CATHODIC PROTECTION FIGURE 3
at 18 test points located on the surface of the concrete along the south and north curbs. Polarizations from the surface were determined using a portable copper/cop- per sulfate (Cu/CuSO4
) reference elec-
trode (CSE). Potential decays over a 4-h test period are shown in Figure 2. Potential decays recorded at embed- ded Ag/AgCl reference electrodes are shown as dotted lines in Figure 2. Decays recorded at surface test points are shown as solid lines in Figure 2. According to NACE SP0290-2007,2
if
the total potential decay is greater than 100 mV, the steel is being adequately protected from corrosion. The measured potential decays at Jackson Street Bridge indicate adequate protection at all but three points. Excluding these three sus- pect test points, the average potential decay was 260 mV. In all, three potential decay tests were
performed due to discrepancies seen in the data collected on the westbound lane WN \PM 2IKS[WV ;\ZMM\ *ZQLOM