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Rheological behavior of self-compacting concrete cement pastes
The rheological behavior of a cement paste used in Self-Compacting Concrete (SCC) formulations is compared to that of an 'ordinary' cement paste (OC) devoid of polymer additives. The rheological behavior is investigated here in squeeze flow geometry. By considering the evolution of the squeeze force for different velocities as a function of the instantaneous distance between the discs, it is found that the behaviors of the two cement pastes are qualitatively different. For the OC pastes, the force decreases with increasing squeeze velocity for any given discs separation, indicating that the material is undergoing fluid-solid separation due to filtration of the fluid phase through the porous media made up by the grains. Such behavior reflects the very poor flowability of the OC paste. The behavior of the SCC paste is qualitatively different. Above a certain critical value of the speed Uc, the force is an increasing function of the speed for a large interval of given disc's distances. Under these flow conditions the rheological behavior of the material is that of a viscous, although highly non-Newtonian, fluid which corresponds to the flowability conditions of the material. For squeeze speeds smaller than Uc, the rheological behavior of the SCC paste is similar to that of OC, indicating that below this critical velocity the material undergoes solid-fluid separation corresponding then to its nonflowability zone.
Rheological behavior of self-compacting concrete cement pastes
The rheological behavior of a cement paste used in Self-Compacting Concrete (SCC) formulations is compared to that of an 'ordinary' cement paste (OC) devoid of polymer additives. The rheological behavior is investigated here in squeeze flow geometry. By considering the evolution of the squeeze force for different velocities as a function of the instantaneous distance between the discs, it is found that the behaviors of the two cement pastes are qualitatively different. For the OC pastes, the force decreases with increasing squeeze velocity for any given discs separation, indicating that the material is undergoing fluid-solid separation due to filtration of the fluid phase through the porous media made up by the grains. Such behavior reflects the very poor flowability of the OC paste. The behavior of the SCC paste is qualitatively different. Above a certain critical value of the speed Uc, the force is an increasing function of the speed for a large interval of given disc's distances. Under these flow conditions the rheological behavior of the material is that of a viscous, although highly non-Newtonian, fluid which corresponds to the flowability conditions of the material. For squeeze speeds smaller than Uc, the rheological behavior of the SCC paste is similar to that of OC, indicating that below this critical velocity the material undergoes solid-fluid separation corresponding then to its nonflowability zone.
Rheological behavior of self-compacting concrete cement pastes
Phan, T.H. (author) / Moranville, M. (author) / Chaouche, M. (author)
2005
6 Seiten, 3 Bilder, 4 Tabellen, 7 Quellen
Conference paper
English
Rheological Behavior of Self-Compacting Concrete Cement Pastes
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