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Grade refers to the strength of cement at 28 days, when tested as per IS: 4031-1988. If the 28 days strength is less than 33 N/mm2, it is called 33 Grade Cement. If the 28 days strength is lies between 33 to 43 N/mm2, it is called 43 Grade Cement. If the 28 days strength is lies between 43 to 53 N/mm2, it is called 53 Grade Cement.

The answer is to be modified as below:

If the average compressive strength of cement ( cement mortar 1:3 cube of 50 cm2 face area) at 28 days is between 33 to 43 N/mm2 it is classified as 33 grade cement; if it is between 43 to 53 N/mm2 as 43 grade cement; and if it is above 53 N/mm2 as 53 grade cement.

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