Discussion
Consider the following statements about blended cements.
1. Fly ash and slag both replace part of the clinker.
2. Blended cements generally gain strength more slowly at early ages.
3. Blending always reduces the durability of the concrete.
Answer: B
The first two are correct. The third is usually the reverse of the truth, since blended cements often give a denser paste and better resistance to chemical attack. The slower early gain is the real trade-off rather than durability.
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