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Bridges

PAST / PRESENT CORROSION PREVENTION

Coating the wires with a protective oil, typically linseed oil, was the most common method of protecting the galvanized wire from corrosion in the past. Additionally, the main cables, outsideof the anchorage enclosures, were usually coated with a redlead paste and tightly wrapped with additional wire, which was then painted. Inside the anchorage enclosures, where the main cables splay or split into smaller wire strand groups, re-oiling
of the strand groups is often performed periodically and in some cases, the outer wires of the strands are painted, all in an effort to deter wire corrosion.

PRESENT / FUTURE CORROSION PREVENTION

While some of the corrosion prevention measures used in the past have not been completely abandoned, there are new methods and technologies being developed and implemented on new and existing suspension bridge structures throughout the world. One such method is dehumidification, or the lowering of moisture levels in the air that is in contact with the steel wires. It is believed that if relative humidity levels are kept at or around 40%, wire corrosion will not occur. On existing bridges, large dehumidifiers are being installed in the anchorage chambers to dry the air around the splayed wire strands. New cable bridge projects are incorporating sophisticated de-humidification systems into the design of the entire cable, including forcing dehumidified air through the main cables over their entire length. On any cable supported bridge structure, preventing or limiting wire corrosion saves on expensive and complex repairs down the road.

Oxifree TM198 is one of the new technologies which has the capabilities of dealing with Bridge Cable corrosion as it completely encapsulates the cables and tie bars thus eliminating the corrosion