During the final milling stage of Portland cement manufacture, by weight of Gypsum is added to the c — s Block Elements Chemistry Question
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?
Answer: C
💡 Solution & Explanation
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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