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Posted by RicodJour on May 17, 2009, 9:11 pm
> On Sun, 17 May 2009 20:33:40 -0400, "norm...@earthlink.net"
> >Big problem in Florida - lots of buildings with balconies have had to
> >rework the concrete. =A0Rebar rusted, expanded and cracked the concrete.
> Haven't they been using rebar for 50 or 100 years? =A0Did something
> change so that it rusts now?
No, you've been sleeping or in a coma. It's always rusted.
R
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Posted by norminn@earthlink.net on May 18, 2009, 7:29 am
mm wrote:
> On Sun, 17 May 2009 20:33:40 -0400, "norminn@earthlink.net"
>
>> Big problem in Florida - lots of buildings with balconies have had to
>> rework the concrete. Rebar rusted, expanded and cracked the concrete.
>
> Haven't they been using rebar for 50 or 100 years? Did something
> change so that it rusts now?
>
Perhaps the problem in Florida is with buildings not kept adequately
painted, so there is more salt intrusion. Don't know the reasons.
>
>> Some problems with the issue in our condo, but nothing structural.
>> Building down the street, about 12 storey, had a great deal of work done
>> for the problem.
>
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Posted by Stormin Mormon on May 18, 2009, 9:52 am
New Obama law, maybe. The Rusting of Rebar Act of 2009.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
On Sun, 17 May 2009 20:33:40 -0400, "norminn@earthlink.net"
>Big problem in Florida - lots of buildings with balconies
>have had to
>rework the concrete. Rebar rusted, expanded and cracked
>the concrete.
Haven't they been using rebar for 50 or 100 years? Did
something
change so that it rusts now?
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Posted by RicodJour on May 17, 2009, 9:26 pm
On May 17, 8:00=A0pm, spamb...@milmac.com (Doug Miller) wrote:
> How are they going to get bigger while they're encased in concrete?
It really surprises me that you have such problems understanding
this. Your personal observation of those funky brown stains on
concrete structures everywhere should indicate that something is
rusting. If you can't see what's rusting, and are keen enough to
realize that rust doesn't just magically appear on concrete, you'll
probably latch on that the rust is coming from inside the concrete.
In a nutshell. Concrete is not waterproof. It wicks up moisture.
The steel doesn't care that it is encased in concrete and will rust in
the presence of the H2O. Concrete sucks in tension - something on the
order of 1/10 its strength in compression. Constant tension on
concrete leads to cracking. Cracking allows in more moisture, and the
cycle continues until the structure falls apart.
Please, DAG. There's a hole in your education.
R
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Posted by Doug Miller on May 18, 2009, 7:57 am
>On May 17, 8:00=A0pm, spamb...@milmac.com (Doug Miller) wrote:
>> How are they going to get bigger while they're encased in concrete?
>It really surprises me that you have such problems understanding
>this. Your personal observation of those funky brown stains on
>concrete structures everywhere should indicate that something is
>rusting. If you can't see what's rusting, and are keen enough to
>realize that rust doesn't just magically appear on concrete, you'll
>probably latch on that the rust is coming from inside the concrete.
>In a nutshell. Concrete is not waterproof. It wicks up moisture.
>The steel doesn't care that it is encased in concrete and will rust in
>the presence of the H2O. Concrete sucks in tension - something on the
>order of 1/10 its strength in compression. Constant tension on
>concrete leads to cracking. Cracking allows in more moisture, and the
>cycle continues until the structure falls apart.
I guess all those engineers who've been building things with steel-reinforced
concrete for all these years must be completely ignorant, huh?
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