Physical properties are important in both the micro-filler and pozzolanic
roles of silica fume. The very small size of the silica fume particles is
also one of the keys to its performance. The values for bulk density are of
interest primarily for transportation. The very high surface area can be
estimated using the nitrogen adsorption (BET) method only. Surface area
determinations based upon sieve analysis are meaningless.
For terms of reference, 60,000 to 150,000 ft2/lb is about 1.4 to 3.4 acres
of surface area per pound of silica fume.
The Silica Fume Association
38860 Sierra Lane, Lovettsville, VA 20180
Tel: 540.257.4224 Fax: 540.822.9456
