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Re: Repair of reinforced concrete members.

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Lew Midlam wrote:

> Sprague, Harold O. wrote:
> >
> >... <snip>...
> > the patch tended to delaminate from the parent concrete as a
> > unit.  Sounding with a hammer easily revealed the lack of a proper
> > bond between the patch and the parent concrete.
> This is often the result of not excavating deep enough.  If the bar
> isn't *fully* excavated then an anode/cathode system develops between
> the upper and lower surfaces of the bar.  Corrosion is very rapid, and
> delamination occurs at the bond between the new and old concrete.
> > I would strongly advocate
> > periodic inspections to repaired structures to monitor performance.
> >
> 100% agreement here.  The fisrt repair is just that - the *first* of
> what is usually many during the remaining life of the structure.
> Lew Midlam, P.E.


Any opinions on using Ultrasound transmission for qualitative evaluation
of repairs.

Arvel L. Williams, P.E