Question

Which of the following cement are not used as a cement replacement?

(a) Siliceous fly ash

(b) Calcareous fly ash

(c) Silica fume

(d) Slag cement

This question was posed to me during an interview for a job.

This is a very interesting question from Cements, Metallurgical Coke and Synthetic Resins in division Miscellaneous Materials of Engineering Material & Metallurgy

Answer 1

Correct choice is (c) Silica fume

For explanation I would say: Siliceous fly ash, calcareous fly ash, and slag cement are common cement generally used as replacements of cement. Silica fume, on the other hand, is generally used as a property enhancer.