Discussion
State whether the following is true or false.
Blended cements typically gain strength more slowly at early ages than ordinary Portland cement.
Answer: B
Correct answer: True
Slag and fly ash react more slowly than clinker - the pozzolanic reaction needs the calcium hydroxide that clinker hydration must first release - so early strength is lower. Later strength is often higher, and the heat of hydration is lower throughout, which is why blended cements suit mass concrete particularly well.
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