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Spent brewery grains for improvement of thermal insulation of ceramic bricks

2013Journal article Restricted access
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dc.contributor.authorFerraz, Eduardo
dc.contributor.authorCoroado, João
dc.contributor.authorGamelas, José
dc.contributor.authorSilva, Joaquim Pedro
dc.contributor.authorRocha, Fernando
dc.contributor.authorVelosa, Ana Luísa
dc.date.accessioned2021-12-22T22:49:32Z
dc.date.available2021-12-22T22:49:32Z
dc.date.issued2013
dc.date.updated2021-12-22T18:44:20Z
dc.description.abstractOne by-product of the brewing process is a waste containing spent grains (barley malt and maize grits). In the brewing process, this cake is composed mainly of organic matter containing high fiber content, provided by the separation of suspended particles through wort filtration. The study presented here was carried out to assess if the spent brewery grains could be recycled through their incorporation in a paste used in the manufacture of ceramic bricks, and how such incorporation affects some of the physical properties, namely mechanical strength, porosity, and thermal conductivity of the ceramic material. The main objective of the study was to decrease the thermal conductivity of the ceramic paste without significant losses of the mechanical strength of the final product. Spent brewery grains (SBG) characterized by powder X-ray diffraction, X-ray fluorescence spectrometry, scanning electron microscopy, thermogravimetry, differential scanning calorimetry, and heat of combustion were used as an additive (pore-forming agent) to a brick paste, characterized by powder X-ray diffraction, particle-size analysis, mechanical strength, plasticity index, and thermal conductivity determinations. Powder mixtures obtained by addition of 5, 10, and 15% by weight of dry SBG to brick raw material (SBG-to-brick paste weight) were assembled. The powder mixtures were extruded and the green probes were dried (105°C) before slow firing at 900, 950, and 1,000°C. Drying and firing shrinkages and mechanical bending strengths were investigated in addition to bulk density, open porosity, water absorption, and thermal conductivity of the fired samples. The mixture of ceramic paste with SBG fired up to 900°C with an incorporation of SBG of 5% by weight was found to reach a compromise between the highest mechanical bending strength (15 MPa) and the lowest thermal conductivity (0.46 Wm−1K−1). When compared with the ceramic paste without SBG incorporation, a diminution of 12 and 28% of the values of these properties, respectively, was obtained.pt_PT
dc.description.sponsorshipThe authors are grateful to Sociedade Central de Cervejas e Bebidas, SA (Vialonga, Portugal) for the valuable support and assistance being provided and to Profa. Dra. Maria Ermelinda da Silva Eusébio, Prof. Dr. Mário Túlio dos Santos Rosado, and Dra. Carla Carvalho from Chemistry Department, University of Coimbra (Portugal) for the assistance with the heat of combustion measurements. This research was supported by the Projecto Estratégico - UI 4035 - 2011-2012 (PEst-C/CTE/UI4035/2011) financed by the Fundação para a Ciência e a Tecnologia (FCT).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1061/(ASCE)MT.1943-5533.0000729pt_PT
dc.identifier.eid2-s2.0-84886882253
dc.identifier.slugcv-prod-55440
dc.identifier.urihttp://hdl.handle.net/10400.26/38415
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectMixturespt_PT
dc.subjectSpent brewery grainspt_PT
dc.subjectAshespt_PT
dc.subjectThermal conductivitypt_PT
dc.subjectPerformance characteristicspt_PT
dc.titleSpent brewery grains for improvement of thermal insulation of ceramic brickspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1646pt_PT
oaire.citation.issue11pt_PT
oaire.citation.startPage1638pt_PT
oaire.citation.titleJournal of Materials in Civil Engineeringpt_PT
oaire.citation.volume25pt_PT
person.familyNameFerraz
person.familyNamePereira de Freitas Coroado
person.givenNameEduardo
person.givenNameJoão Paulo
person.identifierKZVOi4AAAAJ
person.identifier.ciencia-idC517-A240-7C81
person.identifier.ciencia-idEE18-AE33-AAEF
person.identifier.orcid0000-0003-4717-6305
person.identifier.orcid0000-0001-6743-9278
person.identifier.ridB-7140-2014
person.identifier.scopus-author-id7003480912
person.identifier.scopus-author-id8969808500
rcaap.cv.cienciaidC517-A240-7C81 | Eduardo Jorge Marques de Oliveira Ferraz
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication94c2590f-fd7a-44e1-b6cd-31297c9da934
relation.isAuthorOfPublication31d18b91-1c59-40fb-91aa-5242ff9bb7ae
relation.isAuthorOfPublication.latestForDiscovery31d18b91-1c59-40fb-91aa-5242ff9bb7ae

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