This slide shows the effects of adding increasing amounts of silica fume to
a low water-cementitious ratio, air-entrained concrete. Note that:
1. Increased strength will be seen at all ages.
2. There is a diminishing return that governs the addition of silica fume.
Strength will not continue to increase at the same rate with increased
additions.
This concrete mixture is typical of what has been used in many parking
structures and bridge decks, where the amount of silica fume added would be
approximately 7.5 percent. This mixture would not be optimal for
high-strength applications. See the following slides for high-strength
concrete performance.
The Silica Fume Association
38860 Sierra Lane, Lovettsville, VA 20180
Tel: 540.257.4224 Fax: 540.822.9456
