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Re: Concrete and rebar strength

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My recommendation would be to pull 4 to 6 cores from inocuous places and
have them tested in compression in accordance with ASTM C 42.  You should
locate steel with a pachometer prior to coring to ensure that your cores are
steel free.  I seem to recall that ACI has some recommendations for
determining f'c from cores taken from an existing building.  Sorry I can''t
help with the steel side.

Dave Woodham
Atkinson-Noland & Assoc.

From: "Kestner, James W." <jkestner(--nospam--at)>

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?

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