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Rachid Bouras, Mohend Chaouche, Salah Kaci
Influence of Viscosity-Modifying Admixtures on the Thixotropic Behaviour of Cement Pastes
Appl. Rheol. 18:4 (2008) 45604 (8 pages)
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Water soluble polymers such as cellulosic or starch ethers are often included in the mix-design of Self Compacting
Concretes (SCCs) in order to improve their stability and robustness. The stability, including resistance to
liquid-solid separation and sedimentation, may be attributed to the increase of the viscosity of the liquid phase
due to the thickening effect of the polymer. The later is then referred to as a Viscosity-Modifying Admixture
(VMA). In the present study, we consider the influence of VMAs on the rheological properties of the material at
cement scale level. In particular, the change in the thixotropic properties of the cement paste due to the inclusion
of VMA is investigated. It is found that addition of VMA significantly enhances rebuild-up kinetics at rest
following shearing at high shear rate. The influence of VMA on the steady state rheological properties is also
considered. As reported in the literature, the yield stress is found to monotonically increase with VMA content,
while the consistency presents a minimum indicating the existence of an optimum value of the VMA for which
the workability of the cement paste is maximum.
► Cite this publication as follows:
Bouras R, Chaouche M, Kaci S: Influence of Viscosity-Modifying Admixtures on the Thixotropic Behaviour of Cement Pastes, Appl. Rheol. 18 (2008) 45604.
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