In almost every case, a high-range water-reducing admixture (HRWRA) will be
required along with the silica fume. The usual practice is to add all of
the water allowed by the maximum water-cementitious materials ratio and then
adjust slump using the HRWRA.
The Silica Fume Association
38860 Sierra Lane, Lovettsville, VA 20180
Tel: 540.257.4224 Fax: 540.822.9456