Cement is nothing but a binder. It will harden itself or bind together with other materials. There are cements which harden continuously because of exposure to the water content. Portland cement will harden because of hydration and chemical reactions that take place because of the presence of moisture. In order to retain strength, non-hydraulic cements such as lime and gypsum plaster are used.
They should be kept dry so that they will retain strength without any issue. Portland cement is available in different grades. The selection of the cement should be done based on its compression strength. High grade cement is used in the construction of residential as well as commercial buildings.
CHEMICAL Composition of CEMENT
60% to 70% – LIME (CaO)
20% to 25% – SILICA (SiO2)
5% to 10% – ALUMINIA (Al2O3)
2% to 3% – FERRIC OXIDE (Fe2O3)
What is 43 Grade CEMENT?
Ordinary Portland cement (OPC) is available in grades such as 33, 43 and 53. The compression strength of cement concrete after 28 days of setting will be measured to certify the cement grade. If you go for 43 grade cement, you will get compression strength of 43 mpa (mega pascals) in 28 days. 43 grade cement is used in general civil engineering construction work. Plastering, pointing, flooring, brick masonry and RCC work will be done very efficiently with 43 grade cement. The design strength of 43 grade cement will be of the order of 430 kg/sq cm.
The drawback with 43 grade cement is that it will attain strength slowly. However, it will attain the same strength that is attained with 53 grade cement after sometime. The hydration process in 43 grade cement will be slow. The heat release will be very less. Proper care should be taken to avoid micro-cracking. Ordinary and small scale consumers can go for 33 grade of cement also as per their needs.
What is 53 Grade CEMENT?
If you go for 53 grade cement, you will get compression strength of 53 mpa (mega pascals) in 28 days. 53 grade cement is available in ordinary mode as well as in special mode. If the initial strength is to be achieved very quickly, it is required to go for 53 grade cement. The construction pace will be very fast with 53 grade cement.
It is used for fast setting. The strength attained in 7 days will be 27 mpa with 53 grade whereas the strength attained with 43 grade will be just 23 mpa in 7 days. The initial higher strength is the criteria with 53 grade OPC and it is commonly used for plastering works. It is used in RCC and pre-stressed concrete of higher grades. The cost of 53 grade cement is higher than 43 grade cement and it will be of the order of 2% to 3%.