It is a fine powder, produced by heating limestone and clay minerals in a kiln to form clinker, grinding the clinker, and adding 2 to 3 percent of gypsum. Several types of Portland cement are available. The most common, called Ordinary Portland Cement (OPC). OPC is the most commonly used cement worldwide. They are widely used for the construction of high-rise buildings, roads, dams, bridges, fly overs. Also, Ordinary Portland Cement is used for making grouts and mortars