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Re: Repair of reinforced concrete members.

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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.