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rebar from 1971

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Does anyone have any documentation to verify the most likely grade of rebar
used for a job that was built in Canada in 1971. I have a CRSI manual that
suggests that ACI-1971 was based mostly upon grade 60(ksi). Is this likely
to be the case??

David Handy, P.Eng.
The Thompson Rosemount Group, Cornwall, Ont. Canada
Opinions expressed are personal only.