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- Ordinary Portland cement (OPC) is the most important type of cement.
- The OPC was classified into three grades, namely 33 grade, 43 grade and53 grade depending upon the strength of the cement at 28 days when tested as per IS 4031-1988. If the 28 days strength is not less than 33N/mm2, it is called 33 grade cement, if the strength is not less than 43N/mm2, it is called 43 grade cement, and if the strength is not less than 53 N/mm2, it is called 53 grade cement.
- But the actual strength obtained by these cements at the factory are much higher than the specifications.
- The manufacture of OPC is decreasing all over the world in view of the popularity of blended cement on account of lower energy consumption, environmental pollution, economic and other technical reasons.
- In the years to come the use of OPC may still come down, but all the same the OPC will remain as an important type for general construction.
