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Re: Scanning for reinforcing

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Your wires are rather small and closely spaced which makes this a difficult problem.  If the wires are close to the surface you may have luck locating them with a Pachometer otherwise you would need to use radar mapping.  For determining the corrosion level in rebar you can use ASTM C876, "Half-Cell Potentials of Uncoated Reinforcing Steel in Concrete" however I am not sure it works for pre-stressing strands.  I do not think you will find a test to determine the diameter of your wires other than taking core samples.

This is one of those problems that is probably best handled by a specialist such as CTL (Construction Technology Laboratories) or WJE (Wiss, Janney, Elstner Associates).  I have used them both and they are very helpful.  Try giving them a call.

Thomas Hunt, S.E.
ABS Consulting

"Wayne E. Beckingham" <wbeckingham(--nospam--at)>

11/08/2002 09:31 AM
Please respond to seaint

        To:        <seaint(--nospam--at)>
        Subject:        Scanning for reinforcing

I have a project in which the floor system is cast gypsum slurry reinforced
with draped wire stands supported by a steel beam grid.  The wire strands
are 2 twisted No. 12 wires at some spacing (1" to 3" on-center).  The slabs
have been exposed to water from a leaking roof.  I know that many of the
wire stands in the water damaged areas have significantly rusted.

I am looking for advise on a non-destructive and economical testing method
that will help determine the extent of damage.  I am looking for rusted wire
strands.  Does anyone have information of a testing method that will
accurately determine area of steel (or diameter) for small wires at a tight
spacing?  Any help would be appreciated.

Wayne Beckingham, P.E.