Long-term Observation of Yeelimite Clinker Hydration in Environment of Saturated Water Vapour

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dc.contributor.authorPekárková, Janacs
dc.contributor.authorKulísek, Karelcs
dc.contributor.authorGazdič, Dominikcs
dc.contributor.authorFridrichová, Marcelacs
dc.coverage.issue1cs
dc.coverage.volume151cs
dc.date.accessioned2022-05-10T14:54:13Z
dc.date.available2022-05-10T14:54:13Z
dc.date.issued2016-08-03cs
dc.description.abstractDue to ecological overloading decrease, industrial by-products are utilized. Fly ash also belongs among these by-products. In Portland-composite cements, the high-temperature fly ash is applied nowadays, but fluidized bed combustion fly ash (FBC fly ash) is not used. The reason is that the FBC fly ash hydrates to form an undesirable ettringite, C3A.3CaSO4.32H2O. Decomposition temperature of ettringite in ambient conditions is most often mentioned in a range of 50 °C to 110 °C. In order to assess the ettringite long-term stability, ettringite was synthesized by hydration of mineral yeelimite, 3CaO.3Al2O3.CaSO4. The aim of this paper is long-term observation of the hydration of yeelimite in environment of saturated water vapour and examination of how stable the products of hydration are under given conditions. Raw materials for preparation of yeelimite were gypsum, limestone and corundum, weighed according to stoichiometric ratio of yeelimite. The mixture was heated at temperature of 1200 °C, soak 3 hours. After quenching and grinding, yeelimite was hydrated with a water-yeelimite ratio of 0.3. The system was cured as pastes and stored in conditions at laboratory temperature and in settings of saturated water vapour (100% R.H.). In order to follow the progress of synthesis regularly, namely up to age of 180 days of hydration, X-ray diffraction (XRD) was chosen using diffractometer Empyrean PANalytical (CuK-alpha). Based on the XRD patterns, only minor part of ettringite was formed, whilst a majority of yeelimite was preserved. It has been found that ettringite was not the only one product of yeelimite hydration. From an age of 20 days of hydration, a small amount of monosulfate was identified, whose quantity rose gradually. Especially at later ages of hydration, transformation of ettringite into monosulfate was observed.en
dc.formattextcs
dc.format.extent94-99cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationProcedia Engineering. 2016, vol. 151, issue 1, p. 94-99.en
dc.identifier.doi10.1016/j.proeng.2016.07.385cs
dc.identifier.isbn978-1-5108-2855-1cs
dc.identifier.issn1877-7058cs
dc.identifier.other127929cs
dc.identifier.urihttp://hdl.handle.net/11012/204209
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofProcedia Engineeringcs
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S1877705816317738cs
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1877-7058/cs
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/cs
dc.subjectYeeilimiteen
dc.subjectettringiteen
dc.subjectmonosulfateen
dc.subjectsaturated water vapouren
dc.subjectbed combustion fly ashen
dc.titleLong-term Observation of Yeelimite Clinker Hydration in Environment of Saturated Water Vapouren
dc.type.driverconferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-127929en
sync.item.dbtypeVAVen
sync.item.insts2022.05.10 16:54:13en
sync.item.modts2022.05.10 16:14:16en
thesis.grantorVysoké učení technické v Brně. Fakulta stavební. Ústav technologie stavebních hmot a dílcůcs
thesis.grantorVysoké učení technické v Brně. Fakulta stavební. Centrum AdMaS - VP1 - TSHcs
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