Copper entrapment and immobilization during cement hydration in concrete mixtures containing copper tailings

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dc.contributor.authorVargas, Felipe
dc.contributor.authorAlsina, Marco A.
dc.contributor.authorGaillard, Jean-François
dc.contributor.authorPasten Gonzalez, Pablo Arturo
dc.contributor.authorLópez, Mauricio
dc.date.accessioned2022-11-25T15:41:56Z
dc.date.available2022-11-25T15:41:56Z
dc.date.issued2021
dc.description.abstractThe use of copper tailings as supplementary cementitious material can reduce the environmental impacts ofconcrete production and the mining industry. A key concern limiting its application is the potential leaching oftoxic metals from the cementitious matrix, especially copper. To analyze and reduce the risk of leaching, themechanisms by which copper is entrapped in the cementitious matrix were investigated, by combining micro-scopic and spectroscopic approaches. Decreasing the water-to-binder ratio was statistically relevant to reducecopper leaching. Scanning Electron Microscope micrographs allowed to spatially localize enriched copperclusters within the cementitious hydration products. In the early stages of the cementitious hydration (i.e., 24 h),no spatial correlation between copper and hydration products was found; however, after seven days, copper wasspatially associated with calcium silicate hydrates. Cu K-edge X-ray absorption near edge structure spectroscopyprovided insights into the chemical speciation of copper in the cementitious matrix. It showed that copper sulfideand oxide phases persisted, whereas the copper sulfate phases were prone to dissolution and reprecipitation ascupric hydroxides induced by the relatively high pH from calcium hydroxides formed during hydration. Pro-moting the formation of hydration products can further reduce copper leaching from the alkaline cementitiousmatrix. A better understanding of metal entrapment mechanisms could lead to new strategies that reduce themobility of toxic elements when using copper tailings, increasing their use as a replacement of cement. With thisknowledge, it is expected to answer if it is possible to improve the copper entrapment into the cementitiousmatrix and if there is a risk of leaching once is entrapped.
dc.format.extent11
dc.fuente.origenSIPA
dc.identifier.doi10.1016/j.jclepro.2021.127547
dc.identifier.issn0959-6526
dc.identifier.urihttps://doi.org/10.1016/j.jclepro.2021.127547
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/65758
dc.information.autorucEscuela de Ingeniería ; Pasten Gonzalez, Pablo Arturo ; 0000-0002-9961-9342 ; 10645469
dc.language.isoen
dc.nota.accesoContenido parcial
dc.pagina.final11
dc.pagina.inicio1
dc.revistaJournal of Cleaner Productiones_ES
dc.rightsacceso restringido
dc.subjectLeachinges_ES
dc.subjectChemical entrapmentes_ES
dc.subjectPhysical entrapmentes_ES
dc.subjectCementitious mixtureses_ES
dc.subjectCopper tailingses_ES
dc.titleCopper entrapment and immobilization during cement hydration in concrete mixtures containing copper tailingses_ES
dc.typeartículo
dc.volumen312
sipa.codpersvinculados10645469
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