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Chapter 3 - Obtaining Silica-Fume Concrete
Proportioning SFC

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Slide
Mixing in a laboratory mixer may not be vigorous enough to break up all of the silica-fume agglomerations in the densified form of the product. Either use undensified silica fume or batch densified silica fume with the coarse aggregate and mix for several minutes before adding the remainder of the ingredients.

Depending upon silica-fume content and water-cementitious materials ratio, there may be no measurable slump before the chemical admixtures are added. It may be appropriate to add a WRA early in the mixing process and a HRWRA after the cementitious materials are wetted.