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RE: Fire Damaged Slab on Grade

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The chain we're using has 3" long links, 3/8" diameter material.  The
length is about 6 ft. but that's more than you need.  Use a side to side
sweeping motion and when you get "the sound", just sort of "dance" the
chain around to define the boundaries of the delamination.  Actually,
this ain't a bad way to make a living.

Bob Garner, S.E.

-----Original Message-----
From: Jim Wilson [mailto:wilsonengineers(--nospam--at)yahoo.com] 
Sent: Tuesday, March 08, 2005 11:25 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Fire Damaged Slab on Grade

Is there a certain size "heavy" chain that works
better than others?

I can "calibrate" mine in my garage where I can find
the hollow spots just by walking over them.

Jim Wilson, PE
Stroudsburg, PA


--- Bill Polhemus <bill(--nospam--at)polhemus.cc> wrote:
> 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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