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Re: Testing Old Concrete

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I'd use the Schmidt, show the bearing pressure on the pedestal will be far 
below the estimate, and call it good.

William L. Polhemus, Jr. P.E.


On Aug 16, 2013, at 7:47 PM, "h.d.richardson(--nospam--at)" 
<h.d.richardson(--nospam--at)> wrote:

> 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?

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