Civil Engineering Reference
In-Depth Information
Due to its limited use in the UK and elsewhere in Europe there is limited
home-grown information on its performance. However, based on the extent
of US usage, there do not appear to be any major issues with its use. Hundreds
of thousands of square metres have been applied to bridges in the USA.
The largest installations have been in Oregon where a number of historic
landmark bridges were protected with this system (Covino et al. 2002). There
have been other large installations on inland bridges elsewhere in the USA
and Canada. Several hundreds of thousands of square metres of impressed
current thermal sprayed zinc anodes have been applied to bridges in the
USA.
Figure 5.1
shows an impressed current cathodic protection installation
on a bridge substructure in the UK.
5.2 Thermal sprayed zinc as a galvanic anode
The development of thermal spayed zinc as an impressed current anode
was followed by its use as a galvanic anode by Florida Department of
Transportation (Kessler and Powers, 1990) where thousands of marine
bridge piles and columns have been protected. For marine applications it is
Figure 5.1
Thermal sprayed zinc applied to the leaf piers of Golden Fleece Interchange
and the diaphragms between the longitudinal steel where moisture run-down might
degrade the life of the zinc anode.
