitigationBiomass fly ashMetakaolinMortarsThe degradation of large concrete structures over time is well known. One of the main reasons is the reaction that occurs between the cement paste and some reactive siliceous aggregates, which causes a significant expansion that depends on the employed materials and exposure conditions of the structure. This process is known as alkali-silica reaction (ASR) and affects several structures worldwide, including major dams and bridges in long time run. In this work the effect of fly ashes from biomass combustion in the mitigation of the ASR was investigated. The fly ashes were collected from two industrial plants located in the central area of Portugal: (i) a thermal power plant (BFA1), (ii) co-generation process of a pulp and paper industry (BFA2). The fly ashes were characterized by different techniques to determine the following properties: particle size distribution (laser interference), loss on ignition and thermal behaviour (TG/DTA), chemical (XRF) and phases (XRD) composition and pozzolanic activity (EN 196-5:2005). These biomass fly ashes were irregular in shape and fine in size. The chemical characterization revealed significant differences in CaO and SiO2 contents, but both fly ashes can be considered as class C fly ashes if compared with those generated from the coal combustion. Accelerated mortar-bar tests were conducted according to ASTM C1260/ASTM C1567 to evaluate the behaviour of the biomass fly ash in the ASR inhibition mechanism. The expansive behaviour was studied on mortars where the cement was partially replaced (20–30 wt%) by the biomass fly ashes. This substitution tends to reduce the expansion upon accelerated curing conditions, and BFA2 is more effective than BFA1. But the incorporation of biomass fly ash in the blend along with metakaolin (MK), 20% BFA + 10% MK did a significant improvement in the expansion results, indicating the effective use of biomass fly ash along with metakaolin in mitigating the ASR.Elsevier2012-03-30T15:11:53Z2014-10-20T16:32:31Z2017-04-13T11:54:47Z2012-01-01T00:00:00Z2012-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://repositorio.lnec.pt:8080/jspui/handle/123456789/1003298engEsteves, T.Rejini, R.Soares, D.Santos Silva, A.Ferreira, V.Labrincha, J. A.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-13T03:06:41Zoai:localhost:123456789/1003298Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:40:04.541833Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Use of biomass fly ash for mitigation of alkali-silica reaction of cement mortars
title Use of biomass fly ash for mitigation of alkali-silica reaction of cement mortars
spellingShingle Use of biomass fly ash for mitigation of alkali-silica reaction of cement mortars
Esteves, T.
Alkali-silica reaction
Mitigation
Biomass fly ash
Metakaolin
Mortars
title_short Use of biomass fly ash for mitigation of alkali-silica reaction of cement mortars
title_full Use of biomass fly ash for mitigation of alkali-silica reaction of cement mortars
title_fullStr Use of biomass fly ash for mitigation of alkali-silica reaction of cement mortars
title_full_unstemmed Use of biomass fly ash for mitigation of alkali-silica reaction of cement mortars
title_sort Use of biomass fly ash for mitigation of alkali-silica reaction of cement mortars
author Esteves, T.
author_facet Esteves, T.
Rejini, R.
Soares, D.
Santos Silva, A.
Ferreira, V.
Labrincha, J. A.
author_role author
author2 Rejini, R.
Soares, D.
Santos Silva, A.
Ferreira, V.
Labrincha, J. A.
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Esteves, T.
Rejini, R.
Soares, D.
Santos Silva, A.
Ferreira, V.
Labrincha, J. A.
dc.subject.por.fl_str_mv Alkali-silica reaction
Mitigation
Biomass fly ash
Metakaolin
Mortars
topic Alkali-silica reaction
Mitigation
Biomass fly ash
Metakaolin
Mortars
description The degradation of large concrete structures over time is well known. One of the main reasons is the reaction that occurs between the cement paste and some reactive siliceous aggregates, which causes a significant expansion that depends on the employed materials and exposure conditions of the structure. This process is known as alkali-silica reaction (ASR) and affects several structures worldwide, including major dams and bridges in long time run. In this work the effect of fly ashes from biomass combustion in the mitigation of the ASR was investigated. The fly ashes were collected from two industrial plants located in the central area of Portugal: (i) a thermal power plant (BFA1), (ii) co-generation process of a pulp and paper industry (BFA2). The fly ashes were characterized by different techniques to determine the following properties: particle size distribution (laser interference), loss on ignition and thermal behaviour (TG/DTA), chemical (XRF) and phases (XRD) composition and pozzolanic activity (EN 196-5:2005). These biomass fly ashes were irregular in shape and fine in size. The chemical characterization revealed significant differences in CaO and SiO2 contents, but both fly ashes can be considered as class C fly ashes if compared with those generated from the coal combustion. Accelerated mortar-bar tests were conducted according to ASTM C1260/ASTM C1567 to evaluate the behaviour of the biomass fly ash in the ASR inhibition mechanism. The expansive behaviour was studied on mortars where the cement was partially replaced (20–30 wt%) by the biomass fly ashes. This substitution tends to reduce the expansion upon accelerated curing conditions, and BFA2 is more effective than BFA1. But the incorporation of biomass fly ash in the blend along with metakaolin (MK), 20% BFA + 10% MK did a significant improvement in the expansion results, indicating the effective use of biomass fly ash along with metakaolin in mitigating the ASR.
publishDate 2012
dc.date.none.fl_str_mv 2012-03-30T15:11:53Z
2012-01-01T00:00:00Z
2012-01
2014-10-20T16:32:31Z
2017-04-13T11:54:47Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://repositorio.lnec.pt:8080/jspui/handle/123456789/1003298
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language eng
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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