What is the principal strength-giving product formed during the hydration of Portland cement?
Correct answer: A. Calcium silicate hydrate gel
- A. Calcium silicate hydrate gel
- B. Calcium hydroxide crystals
- C. Calcium sulphate dihydrate
- D. Unhydrated clinker minerals
Explanation
Calcium silicate hydrate, commonly called C-S-H gel, forms the main binding structure in hydrated cement paste. Calcium hydroxide is also produced, but it contributes much less to strength.
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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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