Gypsum
Calcium chloride
Calcium carbonate
None of the above
Answer is Wrong!
Answer is Right!
The correct answer is A. Gypsum.
Gypsum is the most commonly used retarder in cement. It is a white, powdery mineral that is added to cement to slow down the setting time. This allows for more time to place and finish the concrete before it hardens. Gypsum also helps to improve the workability of the concrete and reduce shrinkage.
Calcium chloride is a white, crystalline salt that is sometimes used as a retarder in cement. However, it is not as effective as gypsum and can cause the concrete to become more
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