Cement is one of the oldest building materials in the world. For centuries, cement has been essential to building long-lasting homes, modern offices and public infrastructure. It is manufactured through a large-scale, capital-and energy-intensive process. Production of cement begins in a rotary kiln in which limestone and clay are heated to approximately 1,450 degrees Celsius. Under these extreme conditions, a semi-finished product called clinker is then formed. Different high-grade additives then produce the different kinds of cement. Lafarge Cement Zimbabwe has three flagship products.