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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: New Insights into the Retarding Effect of Aluminates on C3S Hydration
Author(s): E. Pustovgar, M. Palacios, J.-B. d’Espinose de Lacaillerie, T. Matschei, N. Ruffray, R. Verel, and R.J. Flatt
Publication: Special Publication
Appears on pages(s): 14.1-14.12
Keywords: aluminates; C3S; hydration; isothermal calorimetry; NMR
Abstract:Clinker replacement by supplementary cementitious materials (SCMs) is one of the most effective
routes to reduce the environmental impact of Portland cement. However, increasing amounts of alumina-rich
SCMs can reduce the reactivity and early mechanical strength of concrete. The reason of the lower strength
includes a lower reactivity of the SCMs, but possibly also a passivation induced by the aluminates released from
the SCMs on the silicates hydration.
In this study, we have investigated the effect of the aluminate ions on the hydration of tricalcium silicate (C3S)
by using a combination of several analytical techniques such as isothermal calorimetry, nuclear magnetic
resonance (NMR) and scanning electron microscopy. It has been revealed that the initial and total dosages of
aluminates play an important role on the length of the induction period and the time of the main peak position.
Results are consistent with C3S dissolution being rate limiting. Finally, the influence of Na2SO4 on the
passivation induced by the aluminates has been studied.
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