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The influences of cement hydration and temperature on the thixotropy of cement paste

Link, J.; Sowoidnich, T.; Pfitzner, C.; Gil-Diaz, T.; Heberling, F.; Lützenkirchen, J.; Schäfer, T.; Ludwig, H.-M.; Haist, M.

Abstract:
The rheological properties of fresh cement paste are highly influenced by a large number of parameters, among which the most important factors are the applied shear stress, and the shear history, the age of the sample and the temperature. The effects of these parameters on the yield stress (designated as structural limit stress in this work), the viscosity and the structural recovery rate (i.e., the change in dynamic viscosity with time at rest) were studied. In parallel, the changes in ion composition of the carrier liquid, mineral phase content and granulometry were investigated. The results reveal that all investigated rheological parameters exhibit an approximated bi-linear trend with respect to the degree of hydration, with a period of quasi-constant properties until a degree of hydration of approximately 0.07, followed by a non-linear increase. This increase could be attributed to the formation of calcium hydroxide (CH) and calcium-silicate-hydrate (C-S-H) via calorimetry results. With regard to the effect of the shear history of the sample on the rheological properties, the structural limit stress showed a minor dependency on the shear history immediately after the end of shearing, which, however, vanished within the first minute at rest. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000119899
Veröffentlicht am 03.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000119899
Erschienen in Materials
Band 13
Heft 8
Seiten Art. Nr.: 1853
Vorab online veröffentlicht am 15.04.2020
Schlagwörter rheology, hydration, thixotropy, cement paste, opus fluidum futurum
Nachgewiesen in Scopus
Web of Science
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