The function of gypsum addition during cement making is to_________________?
Correct answer: B. Decrease the cement setting rate
- A. Increase the density of cement
- B. Decrease the cement setting rate
- C. Both A. and B.
- D. Neither A. nor B.
Explanation
Gypsum reacts with the aluminate phases in cement and slows their rapid hydration, giving cement workable setting time. It therefore decreases the setting rate rather than increasing density.
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