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RE: Concrete Assessment after Fire

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There are resources for fire damaged concrete, but I can't recall any on a slab on grade foundation.  A slab on grade foundation is generally considered as unreinforced concrete. 
I would power wash the concrete.  Do a chain drag to detect delaminations and spalling.  Look at the color.  The first color change that indicates a measure of degradation is pink.  You can do local spot repairs for small delaminations and spalling.  You can epoxy inject any cracking. 
You might also want to check for flatness using a straight edge and the ACI 117 as a bench mark for acceptance. 

Harold Sprague

> Date: Fri, 23 May 2008 09:58:05 -0700
> From: chris(--nospam--at)
> To: seaint(--nospam--at)
> Subject: Concrete Assessment after Fire
> I'm working with a client whose home recently caught fire. A good
> part of the structure is still intact, though badly burned. There's a
> stairway in the home that is built of tube steel with concrete treads.
> The fire got so hot that the weight of the treads caused the tube
> steel to bend down significantly.
> The client is discussing the way forward with his insurance company
> and one question he has is about the integrity of the existing slab
> foundation. The house was built in the 60's, so it's unclear what
> sort of reinforcement is in the slab. From the top, there's no visual
> clues as to the condition. It's black in places, but seems intact.
> So here's my questions:
> - Are there some good resources out there where I can learn about
> concrete performance after a fire?
> - Does anyone know of a company in Northern California (the home is in
> Davis) that can do post-fire concrete assessment?
> Thanks in advance,
> Chris
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