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Why Gypsum is Added to Cement?

Portland cement is hydraulic cement. This means that it sets and hardens faster due to a chemical reaction with water. As a result, it will also harden under water. Whenever water is mixed with cement, a smooth paste is formed that remains plastic for a short time. During this period, the paste can be disturbed […]

Cement Making Process

The raw materials used for the manufacture of Portland cement are limestone CaCO3 and clay which are finely powdered and then mixed in the ratio 3 : 1 by mass. The mixture is again ground to a fine powder and water is added. The finely ground powder called slurry is heated to 1450-1500°C in a rotary kiln. At […]