>From: Gregg Seidl <firstname.lastname@example.org>
>Sent: May 29, 2008 12:33 PM
>Subject: [TowerTalk] Rebar
>Concrete will still CRACK with rebar in it but it won't seperate at the
>crack.The rebar will hold it together.Gregg K9KL
There are various standards for the maximum crack size where you would declare
that "failure" has occurred.
A quick google turns up a standard of 0.01" crack width for concrete pipe,
which has been determined (by experiment and analysis) will not allow
sufficient water and oxygen penetration to adversely affect the integrity of
the reinforcing steel.
Obviously, if you have a concrete structure with a 1" crack that still holding
together, it's basically failed (although, presumably in a failsafe or failsoft
sort of manner).
Somewhere in between, you'll have a failed structure that is structurally OK
today, but won't have the life or longevity in the future. That's the
situation where water infiltrates and causes corrosion of the rebar, then,
perhaps lightning induced spalling.
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