If it truly is the case that there is little or no oxygen in the concrete,
why do they tell you to make sure the rebar is competely within the
concrete? If it sticks out, it would only rust/corrode where metal is
in contact with the soil.
73 Barry
On 17 Sep 99, EUGENE SMAR wrote:
>
> TT:
>
> Regarding "bitumastic" on tower sections in concrete, I'd recommend
> applying the material to only the top six inches or so within the concrete,
> continuing the coating out of the concrete to six inches above the
> foundation. This will provide corrosion protection to the tower legs
> against standing water (from accumulated snow, rain puddles, etc.) on the
> concrete pad. Covering up the deeply embedded tower does little to prevent
> corrosion (no or little oxygen in the concrete). You also lose some
> serendipitous grounding (unintentional Ufer ground) when you insulate the
> tower from the conductive concrete mixture. (This is not my idea - credit
> goes to N3RR who gave me an education at his tower farm last year.)
>
> 73 de
> Gene Smar AD3F
> -----Original Message-----
> From: K7LXC@aol.com <K7LXC@aol.com>
> To: b4e@earthlink.net <b4e@earthlink.net>; w2xx@cloud9.net
> <w2xx@cloud9.net>; geoiii@kkn.net <geoiii@kkn.net>; towertalk@contesting.com
> <towertalk@contesting.com>
To: <towertalk@contesting.com>
> Date: Friday, September 17, 1999 10:32 AM
> Subject: Re: [TowerTalk] Guy anchors
>
>
> >
> >In a message dated 99-09-17 09:47:48 EDT, b4e@earthlink.net writes:
> >
> >> Does it matter if the tar is on the rod into the concrete?
> >>
> > Nope, actually a good idea. The same for base sections sunk in
> concrete.
> >
> > BTW the only Rohn anchor rod failure I've ever seen was at the high,
> >exposed site of W6NL. It was a severely overloaded tower and the winds up
> >there are brutal. It was a commercial tower, not one of Dave's.
> >
> >Cheers, Steve K7LXC
> >Champion Radio Products
> >
> >--
> >FAQ on WWW: http://www.contesting.com/towertalkfaq.html
> >Submissions: towertalk@contesting.com
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> >Problems: owner-towertalk@contesting.com
> >Search: http://www.contesting.com/km9p/search.htm
> >
>
>
> --
> FAQ on WWW: http://www.contesting.com/towertalkfaq.html
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>
--
Barry Kutner, W2UP Internet: w2up@mindspring.com
Newtown, PA FRC alternate: barry@w2up.wells.com
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
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