Treatment of end-of-life concrete in an innovative heating-air classification system for circular cement-based products

dc.contributor.authorMoreno-Juez, J.
dc.contributor.authorVegas, Iñigo J.
dc.contributor.authorGebremariam, Abraham T.
dc.contributor.authorGarcía-Cortés, V.
dc.contributor.authorDi Maio, F.
dc.contributor.institutionTRAZABILIDAD CIRCULAR
dc.contributor.institutionGENERAL
dc.date.issued2020-08-01
dc.descriptionPublisher Copyright: © 2020 The Authors
dc.description.abstractA stronger commitment towards Green Building and circular economy, in response to environmental concerns and economic trends, is evident in modern industrial cement and concrete production processes. The critical demand for an overall reduction in the environmental impact of the construction sector can be met through the consumption of high-grade supplementary raw materials. Advanced solutions are under development in current research activities that will be capable of up-cycling larger quantities of valuable raw materials from the fine fractions of End-of-Life (EoL) concrete waste. New technology, in particular the Heating-Air classification System (HAS), simultaneously applies a combination of heating and separation processes within a fluidized bed-like chamber under controlled temperatures (±600 °C) and treatment times (25–40 s). In that process, moisture and contaminants are removed from the EoL fine concrete aggregates (0–4 mm), yielding improved fine fractions, and ultrafine recycled concrete particles (<0.125 mm), consisting mainly of hydrated cement, thereby adding value to finer EoL concrete fractions. In this study, two types of ultrafine recycled concrete (either siliceous or limestone EoL concrete waste) are treated in a pilot HAS technology for their conversion into Supplementary Cementitious Material (SCM). The physico-chemical effect of the ultrafine recycled concrete particles and their potential use as SCM in new cement-based products is assessed by employing substitutions of up to 10% of the conventional binder. The environmental viability of their use as SCM is then evaluated in a Life Cycle Assessment (LCA). The results demonstrated accelerated hydration kinetics of the mortars that incorporated these SCMs at early ages and higher mechanical strengths at all curing ages. Optimal substitutions were established at 5%. The results suggested that the overall environmental impact could be reduced by up to 5% when employing the ultrafine recycled concrete particles as SCM in circular cement-based products, reducing greenhouse gas emissions by as much as 41 kg CO2 eq./ton of cement (i.e. 80 million tons CO2 eq./year). Finally, the environmental impacts were reduced even further by running the HAS on biofuel rather than fossil fuel.en
dc.description.statusPeer reviewed
dc.format.extent1
dc.format.extent2870918
dc.identifier.citationMoreno-Juez , J , Vegas , I J , Gebremariam , A T , García-Cortés , V & Di Maio , F 2020 , ' Treatment of end-of-life concrete in an innovative heating-air classification system for circular cement-based products ' , Journal of Cleaner Production , vol. 263 , 121515 , pp. 121515 . https://doi.org/10.1016/j.jclepro.2020.121515
dc.identifier.doi10.1016/j.jclepro.2020.121515
dc.identifier.issn0959-6526
dc.identifier.otherresearchoutputwizard: 11556/909
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85083341267&partnerID=8YFLogxK
dc.language.isoeng
dc.relation.ispartofJournal of Cleaner Production
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subject.keywordsConcrete recycling technologies
dc.subject.keywordsEoL concrete recycling
dc.subject.keywordsRecovered SCM
dc.subject.keywordsCircular cement-based products
dc.subject.keywordsLCA
dc.subject.keywordsReduction of greenhouse gases
dc.subject.keywordsConcrete recycling technologies
dc.subject.keywordsEoL concrete recycling
dc.subject.keywordsRecovered SCM
dc.subject.keywordsCircular cement-based products
dc.subject.keywordsLCA
dc.subject.keywordsReduction of greenhouse gases
dc.subject.keywordsRenewable Energy, Sustainability and the Environment
dc.subject.keywordsBuilding and Construction
dc.subject.keywordsGeneral Environmental Science
dc.subject.keywordsStrategy and Management
dc.subject.keywordsIndustrial and Manufacturing Engineering
dc.subject.keywordsSDG 7 - Affordable and Clean Energy
dc.subject.keywordsSDG 8 - Decent Work and Economic Growth
dc.subject.keywordsSDG 12 - Responsible Consumption and Production
dc.subject.keywordsSDG 9 - Industry, Innovation, and Infrastructure
dc.subject.keywordsSDG 13 - Climate Action
dc.subject.keywordsProject ID
dc.subject.keywordsinfo:eu-repo/grantAgreement/EC/H2020/723582/EU/Cost-Effective Recycling of CDW in High Added Value Energy Efficient Prefabricated Concrete Components for Massive Retrofitting of our Built Environment/VEEP
dc.subject.keywordsinfo:eu-repo/grantAgreement/EC/H2020/723582/EU/Cost-Effective Recycling of CDW in High Added Value Energy Efficient Prefabricated Concrete Components for Massive Retrofitting of our Built Environment/VEEP
dc.subject.keywordsFunding Info
dc.subject.keywordsThe authors of the present paper, prepared in the framework ofthe Project VEEP "Cost-Effective Recycling of C&DW in High AddedValue Energy Efficient Prefabricated Concrete Components forMassive Retrofitting of our Built Environment", wish to acknowl-edge the European Commission for its support. This project hasreceived funding from the European Union’s Horizon 2020 researchand innovation programme under grant agreement No 723582.This paper reflects only the author’s view and the European Com-mission is not responsible for any use that may be made of theinformation it contains.The authors are also grateful to the Spanish Ministry of Science,Innovation and Universities (MICIU) and the European RegionalDevelopment Fund (FEDER) for funding this line of research(RTI2018-097074-B-C21).
dc.subject.keywordsThe authors of the present paper, prepared in the framework ofthe Project VEEP "Cost-Effective Recycling of C&DW in High AddedValue Energy Efficient Prefabricated Concrete Components forMassive Retrofitting of our Built Environment", wish to acknowl-edge the European Commission for its support. This project hasreceived funding from the European Union’s Horizon 2020 researchand innovation programme under grant agreement No 723582.This paper reflects only the author’s view and the European Com-mission is not responsible for any use that may be made of theinformation it contains.The authors are also grateful to the Spanish Ministry of Science,Innovation and Universities (MICIU) and the European RegionalDevelopment Fund (FEDER) for funding this line of research(RTI2018-097074-B-C21).
dc.titleTreatment of end-of-life concrete in an innovative heating-air classification system for circular cement-based productsen
dc.typejournal article
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