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Re: Concrete and rebar strength

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I think you should find f'c in experimental way (I meam follow the Dave's suggestions). In my country is common use this kind of concrete (1:2:4) and it have f'c=180 Kg/cm2 (2.5 Ksi).

Milton Veloz

I am adding loads to a building built in 1930. Amazingly, we have found the existing drawings and specs!
There is no compressive strength specified for the concrete. However, it specifies a concrete with 1 part cement, 2 parts sand and 4 parts aggregate. Can I tell from this info., what the 28 day compressive strength may be?

Also, the rebar is Federal spec. 350A, type B, any grade or class except structural grade. Can I tell from this info. what the particular yield strength is?
Jim K.

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