Do you think maybe that attention to concrete base details may be one reason
failures occur elsewhere? Sure, tower companies are risk adverse and may go
a tad HD to avoid legal problems but careful doesn't get you hurt.
Patrick AF5CK
-----Original Message-----
From: Ken
Sent: Sunday, December 01, 2013 9:55 AM
Cc: TOWERTALK@contesting.com
Subject: Re: [TowerTalk] More crank-up questions
I am curious. All this talk about concrete strength, rebar, etc. Is
anyone aware of a tower base failure due to strength of the concrete or lack
of rebar? (Except for damage from a lightning strike.) From what I hear,
the vast majority of tower failures are 20-30' above the base. Base
failures? Are they really an issue?
As I mentioned, 40 years ago, little was said about base concrete, rebar,
etc. OTOH, 40 years ago, 60' was a big tower. Maybe that's part of the
issue.
Ken WA8JXM
On Dec 1, 2013, at 10:29 AM, Patrick Greenlee wrote:
Mike, Be careful. Don't let anyone add excessive water to make the mix
easier to work with or self leveling or whatever. That lowers the
strength irrespective of what the strength would have been (how many bag
mix.)
You can have the delivery guy add a water reducer plasticizer shortly
before pouring (but do allow time for it to thoroughly mix in) as the
additive does not have a long pot life. This additive makes the mix act as
if you had added water. It makes the mix easier to work, easier to get the
voids filled for good reinforcing steel to concrete contact. This
additive does not reduce the strength of the mix. Allows you to use the
optimum water for strength while being easy to flow easy to work. The
additive is not expensive.
Good luck to you, I get a little pain in my back just thinking about the
job ahead of you.
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