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Which of the following adds a quick-setting property to cement?

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Which of the following adds a quick-setting property to cement?

(a) Magnesium oxide

(b) Silicon dioxide

(c) Iron oxide

(d) Aluminium oxide

I had been asked this question during an online exam.

I'm obligated to ask this question of Ingredients of Cement in section Materials for Construction of Basic Civil Engineering

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Correct answer is (d) Aluminium oxide

Explanation: Aluminium Oxide or Alumina is present in small quantity in cement and it helps in a quick-setting property.

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