Analyzing the early structural build-up of accelerated cement pastes

dc.contributor.authorDorn, Tobias
dc.contributor.authorHirsch, Tamino
dc.contributor.authorStephan, Dietmar
dc.date.accessioned2021-05-31T10:46:11Z
dc.date.available2021-05-31T10:46:11Z
dc.date.issued2021-03-10
dc.description.abstractExtrusion-based additive manufacturing imposes high requirements on the material stability right after the extrusion. Therefore, a thorough understanding of the chemical reactions that determine the early reduction in processability is necessary. Accelerators are especially considered here, which have a major influence on the early reaction. This study contributes to these issues by analyzing the influence of 0.1 wt% TEA (triethanolamine) and 2.0 wt% Ca(NO3)2 on the hydration of two CEM I 52.5 R. The hydration was analyzed by isothermal heat flow calorimetry and in-situ X-ray diffraction. Vicat needle penetration, a penetrometer of own design, and ultrasonic P-wave velocity development were used to monitor the early change in workability. The obtained results indicate that ettringite formation is the main factor influencing workability during the first 60 min of hydration. Afterwards, the influence of ettringite is exceeded by the formation of C–S–H. Ca(NO3)2 was shown to enhance C–S–H formation and had no significant effect on the workability during the first 60 min of hydration while rapidly decreasing workability during the induction period. TEA was shown to increase brownmillerite dissolution and ettringite formation and, consequently, promote the workability loss during the initial hydration period. The time of initial and final setting determined by the Vicat needle test depended mainly on the formation of C–S–H phases.en
dc.description.sponsorshipTU Berlin, Open-Access-Mittel – 2021en
dc.description.sponsorshipBMBF, 03XP0122A, BauProAddi - Neues Baustoff- und Produktionsdesign für additive Fertigungsprozesse im Bauwesenen
dc.identifier.eissn1871-6873
dc.identifier.issn1359-5997
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/13174
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-11968
dc.language.isoenen
dc.relation.ispartof10.14279/depositonce-19595
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc540 Chemie und zugeordnete Wissenschaftende
dc.subject.othercement hydrationen
dc.subject.otheraccelerationen
dc.subject.othercalcium nitrateen
dc.subject.otherTriethanolamineen
dc.subject.otherOPCen
dc.subject.otherin-situ X-ray diffractionen
dc.titleAnalyzing the early structural build-up of accelerated cement pastesen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber67en
dcterms.bibliographicCitation.doi10.1617/s11527-021-01662-5en
dcterms.bibliographicCitation.journaltitleMaterials and Structuresen
dcterms.bibliographicCitation.originalpublishernameSpringer Natureen
dcterms.bibliographicCitation.originalpublisherplaceHeidelbergen
dcterms.bibliographicCitation.volume54en
tub.accessrights.dnbfreeen
tub.affiliationFak. 6 Planen Bauen Umwelt::Inst. Bauingenieurwesen::FG Baustoffe und Bauchemiede
tub.affiliation.facultyFak. 6 Planen Bauen Umweltde
tub.affiliation.groupFG Baustoffe und Bauchemiede
tub.affiliation.instituteInst. Bauingenieurwesende
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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