CoatingsPro Magazine Supplements

Concrete Dec 2018

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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Page 35 of 43

36 CONCRETE COVERED DECEMBER 2018 COATINGSPROMAG.COM had ex per ienced premature fai lure of an arc-sprayed zinc cor rosion protection system on por tions of the Ni les Channel Br idge in the Flor ida Keys. Columns of the South Flor ida br idge (SR 802 over Intracoasta l Water way) ex hib - ited cor rosion above the tida l zone. Both projects uti lized a l k a li-activated ga lvanic anodes insta l led inside stay-in-place for ms (Fig ure 3). T he bottoms of these jackets are out of the water except dur ing stor m events. T he stay-in- place form can be either fiber- glass or PVC. In the South Florida project, FRP forms were used, while the Niles Channel project used PVC forms. PVC forms have the follow ing advantages: they are modular, provide improved bond to the fill concrete, and are easily modified on site. As w ith all FDOT projects, monitoring provisions were provided such that long-term cathodic protection performance could be verified. Corrosion Protection Figure 3: Alkali-activated galvanic anodes on the Niles Channel Bridge (left) and installed inside stay-in-place forms on SR802 - South Florida (right). Figure 4: SR802 — Polarization of the reinforcing steel in the jacketed columns of the westbound bridge. Corrosion Protection continued on p. 38

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