✦ LIBER ✦

Time-dependent flow of cement pastes

✍ Scribed by Yasufumi Otsubo; Seiichi Miyai; Kaoru Umeya

Publisher: Elsevier Science
Year: 1980
Tongue: English
Weight: 429 KB
Volume: 10
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(80)90026-5

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✦ Synopsis

The time-dependent behavior of viscosity of clinker pastes was studied with a coaxial cylinder type viscometer.

In order to characterize the flow behavior of cement pastes, the flow curve obtained by the minimum values of shear stresses at different shear rates was proposed.

Two types of time dependence were found; the increase in viscosity caused by shearing and the increase in minimum viscosity caused by hydration.

The effect of sodium lignosulfonate on the flow behavior was also considered.

Die zeitabh~ngige Viskosit~t von Pasten aus Portlandklinker und Wasser wurde mit einem Rotationsviscosimeter studiert.

Um das FlieSverhalten von Zementpasten zu charakterisieren, wurde die FlieSkurve durch die minimalen Werte von Schupspannungen bei unterschiedlichen Schergeschwindigkeiten vorgeschlagen. Zwei Arten von Zeitabh~ngigkeit wurden gefunden; die Vermehrung der Viskosit~t durch Scherung und die Vermehrung der minimalen Viskosit~t durch Hydratation. Der Effekt von Natrium-Lignosulfonat auf dem FlieSverhalten wurde auch betrachtet.

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