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Re: Fire Damaged Slab on Grade

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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

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 S. Wish, PE
California Professional Engineer
Structural Engineering Consultant


760.564.0884 (office - fax)

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