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How does the strength of concrete differ with age of concrete?

(a) Increases

(b) Decreases

(c) No effect

(d) Increases, then decreases

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The correct answer is (a) Increases

Explanation: It increases with increase in age.  The strength measured after days, months and years shows an increase. It takes 28 days for concrete to attain full strength.  However, it continues to attain strength even after 28 days.

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