[TowerTalk] exploding foundations

[Penninger Radio]

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
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----- Original Message ----- 
From: "DB1" <DB1 at Dccnet.com>
To: <towertalk at 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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