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Answer :
Final answer:
The compressive strength of concrete designated for compression is greater than 3000 psi at 42 days.
Explanation:
The student's question is asking about the concrete which is designated by compressive strength that has a strength greater than a certain psi at 42 days. The ultimate compressive strength of concrete is given as 20 × 106 N/m². To convert this to psi (pounds per square inch), we have to multiply by a conversion factor which is approximately 145.038. This will give us a compressive strength of approximately 2900 psi. Hence, the correct option is b) 3000 psi. The concrete with designated compressive strength indeed has more than this value at 42 days.
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