[TowerTalk] Fwd: Screw Anchor Experience

[Mark Robinson]

I have copper clad ground rods near the guy anchors and the copper is going 
to want to strip the galvanising away as well..


73 Mark N1UK


----- Original Message ----- 
From: "K0DAN" <k0dan at comcast.net>
To: <towertalk at contesting.com>; "Hans Hammarquist" <hanslg at aol.com>
Sent: Thursday, 20 June, 2013 1:43 PM
Subject: Re: [TowerTalk] Fwd: Screw Anchor Experience


> Hans...
>
> In my experience this is not true. I have some photos of my failed 
> galvanized screw anchor which I can send you. The failure was a good 3+ 
> feet below the ground surface, however I expect the metal rod was probably 
> compromised along its entire length.
>
> The property I am on was once a working farm. I occasionally find gears 
> and other metal parts from farm implements I believe to date from the 
> 1920's-1930's. This iron or steel parts are very solid and heavily rusted, 
> and the rust protects it from deeper corrosion (think: ocean 
> liner)...galvanized anchors, on the other hand, are not the same compound. 
> (Metallurgists please chime in). I suspect that the steel underneath the 
> galvanizing may be a very soft/cheap material (keep the costs down no 
> matter what), and once the galvanizing is compromised it does not take 
> long (15 years in my case) for the actual metal to be totally compromised.
>
> What you describe for poles, fence posts, etc., is true, but I suspect we 
> are comparing apples and oranges. And again, we should not assume that all 
> soils are created the same. What I have here in west central Missouri is 
> probably much different than soils and ground water in other parts of the 
> country.
>