Ed:
My standard specifications allow for the stripping of forms from elevated
beams, slabs and columns after 14 days. This is fairly typical in the industry.
The caveat is that the full live loading is not to be applied until after 28
days and the system will only be subjected to its own dead load plus minimal
construction live loading.
Regards
Lonberg Design Group, Ltd.
H. Lonberg, P.E.,S.E.
President
----- Original Message -----
From: "Ed K0KL" <cny99676@centurytel.net>
To: towertalk@contesting.com
Sent: Wednesday, October 27, 2010 8:39:24 PM
Subject: [TowerTalk] Concrete strength
One thought ...
Concrete used for beams and columns and other standalone structures
in a building or bridge need time to develop in order to perform the
intended
assignment. I am assuming in all discussed cases the concrete has iron in
it (rebars)
For the most part the 21 yards of concrete under my tower provides
dead weight, aided by the soil around it to keep the tower straight.
(Think overturn moment) or anchoring a guy wire.
In any event, the longer you can wait, the better off the ability to do
the job.
I waited the proscribed month, with an assembled tower and antenna. That
was the toughest part of the project ... the seemingly endless wait!
73
ed K0KL
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