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Subject: Concrete Deck Tendon Repair

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sorry for the delay in responding on your follow-up...i went away for a few
days last week (unfortunately business not pleasure).

if there is a crack directly below and parallel to an unbonded tendon, and
the sheath is damaged, it is possible for the PT grease to "leak" out
through the crack. during a visual inspection, such locations are the first
signs of problems. they typically do not occur in the top surface, and are
more common in slabs.

for your case where the sheath is damaged ONLY, i would still peal back
sufficient sheath to reveal the full strand diameter. check for corrosion
anyway. you may have to remove a bit more concrete to get a good look. use a
screw driver to check the individual wires for breakage if there is indeed
visual corrosion. better to do it now and document, than to discover
corrosion repairs of PT during proposed repairs.

for repairs in the mainland US, Structural Preservation Systems from
Baltimore (also now VSL) have undertaken some of the most extensive unbonded
PT in the country. they do not have an office in Ca,, but they have a good
guideline publication they will send you. see their web site-

HTH mark


Mark Geoghegan BE (Hons.-Structural)

S T R U C T U R A L   T E C H

>Will you please explain what cracks you mean when you say "grease leaks
> through cracks."
> I appreciate your input.
> Sharon Robertson Bonds, PE
> Salerno/Livingston Architects
> 363 Fifth Avenue, Third Floor
> San Diego, California  92101
> (619) 234-7471

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