During the final milling stage of Portland cement manufacture, by weight of Gypsum is added to the clinker. What is the specific chemical function of this added Gypsum?

Question

During the final milling stage of Portland cement manufacture, $2-3\%$ by weight of Gypsum is added to the clinker. What is the specific chemical function of this added Gypsum?

Prashant Kotian · Accepted Answer

Correct answer: C. Tricalcium aluminate in cement reacts almost instantly with water, causing a premature hardening known as a "flash set". Gypsum is added specifically to retard (delay) this setting process, allowing the mixture to remain workable for pouring.

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