Discussion
Assertion (A): Concrete is mixed with considerably more water than hydration strictly requires.
Reason (R): A paste containing only the chemically necessary water would be far too stiff to place.
Answer: C
Both are true and the reason gives the compromise: workability demands water that the chemistry does not need, and the surplus leaves the capillary pores that limit strength and durability. Every litre beyond the chemical requirement leaves pores behind.
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