Abstract
Abstract The production of condensed silica fume (CSF) from the silicon and ferrosilicon furnaces of a Canadian plant was sampled at regular intervals over a period of 180 days in 1982. For each type of furnace the variability in composition, specific surface area, fineness, and pozzolanic activity of the material were determined. The results indicate that only a few samples are responsible for the majority of outliers in chemical composition and fineness by a 45-µm sieve, and these generally also account for some deviations in pozzolanic activity. The type of furnace affects the composition, specific surface area, and fineness of condensed silica fume; however, the pozzolanic activities of the two types of material are, with minor exceptions, comparable.
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