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Were #11 rebar manufactured in only Grade 60 in the early 80's?

Were #11 rebar manufactured in only Grade 60 in the early 80's?

Were #11 rebar manufactured in only Grade 60 in the early 80's?

(OP)
Hi all,

I'm looking into an existing concrete shear wall building designed in 1982 for a retrofit. The general notes state that the wall dowels to footings are Grade 40. Looking at the shear wall sections, the majority of them are #11's. My question is, even though the plans specify Grade 40, is it possible that #11's were only manufactured Grade 60 back in the 80's?

RE: Were #11 rebar manufactured in only Grade 60 in the early 80's?

They were not only in grade 60 in 82. My guess would be that the #11 are 60.

Link

RE: Were #11 rebar manufactured in only Grade 60 in the early 80's?

(OP)
This is perfect. Thank you! It looks like the standard was changed in '81 and the building was constructed in '82/'83. The timing is so close that I would still have to assume the rebar could have been sitting in storage and used in this project, but it answers my question.

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