Most commonly used retarder in gypsum_____________?
Correct answer: A. Citrales
- A. Citrales
- B. Nacl
- C. Na2 So4
- D. K2 So4
Explanation
Citrate salts, especially potassium or sodium citrate, are commonly used retarders for gypsum. Sodium sulphate and potassium sulphate are associated mainly with acceleration, not retardation.
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