[TowerTalk] Using old concrete in new pour

[David Gallatin via TowerTalk]

Thanks for all the replies. I figured it was probably a bad idea but wanted to check it out. You never know. I once saw a cartoon of Custer at Little Big Horn refusing to speak to a Gatling Gun salesman because they were 'new'. Maybe the artist didn't know they were actually around in the Civil War... Nevertheless that message sunk in.   I have a pour scheduled for Monday. $233 for 1.5 yds direct into my hole, which I go now to dig. My back hurts already. :)  73,
David, AA9G

ex W5DCG and KC9EEV

 

     On Tuesday, October 21, 2014 10:00 PM, "john at kk9a.com" <john at kk9a.com> wrote:
   

 One concern is if you are making the concrete "soupy" by adding extra water
it becomes less strong.  A 30' aluminum tower has a small concrete base so
why not play it safe and use the proper mixture?

John KK9A


To:    "towertalk at contesting.com" <towertalk at contesting.com>
Subject:    [TowerTalk] Using old concrete in new pour
From:    David Gallatin via TowerTalk <towertalk at contesting.com>
Reply-to:    David Gallatin <kc9eev at yahoo.com>
Date:    Tue, 21 Oct 2014 16:53:26 -0700
List-post:    <towertalk at contesting.com">mailto:towertalk at contesting.com>
Hello everyone,
A ham friend today suggested using concrete from an old pad that's broken
into 
small (maybe fist size or a bit smaller) pieces and using it in
a new pour, specifically for my new 30 foot aluminum tower. He said you make

the new mix "a little soupy" and toss the old chunks in as you go, the idea 
being less new concrete is used (and paid for) and when it dries you can't
tell 
a difference "concrete being concrete". He did not specify what kind of
ratio 
of old to new is used but he does have two pads of his own he has done this 
with that hold 60' steel self supporting towers. 
I have tried to research this and come up with nothing. I did find reference
to 
concrete being recycled (crushed) into aggregate size and used as such in
new 
pours but what he is talking about does not seem to be the same thing. 

 Obviously I am a tad concerned about doing this. Has anyone heard of this 
technique before?
 
73, 
David, AA9G

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