Cement is made from limestone and clay in powder form. The manufacturing of cement started in 1904 in India. Portland Cement is generally referred to as Ordinary Portland Cement (OPC) in our country.
Ingredients of cement
The main ingredients used in cement manufacturing are lime, silica, alumina, and other oxides. A brief discussion about the contribution of different ingredients in cement is below:
Lime
About 60 - 65 % of cement constitutes of lime which contributes to the strength. Proper care should be taken in proportion to make the cement sound and strong, as an excess of lime makes the cement unsound and causes the cement to expand and disintegrate. In case, if lime is deficient, the strength of the cement is reduced and sets quickly.
