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Título

Evaluation of chloride transport in blended cement mortars containing coal mining waste

AutorCaneda-Martínez, Laura CSIC ORCID CVN; Frías, Moisés CSIC ORCID ; Medina, César; Sánchez de Rojas, María Isabel CSIC ORCID; Rebolledo, Nuria CSIC ORCID; Sánchez-Montero, Javier CSIC ORCID
Palabras claveCoal mining waste
Blended cement
Fecha de publicación2018
EditorElsevier
CitaciónConstruction and Building Materials 190: 200–210 (2018)
ResumenIn this study, the effect of the addition of a thermally activated coal mining waste (CMW) on the chloride permeability of blended cements in amounts from 10 to 50% was assessed by salt ponding test. The parameters involved in the infiltration of chloride have been evaluated by XRD, TG and MIP techniques, as well as by electric resistivity measurements. A remarkable improvement in chloride diffusion was found as the CMW content increased, which has resulted in a decrease of one order of magnitude in the chloride diffusion coefficients of specimens containing 50% of CMW (2.7·10−12 m2/s) with respect to OPC samples (20·10−12 m2/s). The chemical analyses have shown that immobilization of chloride ions as Friedel’s salt takes place as a result of their reaction with the abundant hydrated aluminate phases formed as a consequence of the high alumina content in CMW. Moreover, it has been observed a refinement of the capillary network with the addition of CMW that has been manifested through a decrease in pore size and a subsequent increase in electrical resistivity.
Versión del editorhttps://doi.org/10.1016/j.conbuildmat.2018.09.158
URIhttp://hdl.handle.net/10261/173202
DOI10.1016/j.conbuildmat.2018.09.158
ISSN0950-0618
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