Silica fume (Elkem Materials, Pittsburgh, PA, microsilica
EMS 965) was used for the sake of comparison in three
proportions by weight relative to cement, namely, 0:100,
50:50, and 100:0. The silica fume had particle size ranging
from 0.03 to 0.5 Am, with an average size of 0.2 Am. Its
composition is shown in Table 2. Comparison of Tables 1
and 2 shows that silica fume contains much more SiO2 and
much less Fe2O3 than fly ash.
Silica fume (Elkem Materials, Pittsburgh, PA, microsilicaEMS 965) was used for the sake of comparison in threeproportions by weight relative to cement, namely, 0:100,50:50, and 100:0. The silica fume had particle size rangingfrom 0.03 to 0.5 Am, with an average size of 0.2 Am. Itscomposition is shown in Table 2. Comparison of Tables 1and 2 shows that silica fume contains much more SiO2 andmuch less Fe2O3 than fly ash.
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