Cement is by far the most important constituent of concrete, in that it forms the binding medium for the discrete ingredients. Made out of naturally occurring raw materials and sometimes blended or interground with industrial wastes, cements come in various types and chemical compositions for general concrete constructions, the IS:456 permits the use of the following types of cement subject to the approval of the engineer- in- charge:
A. Ordinary Portland cement (OPC) 33 Grade (IS 269: 1989)
B. Ordinary Portland cement (OPC) 43 Grade (IS 8112:198)
C. Ordinary Portland cement (OPC) 53 grade (IS 12269: 1987)
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