Discussion
The two essential raw materials for Portland cement are
Answer: A
Correct answer: a calcareous and an argillaceous material
Portland cement needs a source of lime and a source of silica, alumina and iron. The calcareous material - limestone, chalk or marl - supplies the lime, and the argillaceous material - clay or shale - supplies the rest. Everything else, including the gypsum, is a minor addition, and the whole chemistry of the clinker follows from the proportions in which these two are blended.
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