Flue gas desulfurization (FGD) fly ash as a sustainable, safe alternative for cement-based materials

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dc.contributor.authorNavarrete, Ivan
dc.contributor.authorVargas, Felipe
dc.contributor.authorMartinez, Patricia
dc.contributor.authorPaul, Alvaro
dc.contributor.authorLopez, Mauricio
dc.date.accessioned2022-11-30T02:46:41Z
dc.date.available2022-11-30T02:46:41Z
dc.date.issued2021
dc.description.abstractThe reduction in fly ash production in coal-fired power plants has created an opportunity to explore alternative types of fly ashes previously deemed unfit for use in concrete. In plants using flue gas desulfurization (FGD) processes, fly ash could contain high amounts of sulfur oxides, making its use in concrete inadvisable. However, the type of sulfur compound present in a fly ash strongly impacts its performance in concrete. In this study, two types of fly ash were used to evaluate the effect of sulfur oxides on mortar mixtures incorporating fly ash as supplementary cementitious material (SCM); one from an FGD unit, with high sulfur oxide content (in the form of hannebachite), and the other generated in a system without FGD, with negligible sulfur oxide. Calorimetry results show that hannebachite can effectively control C3A hydration similar to gypsum; however, its presence in FGD fly ash does not induce deleterious expansion associated with internal sulfate attack in mortars. TGA and XRD analyses suggest that hannebachite has lower reactivity than sulfate. Hannebachite not only maintains the pozzolanic reactivity of the fly ash, but its fineness may promote OPC hydration, increasing compressive strength. The results of this study indicate that FGD fly ash can be used as an SCM, allowing more sustainable concrete production.en_ES
dc.facultadFacultad de Ingenieríaen_ES
dc.file.nameNavarrete_Flu2021.pdf
dc.identifier.doihttps://doi.org/10.1016/j.jclepro.2020.124646
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/7463
dc.languageen
dc.publisherElsevier
dc.sourceJournal of Cleaner Production
dc.subjectDURABILITYen_ES
dc.subjectCONCRETEen_ES
dc.subjectINTERNAL SULFATE ATTACKen_ES
dc.subjectHANNEBACHITEen_ES
dc.subjectGYPSUMen_ES
dc.subjectETTRINGITEen_ES
dc.titleFlue gas desulfurization (FGD) fly ash as a sustainable, safe alternative for cement-based materials
dc.typeArticulo
uv.departamentoEscuela de Ingenieria en Construccion
uv.notageneralNo disponible para descarga

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