Discussion
Consider the following statements about clinker substitution.
1. Fly ash availability depends on coal-fired power generation.
2. Calcined clay is more widely available than slag or fly ash.
3. Substitution has no effect on the early strength of the cement.
Answer: A
The first two are correct. The third is wrong in almost every case, since substituted materials react more slowly than clinker and early strength is the usual casualty. Later strength often exceeds that of the plain cement, however.
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