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Reply To: | BP - Dwell time 5 minutes. |
Date: | Mon, 14 Dec 1998 07:22:42 -0500 |
Content-Type: | text/plain |
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John Leeke wrote: "Basically, if the material which the paint is applied
to is grounded (I.E. concrete or cement, stone, ect.) the strong high
frequency electrical fields which are produced by the tesla coil will
polarize the paint next on the grounded surface (or really any surface).
This polarization reverses at a high frequency causing mechanical stresses
between the surface and the paint. Eventually the weakend bond breaks under
the intense electrical fields and the paint "pops" off. Also thermal
expansion of moisture in the base material can cause the paint to peel off
from the coil as the RF energy produced causes moisture to vaporize."
Is this related to a process I heard about that can be used to prevent
deterioration of concrete in ocean-front buildings? The lecture was about
spectacular and rapidly deteriorating 50s buildings in Havana, but the same
would probably apply to Miami Beach and other such places. The process had
something to do with using an electrical current to change the positive
charge on the concrete to negative (or maybe the other way round, I'm not
very good at physics!), which apparently inhibits the deterioration due to
the salt in the air, or something like that. The architect I heard seemed
to be saying that that (very expensive) process is virtually the only way
to save concrete structures near the ocean.
As you can tell, I didn't understand all of this, but was interested both
because of the process and because I didn't know that these buildings
essentially couldn't be saved otherwise.
Anyone know anything about this??
Marilyn Harper
National Register of Historic Places
(which is in no way responsible for the content of this message)
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