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Preliminary Study of Recycled Aggregate Mortar for Electric Arc Furnace Dust Encapsulation

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Autor
Ledesma, Enrique F.
Lozano Lunar, Angélica
Ferreira, Ruan L. S.
Fernández Rodríguez, José María
Jiménez, José Ramón
Editor
MDPI
Fecha
2021
Materia
Electric Arc Furnace Dust
Recycled concrete aggregates
Mechanical behavior mortar
Leaching behavior mortar
Encapsulation hazardous waste
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Resumen
This article shows the preliminary results of a study carried out to determine the technical feasibility of encapsulating a high percentage of EAFD in cement-based mortars manufactured with the fine fraction of recycled concrete aggregates (RCA). Two families of mortars, with natural aggregate as a reference and with RCA, were studied. An incorporation rate by weight of two parts mortar to one part EAFD was tested. The mechanical strengths (compressive strength and tensile strength) before and after immersion in water, the rate of delitescence and the leaching behavior were studied. Mortars made with RCA showed similar mechanical strengths to the reference mortars made with natural aggregates; however, the incorporation of EAFD decreased the mechanical strengths. Encapsulation considerably reduced the leaching of heavy metals, although the Pb concentration remained above the hazardous waste limit. With this preliminary study, two wastes are managed together, and the results have shown that the use of RCA instead of natural aggregate is a viable alternative since it does not significantly impair the mechanical or leaching properties of the cement-based matrices used to encapsulate EAFD.
URI
http://hdl.handle.net/10396/21885
Fuente
Applied Sciences 11(20), 9525 (2021)
Versión del Editor
https://doi.org/10.3390/app11209525
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