CORROSION PROTECTION OF A HALIFAX HARBOUR BRIDGE: CHALLENGES,ISSUES AND OPPORTUNITIES

摘要

The Angus L.Macdonald Bridge is a 1.3-kilome-ter-long(4,265-foot-long)cable suspension bridge that carries automotive traffic over the Halifax Harbour between Dartmouth and Halifax.There are four approach spans to the west cable bent on the Halifax end and 12 approach spans to the east cable bent on the Dartmouth end.The bridge was opened April 2,1955.The Macdonald Bridge was originally painted with a lead-based oil alkyd,three-coat paint system.In 1993,because of environmental concerns and availability,Halifax Harbour Bridges(HHB),the organization responsible for operating and maintaining bridges in the Halifax Harbour,transitioned to a zinc-hy-droxy-phosphite(Fig.1).Spot repairs are conducted by a seasonal crew of 30 painters who join HHB for the painting season.