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Problem 1: The engineer’s specified strength for a concrete is 4000 psi. The concrete needs to...

Problem 1:
The engineer’s specified strength for a concrete is 4000 psi.
The concrete needs to be designed for freeze/thaw durability classification F1.
The concrete needs to be designed for sulfate durability classification S0.
The ready mix supplier cannot furnish test records of a similar strength class of concrete.
Determine the required average strength of delivered concrete, f’cr.

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