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Chapter 3 - Obtaining Silica-Fume Concrete
Producing SFC

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Slide
This graph shows that adding increasing amounts silica fume greatly increases the water demand for a constant-slump concrete. To be able to produce low water-cementitious materials ratio concrete, it is essential to use a high-range water-reducing admixture in conjunction with the silica fume.

As the w/cm becomes lower and lower for higher and higher levels of performance, it is not unusual to greatly exceed the manufacturer's recommendations on HRWRA dosage. This practice is not usually a problem, but be sure to look at the effect of the increased admixture on your time of setting.

This figure is taken from: V. M. Malhotra and G. G. Carette, "Silica Fume Concrete -- Properties, Applications, and Limitations," Concrete International, Vol. 5, No.5 , pp. 40-46.