SI version of previous slide. 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.
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