The setting expansion of gypsum products can be reduced by________________?
Correct answer: C. Adding potassium sulfate
- A. Increased spatulation
- B. Less water powder ratio
- C. Adding potassium sulfate
- D. Allowing setting under water
Explanation
Potassium sulphate accelerates crystallisation but reduces the amount of setting expansion of gypsum. Increased spatulation and underwater setting generally increase expansion, while reducing the water-powder ratio does not provide the intended control here.
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