The summary results of experimental measurements are evaluated after 1 year exposure of corrosion specimens. This chapter presents results from 5 bridges that have undergone installation of corrosion specimens in the period from 2011 to 2013. Attention is paid to the development of corrosion products on typical surfaces of bridge structures, evaluation of the effect of surface orientation, the development of corrosion products on surfaces exposed to leaking water and dependence between the average thickness of the corrosion losses.
All of bridges are designed as steel plate girder bridges. Corrosion specimens are installed on typical surfaces of these bridges. It is necessary to distinguish between external and internal surfaces and also between horizontal and vertical surfaces when evaluating the patina development. Horizontal surfaces are divided into surfaces exposed from above (upper surface of the bottom flanges) and surfaces exposed from the bottom (soffit areas). Average thicknesses of corrosion products and corrosion losses after one year of exposure are given,are not subjected to leakage from expansion joint or failed drainage systems.
The maximum thickness values of corrosion products and corrosion losses were detected on the upper outer surface of the bottom flanges of main girders. The average annual corrosion loss is 2.7 times higher compared to the corrosion loss of the outer web of the main girder