And it is still a good insulator during a rain storm?????? Or would the
torturous path of the water molecules embedded in concrete be too much to
create a free flowing conductive path? Wouldn't it depend upon the type of
concrete and/or the process??? ...
Before we get too carried away, it might be appropriate to remind ourselves
that water, in itself, is an excellent insulator. Pure water is not a
conductor, until you dissolve some free ions into it (eg. salt). I'm not a
civil engineer, but I suspect that concrete does not dissolve each time it
gets rained upon. This would make for some very poor housing; not to
mention falling bridges and other nasty things. Also, most civil engs
strive to keep salt out of the concrete mix, since it doesn't do the rebar
much good.
BTW, all that water that is used to mix the concrete reacts with the cement
and forms a solid compound. It's not just sitting in there, sloshing
around. Once the concrete is set, there is very little, if any, water
absorption. Any further water that may be added, just stays on the surface.
Of course, if I used cement or any other insulator on my 200 kW power
supply, I would tend to refrain from hosing it down very often.
Egon :-)
______________________________________
Egon H. Varju, PEng
E.H. Varju & Associates Ltd.
North Vancouver, Canada
HAVE MODEM
Tel: 1 604 985 5710
Fax: 1 604 273 5815
WILL TRAVEL
E-mail: [email protected]
[email protected]
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