What is the purpose of adding gypsum (calcium sulfate) during the final stage of cement production?
Correct answer: C. To control the setting time
- A. To add color to the cement
- B. To increase the strength of the concrete
- C. To control the setting time
- D. To act as a filler
Explanation
Gypsum is added to the cement clinker before the final grinding stage. It acts as a retarder, slowing down the hydration of the cement and preventing it from setting too quickly, which allows more time for transport and placement of the concrete.
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About Industrial Chemistry
Industrial chemistry applies chemical reactions and material properties to the manufacture of adhesives, dyes and polymers. Coverage includes addition and condensation polymerisation, thermoplastics and thermosetting polymers, the structural basis of colour in dyes, and how adhesive composition enables bonding between surfaces.
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