Discussion
The grey colour of ordinary Portland cement is due chiefly to its content of
Answer: B
Correct answer: iron compounds
The grey colour comes from the iron-bearing phase, chiefly tetracalcium aluminoferrite. White Portland cement is made from raw materials chosen to be very low in iron and manganese, which is why it is more expensive: the limestone and clay must be selected, and the fuel and grinding media must not contaminate the mix.
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