Discussion
Assertion (A): Durability specifications often set a maximum water to cement ratio rather than a minimum strength.
Reason (R): Permeability governs the ingress of aggressive substances more directly than strength does.
Answer: D
Both are true and the reason gives the logic: strength and permeability are related but not identical, and it is the transport of chloride, sulphate and carbon dioxide into the concrete that actually causes the deterioration.
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