Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-9928
For citation please use:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorPott, Ursula-
dc.contributor.authorJakob, Cordula-
dc.contributor.authorJansen, Daniel-
dc.contributor.authorNeubauer, Jürgen-
dc.contributor.authorStephan, Dietmar-
dc.date.accessioned2020-04-28T06:14:25Z-
dc.date.available2020-04-28T06:14:25Z-
dc.date.issued2020-02-21-
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11040-
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-9928-
dc.description.abstractThe rheological behavior of cement paste and the improvement of its flowability takes center stage in many research projects. An improved flowability can be achieved by the addition of superplasticizers (SP), such as polycarboxylate ethers (PCE). In order to be able to use these PCEs effectively and in a variety of ways and to make them resistant to changes in the environment, it is crucial to understand the influence of SPs on cement hydration. For that reason, the topic of this paper was the incompatibility of a specific SP and an ordinary Portland cement (OPC). The incompatible behavior was analyzed using rheological tests, such as the spread flow test and penetration test, and the behavior was compared by means of an ultrasound technique and explained by the phase content measured by in-situ X-ray diffraction (XRD) the heat evolution measured by calorimetry, and scanning electron microscope (SEM) images. We showed that the addition of the SP in a high dosage led to a prevention of the passivation of the most reactive and aluminum-containing clinker phases, aluminate and brownmillerite. This induced the aluminate reaction to take place in the initial period and led to an immediate stiffening of the cement paste and, therefore, to the complete loss of workability. The results showed that in addition to the ettringite, which began to form directly after water addition, hemicarbonate precipitated. The fast stiffening of the paste could be prevented by delayed addition of the SP or by additional gypsum. This fast stiffening was not desirable for SPs, but in other fields, for example, 3D printing, this undesirable interaction could be used to improve the properties of printable mortar.en
dc.description.sponsorshipDFG, 386869775, Rheologie wirksame Additive in Portlandzement-basierten Formulierungen - Von nano/mikro-skaligen Strukturen zu makroskopischen Eigenschaften -en
dc.description.sponsorshipDFG, 313773090, SPP 2005: Opus Fluidum Futurum - Rheologie reaktiver, multiskaliger, mehrphasiger Baustoffsystemeen
dc.description.sponsorshipDFG, 414044773, Open Access Publizieren 2019 - 2020 / Technische Universität Berlinen
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc660 Chemische Verfahrenstechnikde
dc.subject.otherrheologyen
dc.subject.otherincompatibility of superplasticizeren
dc.subject.otherhydrationen
dc.subject.otherspread flow testen
dc.subject.otherpenetrationen
dc.subject.otherin-situ XRDen
dc.subject.othercalorimetryen
dc.subject.otherultrasounden
dc.subject.otherSEMen
dc.titleInvestigation of the Incompatibilities of Cement and Superplasticizers and Their Influence on the Rheological Behavioren
dc.typeArticleen
dc.date.updated2020-03-05T20:30:36Z-
tub.accessrights.dnbfreeen
tub.publisher.universityorinstitutionTechnische Universität Berlinen
dc.identifier.eissn1996-1944-
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.3390/ma13040977en
dcterms.bibliographicCitation.journaltitleMaterialsen
dcterms.bibliographicCitation.originalpublisherplaceBaselen
dcterms.bibliographicCitation.volume13en
dcterms.bibliographicCitation.originalpublishernameMDPIen
dcterms.bibliographicCitation.issue4en
dcterms.bibliographicCitation.articlenumber977en
Appears in Collections:FG Baustoffe und Bauchemie » Publications

Files in This Item:
materials-13-00977-v2.pdf
Format: Adobe PDF | Size: 12.72 MB
DownloadShow Preview
Thumbnail

Item Export Bar

This item is licensed under a Creative Commons License Creative Commons