Operation manual of ZBL-R800, ZBL-R630, ZBL-C310A
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15
Figure 2.7 Double-electrode method
When tested with single-electrode method, a constant potential
reference electrode (copper sulfate electrode or agcl electrode) should
be placed on the surface of concrete to form battery with rebar, the we
can identify the potential distribution through testing the relative
electric potential difference between rebar and reference electrode.
Through summarizing statistical law between potential distribution
and rebar corrosion, corrosion can be indentified through potential
test.
Double-electrode method needs putting two electrodes which distance
is constant on the surface of concrete. Moving these two reference
electrodes on the surface of concretes, if the rebars under the two
electrodes are in the same state, there is no potential difference; if
different, such as one is in corrosion, the other is not, potential
difference can be measured and corrosion can be identified
successively.
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