Simulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixing

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dc.contributor.authorMoreno-Juez, Jaime
dc.contributor.authorTavares, Luís Marcelo
dc.contributor.authorArtoni, Riccardo
dc.contributor.authorCarvalho, Rodrigo M. de
dc.contributor.authorda Cunha, Emerson Reikdal
dc.contributor.authorCazacliu, Bogdan
dc.contributor.institutionTecnalia Research & Innovation
dc.contributor.institutionTRAZABILIDAD CIRCULAR
dc.date.issued2021-06-01
dc.descriptionPublisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
dc.description.abstractConcrete mixing can lead to mechanical degradation of aggregates, particularly when dealing with recycled concrete aggregates. In this work, the attrition of such materials during mixing is studied by means of experiments and simulations. The effect of the presence of fines, water addition, flow configuration of the mixer (co- or counter-current) and impeller frequency is discussed. Experiments were performed in a laboratory Eirich mixer. Discrete element numerical simulations (DEM) were performed on the same geometry by mimicking the behaviour of the material and, in particular, the cohesion induced by water and the cement paste using either Hertz–Mindlin or Hertz–Mindlin with Johnson–Kendall–Roberts (JKR) contact laws. The combination of the collision energy spectra extracted from the DEM simulations and an attrition model allowed the prediction of the mass loss due to attrition in 1-min experiments. Semi-quantitative agreement was observed between experiments and simulations, with a mean relative error of 26.4%. These showed that higher mass losses resulted from operation at the highest impeller speeds, co-current operation, and also with the wet aggregate. Mixing of the agglomerate in the concrete mix resulted in a significant reduction in attrition when compared to mixing aggregates alone. With further validation, the proposed simulation approach can become a valuable tool in the optimization of mixing by allowing the effects of material, machine and process variables to be studied on the mass loss due to attritionen
dc.description.statusPeer reviewed
dc.format.extent1
dc.format.extent1790700
dc.identifier.citationMoreno-Juez , J , Tavares , L M , Artoni , R , Carvalho , R M D , da Cunha , E R & Cazacliu , B 2021 , ' Simulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixing ' , Materials , vol. 14 , no. 11 , 3007 , pp. 3007 . https://doi.org/10.3390/ma14113007
dc.identifier.doi10.3390/ma14113007
dc.identifier.issn1996-1944
dc.identifier.otherresearchoutputwizard: 11556/1144
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85108015119&partnerID=8YFLogxK
dc.language.isoeng
dc.relation.ispartofMaterials
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subject.keywordsAttrition
dc.subject.keywordsConcrete mixing
dc.subject.keywordsDiscrete element method
dc.subject.keywordsRecycled concrete aggregates
dc.subject.keywordsAttrition
dc.subject.keywordsConcrete mixing
dc.subject.keywordsDiscrete element method
dc.subject.keywordsRecycled concrete aggregates
dc.subject.keywordsGeneral Materials Science
dc.subject.keywordsCondensed Matter Physics
dc.subject.keywordsFunding Info
dc.subject.keywordsThis research was partially funded by the Brazilian Research Agency CNPq (grant number 310293/2017-0).
dc.subject.keywordsThis research was partially funded by the Brazilian Research Agency CNPq (grant number 310293/2017-0).
dc.titleSimulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixingen
dc.typejournal article
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