by adding gypsum to cement
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Answer:Gypsum is often added to cement and concrete to slow down the drying time. Cement dries quickly and retarding that process allows workers to pour the mixture into the various forms or frames needed. Gypsum is a naturally occurring mineral mined from deposits formed by ancient seabeds as a raw material.
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Gypsum is added to cement to slow down the hydration process of cement once it mixes with water.
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