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Rebar designation - ca 1950

Rebar designation - ca 1950

Rebar designation - ca 1950

I'm trying to determine the characteristics of reinforcing steel from a building built around 1952.  I have a decent set of drawings, but the note designating the rebar is a little muddled. It looks like the call out is for "intermediate grade with deformations to conform to ASTM a-30E".  I'm not sure what "intermediate grade" would be for that time period.

RE: Rebar designation - ca 1950

Have you checked with CRSI?

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Rebar designation - ca 1950

I did and, so far haven't found anything on the "free" area.  It looks like the steel would have been under ASTM A-15 and most information I've gathered so far indicates "intermediate grade" would have had fy=40ksi.  I'll keep digging to verify.

RE: Rebar designation - ca 1950

I think the ASTM specification for the deformations should read A305.  And you are correct, intermediate grade would be 40 ksi yield.  This was the grade used until the early 60's, when it was gradually replaced by 60 ksi bars.

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