What is the principal role of gypsum in ordinary Portland cement?
Correct answer: C. It controls the setting time of cement
- A. It prevents carbonation of concrete
- B. It increases the density of aggregates
- C. It controls the setting time of cement
- D. It provides most of the cement colour
Explanation
Gypsum is added to Portland cement to regulate the rapid reaction of tricalcium aluminate and prevent flash set. It does not act as an aggregate or provide the main source of cement strength.
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About Concrete Technology
Concrete technology covers cement, aggregates, water and admixtures, including their properties, proportioning and effect on fresh and hardened concrete. It explains workability, water-cement ratio, setting, hydration, strength, durability, curing, mix design and common defects, while distinguishing segregation and bleeding from general loss of workability.
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