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RE: Fire Damaged Slab on Grade

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if we are going to do this right, we have to set up
some standards--length of chain, size of links,
weight, speed of dragging, grid pattern and so on :-)
Gary

On 8 Mar 2005 at 11:22, Garner, Robert wrote:

> 
> We're currently doing a bunch of pier inspections for the Navy
> including chain dragging all the pier decks.  The sound difference
> between good and bad concrete is remarkably clear.  Ya gotta try it,
> it really works. I find that striking the concrete with a hammer is
> not as clear as the chain method.
> 
> Bo
> 
> -----Original Message-----
> From: Bill Polhemus [mailto:bill(--nospam--at)polhemus.cc] 
> Sent: Tuesday, March 08, 2005 11:09 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Fire Damaged Slab on Grade
> 
> David Fisher wrote:
> 
> >To be honest, the "chain drag" method goes back so far I seriously
> doubt
> >anyone would be willing to take credit for it...
> >  
> >
> The problem I have always had with this method is that it seems like
> it would take "a while" to calibrate. That is, if I've never done it
> before, I'd need to get comfortable with the sound of "good" vs. "bad"
> concrete.
> 
> It's probably just me. I have a hard time finding the location of wall
> studs using a hammer. Kinda strange for someone who otherwise has a
> good
> 
> musical ear, and can sing a passable baritone.
> 
> -- 
> Bill Polhemus, P.E.
> Polhemus Engineering Company
> http://www.polhemus.cc/
> 
> 
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