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RE: Fire Damaged Slab on Grade

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This is a common concrete investigation method that's been recognized
forever in the concrete repair world.  Probably even an ASTM spec on it.

Bobber

-----Original Message-----
From: Padmanabhan Rajendran [mailto:rakamaka(--nospam--at)yahoo.com] 
Sent: Tuesday, March 08, 2005 9:48 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Fire Damaged Slab on Grade

Just to set the record straight, the chain trick was
first brought to the notice of this list by Harold
Sprague. It was about four years ago.

Rajendran

--- "Dennis S. Wish, PE" <dennis.wish(--nospam--at)verizon.net>
wrote:
> Garner, Robert wrote:
> 
> >I would recommend you drag a heavy chain across the
> slab to reveal any
> >delamination from heat expanded aggregate.  The
> chain will "ring" on good
> >concrete and have a dull sound where there is
> delamination.  Simple and very
> >effective.
> >
> >Bob Garner, S.E.
> >
> >  
> >
> Gosh, I love this one. Thanks Bob - I think it is
> really neat to learn 
> little tricks like this. Years ago, Ben Schmidt use
> to push a nail into 
> the bed and head joints of masonry walls to
> determine if the strength of 
> the mortar bond was strong enough or needed cleaning
> and pointing. I 
> used a key and did a light scrape.
> I also tap paver tiles and if one sounds hollow it
> means that the bottom 
> was not buttered and that there is a chance the tile
> will crack in time 
> so avoid putting anything of weight on it.
> Great tip - thanks again.
> Dennis
> 
> -- 
> 
> *Dennis S. Wish, PE*
> *California Professional Engineer
> Structural Engineering Consultant
> 
> dennis.wish(--nospam--at)verizon.net*
> *
> 760.564.0884 (office - fax)
> *
> 
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