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The percentage composition of alumina in Portland cement is ___________

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The percentage composition of alumina in Portland cement is ___________

(a) 60-69

(b) 17-25

(c) 3-8

(d) 2-4

I had been asked this question by my college director while I was bunking the class.

Enquiry is from Construction Material Cement topic in division Materials and their Properties of Engineering Chemistry I

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Right answer is (c) 3-8

The explanation is: The percentage composition of alumina in portland cement is 3-8 %. Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, the remainder consisting of aluminium and iron-containing clinker phases and other compounds.

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