Answer by Rakshita Nagayach:
Grade 53 implies that cement attains a compressive strength of 53 N/mm^2 after a curing period of 28 days.
According to, "Ordinary Portland cement, 53 grade shall be manufactured by intimately mixing together calcareous and argillaceous and/or other silica, alumina or iron oxide bearing materials, burning them at a clinkering temperature and grinding the resultant clinker so as to produce a cement capable of complying with this standard. "
The ratio of the raw material required is given below in the table.
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