Working mechanism of calcium nitrate as an accelerator for Portland cement hydration

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dc.contributor.authorDorn, Tobias
dc.contributor.authorHirsch, Tamino
dc.contributor.authorStephan, Dietmar
dc.date.accessioned2022-12-19T10:10:36Z
dc.date.available2022-12-19T10:10:36Z
dc.date.issued2022-09-14
dc.date.updated2022-11-22T17:53:00Z
dc.description.abstractPrecast concrete, cold weather concreting, and the emerging technique of concrete additive manufacturing are applications in which the acceleration of cement hydration plays a critical role. To allow precise control of early cement hydration in these applications, a thorough understanding of the working mechanisms of cement hydration accelerators is required. This study contributes to the understanding of the mechanism by which calcium nitrate (Ca(NO3)2) influences early cement hydration. The influence of Ca(NO3)2 on the hydration of an ordinary Portland cement has been followed by isothermal calorimetry, in situ X‐ray diffraction (XRD), quantitative XRD, compressive strength testing, and the analysis of the pore solution composition. Further, the initial pore solution, the initial phase composition, and the phase composition in the fully hydrated cement have been estimated by thermodynamic calculations to corroborate the experimentally obtained results. The results indicate that Ca(NO3)2, especially at the highest analyzed dosage of 5 wt.%, enhances the formation of ettringite and a nitrate‐containing AFm phase. Furthermore, Ca(NO3)2 accelerates alite hydration. Besides the increased Ca concentration in solution, it has been found that a reduction of the Al concentration in the initial pore solution by Ca(NO3)2 possibly contributes to the accelerating effect of Ca(NO3)2 on alite hydration.en
dc.description.sponsorshipBMBF, 03XP0122A, BauProAddi - Neues Baustoff- und Produktionsdesign für additive Fertigungsprozesse im Bauwesen
dc.description.sponsorshipTU Berlin, Open-Access-Mittel – 2022
dc.identifier.eissn1551-2916
dc.identifier.issn0002-7820
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/17841
dc.identifier.urihttps://doi.org/10.14279/depositonce-16630
dc.language.isoen
dc.relation.ispartof10.14279/depositonce-19595
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.ddc660 Chemische Verfahrenstechnikde
dc.subject.otheracceleration
dc.subject.otheradditives
dc.subject.otherhydration
dc.subject.otherPortland cement
dc.subject.otherthermodynamics
dc.titleWorking mechanism of calcium nitrate as an accelerator for Portland cement hydrationen
dc.typeArticle
dc.type.versionpublishedVersion
dcterms.bibliographicCitation.doi10.1111/jace.18782
dcterms.bibliographicCitation.issue1
dcterms.bibliographicCitation.journaltitleJournal of the American Ceramic Societyen
dcterms.bibliographicCitation.originalpublishernameWiley
dcterms.bibliographicCitation.originalpublisherplaceNew York, NY
dcterms.bibliographicCitation.pageend766
dcterms.bibliographicCitation.pagestart752
dcterms.bibliographicCitation.volume106
tub.accessrights.dnbfree
tub.affiliationFak. 6 Planen Bauen Umwelt::Inst. Bauingenieurwesen::FG Baustoffe und Bauchemie
tub.publisher.universityorinstitutionTechnische Universität Berlin

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