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Testing Old Concrete

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Fellow engineers,

        I have encountered a problem with some old concrete in foundation 
walls.  The concrete is from about 1912.  The aggregate contains 1" to 1 
1/2" smooth river rock; no crushed aggregate.  Four cores were taken for 
testing; three of the four crumbled on removal; the testing company say 
that this is not uncommon for concrete of this age even though the concrete 
 is otherwise sound.

        The intent is to reuse the foundation which appears to be in 
excellent condition; the allowable soil bearing pressure is in  excess of 
7,000 p.s.f.  The new loading will come from W6x15.5 columns connected to 
the foundation walls with long vertical clip angles connected to the walls 
with 3/4" HILTI epoxy anchors and welded to the columns.  There is no 
seismic loading in Calgary (actually, it's Zone 1, after several decades of 
 being Zone 0).

        Load testing of a sample connection can be done.  Also, Schmidt 
Hammer testing can be done.  The first is expensive; the second may not be 
as reliable as desired.  Can anyone recommend any other testing?

        It is now Friday and I would like to be prepared to discuss this 
with the testing company Monday or Tuesday.

Thank you for any help you can provide.

Regards,

Daryl

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