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ACI Spring 2010 Convention
March 21 - 25, 2010
Marriott Rivercenter Hotel & Henry B. Gonzalez Convention Center -- San Antonio, TX

NRMCA Sustainable Conference
April 12 - 15, 2010
Tempe, AZ

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May 10 - 12, 2010
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June 6 - 9, 2010
David L. Lawrence Convention Center - Pittsburgh, PA

ACI Fall 2010 Convention
October 24 - 28, 2010
The Westin Convention Center -- Pittsburgh, PA

Chapter 3 - Obtaining Silica-Fume Concrete
Producing SFC

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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.