Experimental Study of Slag Changes during the Very Early Stages of Its Alkaline Activation

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dc.contributor.authorBílek, Vlastimilcs
dc.contributor.authorHrubý, Petrcs
dc.contributor.authorIliushchenko, Valeriiacs
dc.contributor.authorKoplík, Jancs
dc.contributor.authorKřikala, Jakubcs
dc.contributor.authorMarko, Michalcs
dc.contributor.authorHajzler, Jancs
dc.contributor.authorKalina, Lukášcs
dc.coverage.issue1cs
dc.coverage.volume15cs
dc.date.accessioned2022-01-14T15:56:25Z
dc.date.available2022-01-14T15:56:25Z
dc.date.issued2021-12-29cs
dc.description.abstractThe very early stages of alkaline activation of slag control its rheology and setting, but also affect its hydration, which occurs later. Simultaneously, these parameters are dictated by the nature and dose of the alkaline activator. Therefore, we investigated and compared the changes in slag particles (SEM, BET, laser diffraction), as well as in the pore solution composition (ICP–OES), pH, and conductivity, of alkali-activated slag (AAS) pastes containing the three most common sodium activators (waterglass, hydroxide, and carbonate) and water during the first 24 h of its activation. To ensure the best possible comparability of the pastes, a fairly nontraditional mixture design was adopted, based on the same concentration of Na+ (4 mol/dm3) and the same volume fraction of slag in the paste (0.50). The results were correlated with the pastes’ hydration kinetics (isothermal calorimetry), structural build-up (oscillatory rheology), and setting times (Vicat). Great differences were observed in most of these properties, in the formation of hydration products, and in the composition of the pore solution for each activator. The results emphasize the role of the anionic groups in the activators and of the pH, which help predict the sample’s behavior based on its calorimetric curve, and offer data for further comparisons and for the modelling of AAS hydration for specific activators.en
dc.formattextcs
dc.format.extent1-21cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationMaterials . 2021, vol. 15, issue 1, p. 1-21.en
dc.identifier.doi10.3390/ma15010231cs
dc.identifier.issn1996-1944cs
dc.identifier.other175897cs
dc.identifier.urihttp://hdl.handle.net/11012/203313
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofMaterialscs
dc.relation.urihttps://www.mdpi.com/1996-1944/15/1/231cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1996-1944/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectalkali-activated slagen
dc.subjectactivatoren
dc.subjecthydration kineticsen
dc.subjectpore solutionen
dc.subjectscanning electron microscopyen
dc.subjectBET surfaceen
dc.subjectmorphologyen
dc.subjecthydration productsen
dc.subjectsettingen
dc.titleExperimental Study of Slag Changes during the Very Early Stages of Its Alkaline Activationen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-175897en
sync.item.dbtypeVAVen
sync.item.insts2022.03.03 16:55:13en
sync.item.modts2022.03.03 16:15:21en
thesis.grantorVysoké učení technické v Brně. Fakulta chemická. Ústav chemie materiálůcs
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