climatological and air pollution factors greatly affect the corrosion damage to steel highway bridges. this report gives first results of a programme to define quantitative criteria by which the potential corrosivity of a prospective bridge location can be assessed. at seven sites throughout the country, the corrosion rates of hot-rolled mild steel, low alloy steel and zinc, are being measured under both open and sheltered exposure. meteorological and air pollution data are also being collected. to eliminate the considerable delays which occur in negotiating the building of permanent test compounds, a mobile test rig has been developed, which can be easily transportable to any prospective bridge location. from the first year's results, it is apparent that sheltered test specimens give a much closer indication of the corrosivity under a bridge deck than open exposure specimens. of the environmental factors, atmospheric chlorides and sulphur compounds are the major cause of variations in corrosion rate.(a)

Want to know more about this project?