Discussion
Clinker is cooled rapidly rather than slowly because slow cooling would
Answer: A
Correct answer: let the desired compounds decompose
Tricalcium silicate is unstable below about 1250 °C and reverts slowly to dicalcium silicate and free lime if the clinker is allowed to cool through that range at leisure. Rapid cooling freezes it in as a metastable phase. Since tricalcium silicate is what gives the early strength, quenching the clinker is not a convenience but a requirement.
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