On 6/22/2013 9:35 AM, I wrote:
According to Anchor Guard, an anchor even all by itself can act as a
corrosion cell:
"Basic Anchor Support Design Example 1. Figure 6 shows the basic design
of a typical anchor support. The anchor support has all the necessary
elements of a corrosion cell. The shaft itself acts as both anode and
cathode as well as the electrical path between the two. The concrete and
soil act as dissimilar electrolytes. The soil has less oxygen just above
the concrete anchorage and consequently, less resistivity. The
electrical path is the shortest between the anode and the cathode at the
same point as the oxygen deficient soil, thus the deteriorating action
of corrosion is most strongly in effect in this area. Experience has
shown that this is the area most likely to deteriorate and cause the
tower to fail."
One should note of course that Anchor Guard is in the business of
selling anchor protection.
But it would seem that a prudent design would include insulation from
the tower AND total encasement in concrete below ground level.
-Steve K8LX
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