Discussion
A raw mix analysis gives 65 per cent lime, 22 per cent silica, 6 per cent alumina and 3 per cent iron oxide. What is the total of these four oxides?
Answer: C
Adding 65, 22, 6 and 3 gives 96 per cent, the remainder being magnesia, alkalis, sulphate and loss on ignition. The four principal oxides account for nearly all of a Portland cement. The balance among them decides which clinker phases form.
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