Discussion
Which of the following properties of concrete facilitates high durability of concrete?
Answer: B
A low water/cement ratio gives a dense concrete of low permeability, so water and aggressive chemicals cannot penetrate easily, which makes the concrete durable. High early strength does not itself make it durable, flaky aggregates give a poor, harder to compact mix and more voids, and high permeability is the opposite of what durability needs, since it lets water and harmful agents in.
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