[TowerTalk] Rebar Centering, Rebar Rusting, Foundation Failure, ETC.

Richard M. Gillingham rmoodyg at bellsouth.net
Thu Oct 12 20:13:44 EDT 2006

Also, they don't contact the rebar cage.

They are (or should be) encased in grout.  At least that's what USTs 
installation instructions and the PE's drawings show.

Good luck,
Gil, W1RG
----- Original Message ----- 
From: "Rick Karlquist" <richard at karlquist.com>
To: "Allan W Schlaugat" <reflectors at n9isn.com>
Cc: "Michael Baker" <k7ddmjb at qwest.net>; <towertalk at contesting.com>
Sent: Thursday, October 12, 2006 8:08 PM
Subject: Re: [TowerTalk] Rebar Centering, Rebar Rusting, Foundation Failure, 

> One thing that has always baffled me is:
> If it is so important that rebar does not come within
> 3 inches of the concrete to earth interface, then why
> is it OK for the anchor bolts to stick up out of the
> concrete?
> Possible answers:
> 1.  They penetrate a concrete to air interface.
> In that case you can simply let a few of the rebar
> cage vertical bars stick up out of the concrete
> so you can grab on to them to keep the cage centered.
> 2.  They are galvanized.  However, UST ships non
> galvanized anchor bolts, so I guess it isn't 2.
> 3.  Rebar rusts easier than bolts.  Probably not.
> Anyone have the correct answer?
> Rick N6RK
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