Use of Lightweight Sintered Fly Ash Aggregates in Concrete at High Temperatures

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dc.contributor.authorKřížová, Kláracs
dc.contributor.authorBubeník, Jancs
dc.contributor.authorSedlmajer, Martincs
dc.coverage.issue12cs
dc.coverage.volume12cs
dc.date.issued2022-11-29cs
dc.description.abstractThis study addresses the issue of the resistance to high temperatures of lightweight concrete lightweighted with sintered fly ash aggregate. Lightweight concretes with different amounts of lightweighting and their properties after loading temperatures of 600, 800 and 1000 °C were investigated. In particular, the effect of high temperature on the mechanical properties of the concrete was determined on the test specimens, and the effect on the microstructure was investigated by X-ray diffraction analysis and scanning electron microscopy. It was found that there is an increase in compressive strength between 0 and 21% up to 800 °C, where the increase in strength decreases with increasing degree of lightening. At 1000 °C, the internal structure of the lightweight concrete destabilized, and the compressive strength decreased in the range of 51–65%. After loading at 1000 °C, the scanning electron microscope showed the formation of spherical-shaped neoplasms, which significantly reduced the internal integrity of the cement matrix in the lightweight concrete due to the increase in their volume. It was found that the lightweight concretes with higher lightweighting showed significantly less degradation due to higher temperature.en
dc.formattextcs
dc.format.extent17cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationBuildings. 2022, vol. 12, issue 12, 17 p.en
dc.identifier.doi10.3390/buildings12122090cs
dc.identifier.issn2075-5309cs
dc.identifier.orcid0000-0003-1648-5295cs
dc.identifier.orcid0000-0002-9829-8903cs
dc.identifier.orcid0000-0003-2615-7922cs
dc.identifier.other180218cs
dc.identifier.researcheridAAD-5443-2019cs
dc.identifier.scopus25930597000cs
dc.identifier.urihttp://hdl.handle.net/11012/208569
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofBuildingscs
dc.relation.urihttps://www.mdpi.com/2075-5309/12/12/2090cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2075-5309/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectsintered fly ashen
dc.subjectAgloporiteen
dc.subjectlight weight concrete (LWC)en
dc.subjectcompressive strengthen
dc.subjecthigh temperaturesen
dc.subjectfire resistanceen
dc.titleUse of Lightweight Sintered Fly Ash Aggregates in Concrete at High Temperaturesen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-180218en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:46:00en
sync.item.modts2025.01.17 19:33:19en
thesis.grantorVysoké učení technické v Brně. Fakulta stavební. Ústav technologie stavebních hmot a dílcůcs
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