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What is the most dominant constituent of cement?

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What is the most dominant constituent of cement?

(a) Silica

(b) Lime

(c) Magnesia

(d) Alumina

The question was posed to me in a job interview.

I want to ask this question from Ingredients of Cement in chapter Materials for Construction of Basic Civil Engineering

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The correct answer is (b) Lime

The best explanation: Cement contains about 60-65% of lime.  Silica constitutes 17-25%, alumina 3-8% and magnesia 1-3%.

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