Assessment of a conservative mixing model for the evaluation of constituent behavior below river confluences, Elqui River Basin, Chile

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dc.contributor.authorRossi, Catalina
dc.contributor.authorOyarzún, Jorge
dc.contributor.authorPasten Gonzalez, Pablo Arturo
dc.contributor.authorRunkel, Robert L.
dc.contributor.authorNúñez, Jorge
dc.contributor.authorDuhalde, Denisse
dc.contributor.authorMaturana, Hugo
dc.contributor.authorRojas, Eduardo
dc.contributor.authorArumí, José L.
dc.contributor.authorCastillo, Daniela
dc.contributor.authorOyarzún, Ricardo
dc.date.accessioned2022-11-25T15:41:55Z
dc.date.available2022-11-25T15:41:55Z
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.extent12 páginas
dc.fuente.origenSIPA
dc.identifier.doi10.1002/rra.3823
dc.identifier.eissn1535-1467
dc.identifier.urihttps://doi.org/10.1002/rra.3823
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/65755
dc.information.autorucEscuela de Ingeniería ; Pasten Gonzalez, Pablo Arturo ; 0000-0002-9961-9342 ; 10645469
dc.issue.numero7
dc.language.isoen
dc.nota.accesoContenido parcial
dc.pagina.final978
dc.pagina.inicio967
dc.revistaRiver Research and Applicationses_ES
dc.rightsacceso restringido
dc.subjectAcid drainagees_ES
dc.subjectElqui River Basines_ES
dc.subjectLOADESTes_ES
dc.subjectNonconservative behaviores_ES
dc.titleAssessment of a conservative mixing model for the evaluation of constituent behavior below river confluences, Elqui River Basin, Chilees_ES
dc.typeartículo
dc.volumen37
sipa.codpersvinculados10645469
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