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Content of SiO2 in silica fume?

(a) 52%

(b) 35%

(c) 21.9%

(d) 85-97%

This question was posed to me in examination.

The query is from Factors Causing Variation in the Quality of Concrete topic in division Quality Control of Concrete Technology

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The correct answer is (d) 85-97%

Explanation: The content of SiO2 in silica fume is 85-97%. 35% is the content of SiO2 in Calcareous (ASTM C618 Class C) Fly Ash.

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