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Re: Fire Damaged Slab on Grade

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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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