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Re: Repair of reinforced concrete members.[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaoc '" <seaoc(--nospam--at)seaoc.org>
- Subject: Re: Repair of reinforced concrete members.
- From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
- Date: Tue, 7 Oct 1997 07:25:00 -0500
With proper equipment, training, and experience and experience and experience ultrasound testing is a good way to go. But for the normal routine concrete repair I'd prefer a hammer, chain, and can of paint. I have had applications where I have specified ultrasound, but my specifications for the testing agency are very tight. As a matter of fact I believe that I listed only 2 testing firms that would be able to provide these services. I have heard of the horror stories of ultrasound misapplication, and I won't get into them here. I am fortunate that phone calls to some colleagues prevented a recurrence on any of my projects. Regards, Harold Sprague ---------- From: Arvel L. Williams, P.E. To: seaoc(--nospam--at)seaoc.org Subject: Re: Repair of reinforced concrete members. Date: Tuesday, October 07, 1997 12:32AM 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. > http://www.lcm.com Gentlemen: Any opinions on using Ultrasound transmission for qualitative evaluation of repairs. Arvel L. Williams, P.E
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