Sorry, but that's an old wives tale. Concrete itself is porous as hell
and will pass moisture almost as easily as any cinder block. There is no
way on this earth that concrete will keep moisture away from the iron,
but the alkalinity of the concrete will indeed keep the iron from
rusting and that's why our bridges hold together and our towers don't
fall over.
73,
Dave AB7E
p.s. The specs for my tower called for 16 yards of concrete (9' by 9'
by 5' deep), but it was impossible to carve a hole with straight sides
into this rocky hillside so I ended up with over 20 yards myself.
On 9/16/2012 4:02 PM, Edwin Karl wrote:
Do NOT use cinder blocks or red brick to support iron for the pour
Use concrete material, block pieces, curb stop etc. The purpose
is to keep moisture away from the iron. Cinder and red brick pass the
moisture through.
At least that's what we were told in the before time when I worked
as an iron worker.
I have an HD-90, it's a tough tower. The base got away from me
and we used 22 yds of concrete. It ain't going nowhere.
73
ed K0KL
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