[TowerTalk] Concrete "Slump"
kk9a at arrl.net
kk9a at arrl.net
Thu May 29 22:52:07 EDT 2003
Is anyone aware of tower failure due to inadequate concrete strength? I've
always ordered the standard 5 bag mix.
----- Original Message -----
From: <K7LXC at aol.com>
To: <tombaugh at discoverynet.com>; <towertalk at contesting.com>;
<k6rix at arrl.net>
Sent: Thursday, May 29, 2003 21:21
Subject: Re: [TowerTalk] Concrete "Slump"
In a message dated 5/29/03 12:32:34 PM Pacific Daylight Time,
tombaugh at discoverynet.com writes:
> The cost of 3500 pound or even 4000 Pound mix is not significant in the
> large scheme (guessing $1 / yd). The pour is a relatively small and the
> price will be proportionately small. We pour 4000 pound concrete almost
> exclusively. YES it is overkill! However, the tradeoff is in workability.
> Stronger concrete has more of the expensive stuff.. the glue.. the
> Cement and that is what makes the mixure "creamy" and easy to work. Too
> water can "appear" to give these properties but good concrete is good
> concrete. Add water and increase slump (good description below). but good
> concrete (4000 pound mix) will have a good slump (lower number) because
> has more GLUE.
Another reason for using 4000# mix is that it'll cure to the specified
3000# fairly quickly - in a couple of days. This means you can load the base
much earlier than waiting for the 3000# mix to cure to 3000#.
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