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[SEAOC] rebar costs

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     During a structural observation today the concrete contractor told me
the differece in cost between 40 and 60ksi rebar is $5.00 per ton ( 1400 feet
of number 4 bar ).
     Is this correct? If so, why even bother with 40 ksi rebar as is common
with number 3 and 4 rebar ? The contractor said lately local suppliers had
60ksi readily available in the smaller sizes. The application today was a
non-structural slab on grade with number 3 rebar at 18" O.C..
     I would value your thoughts.

Tom Harris, SE
Thousand Oaks, CA