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RE: Concrete Sounding

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"It seems like you should give the contractor the chance to try his method -
if it doesn't work pick another option."

That's the tricky part of testing: how do you know if it worked?  If you
have a condition that is not clearly visible and apparently supports the
daily service loads, but may not support the full design load or may
deteriorate a few years hence, how would you know?  The design team needs to
ask themselves what the consequences of failure are in this case.  If
missing some problem areas means collapse, then great care is called for.
If missing a few problem areas only means greater maintenance in the future,
perhaps the owner has a legitimate reason to make the cost/benefit analysis
of greater testing versus the chances of repair.  

Paul Crocker

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