Resting Time Effect on the Rheological Behavior of Cement Paste in Presence of Superplasticizer
Rheology has been widely used to describe the flow properties of fresh cement-based suspensions. Nevertheless, the effect of early hydration product formation on rheology, and the effect of shear on breaking of hydration bonds is not fully understood. Therefore, the characterization of the time-dependency of rheology has become necessary to predict precisely the behavior of concrete during placement. In this paper, variations in the resting time in between rheological tests were imposed to evaluate the effects on the development of internal structure of the mixture using different dispersing agents. Increasing resting time in between measurements mainly enhances viscosity, but the magnitude seems strongly dependent on the dispersant used. However, the effect of the employed procedure, as two procedures were evaluated, seems to have a stronger influence on the time-evolution of the rheological properties than changing the resting time in between measurements.
A. M. Ley-Hernández and D. Feys, "Resting Time Effect on the Rheological Behavior of Cement Paste in Presence of Superplasticizer," Cement and Concrete Research, vol. 142, Elsevier, Apr 2021.
The definitive version is available at https://doi.org/10.1016/j.cemconres.2020.106347
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Cement paste; Resting time; Rheology; Workability loss
International Standard Serial Number (ISSN)
Article - Journal
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01 Apr 2021