The mix becomes harden and stronger with age. This strength development is significant in the first month but it does not continue at a much slower rate for many years is called HYDRATION of cement and is accompanied by generation of heat which is called of hydration OF CEMENTSelection of Ordinary Portland Cement (OPC) depends on the consumer.For a consumer it is important to look out for the following :SOURCE/MANUFADTURER OR BRAND OF OPCIt is very important to procure OPC from a reliable source as there are good chances that the material could be adulterated.It is important to procure OPC of a reliable brand are very constant in their quality or in other words they market consistently good quality OPC which is more reliable in its performance and large variations in the properties can easily be ruled out.GRADE OR STRENGTH OF OPCThe grade of OPC is clearly printed on the cement bags,53 grade cement is the highest grade of cement produced in the country. The other lower grades available are either 43 grade or 33 grade.The requirement of properties of all these cements are given in the folloeing Indian Standards IS : 12269 1987 (53grade), IS : 269 1989 (33 grade).
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