Well if you put a torch to concrete, even 40 year old stuff, it will blow up
in your face, could be moisture in the concrete.
my 3 1/2 cents worth.
Charles, KC9DAO
^
^
----- Original Message -----
From: "DB1" <DB1@Dccnet.com>
To: <towertalk@contesting.com>
Sent: Friday, September 14, 2007 1:43 PM
Subject: [TowerTalk] exploding foundations
> All this talk of concrete exploding due to the moisture flashing to steam
> is "in my opinion" absolute crap. The only way steam can occur is if the
> water in the concrete is subject to atmospheric pressure otherwise
> regardless (almost) of temperature it stays in the liquid state.(Although
> water will boil at room temperature if you subject it to a
> um. -14.7 psi.)
>
> IE: Water in a car radiator with the cap on. Water boils at 212 F under
> atmospheric pressure (14.7psi).....for every pound of pressure you put on
> that water in an enclosed space, it raises the boiling point by 3 degrees
> F. so with a 15 lb radiator cap lets say, the boiling point of the water
> would be 257 F. When you release that cap the superheated liquid water
> flashes to steam at atmospheric pressure with 970 BTU's/Cu Ft of energy
> (970 BTUs is the amount of energy that is required to change 1 cu ft of
> water at 212F to Steam at 212F
>
> As water in concrete "is" in an enclosed ( and for all intensive purposes
> air tight )space and is under tremendous pressure (*a big radiator cap if
> you will) , it cannot in all likelihood flash to steam.
>
> This is however a great discussion (grin)
>
> Derek VE7RE
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