


How Cement Is Made - Manufacturing of Cement By Dry and Wet Process
The chemical process for hydraulic cement was found by ancient Romans who used volcanic ash ( pozzolana) with added lime (calcium oxide). Non-hydraulic cement (less common) does not set in wet conditions or under water. Rather, …Portland cement itself is a complex material, manufactured by first burning an intimate mixture of limestone and clay or shale in a kiln at temperatures in the range of 1400°C–1500°C, and then intergrinding the resulting clinker with a small amount of gypsum.
