On Wed, 03 Aug 2005 11:28:18 -0700, Jim Lux wrote:
>They can add things to the concrete mix to
>enhance the conductivity as well (used in, for instance, electric railroad
>installations).
In some installations, concrete very LOW conductivitity is desired. Examples
are
electric railways and sidewalk heaters, where the concrete may serve as an
insulator.
Jim
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