The main objective of the program is specification of analytical prediction model for calculation of design values of corrosion losses on the basis of measured data statistical evaluation. In practice, prediction models for calculation of corrosion losses are used primarily for design of load-bearing structures of buildings. Statically needed value of required corrosion allowances is determined on the basis of predicted corrosion losses .
This described program of experimental atmospheric corrosion tests of weathering steels is designed as a long-term project. Complete results of the program should be available after 10 years of corrosion specimens’ exposure. To create conclusions about the corrosion processes on typical surfaces of steel structures it was necessary to install corrosion specimens on a sufficient number of surfaces. At the end of year 2014 corrosion specimens were fixed on 97 surfaces. Results from the measurements indicate that corrosion losses of weathering steels are significantly conditioned by location of exposed surfaces within the structure. An important part of the experimental measurement is an assessment of corrosion processes on the surfaces exposed to leaking water. Results of the experiment can be used in evaluating the impact of corrosion damage on bearing capacity and lifetime of the structure. Significant correlation dependence between average value of the thickness of corrosion products and corrosion losses after one year of exposure was identified. One of expected outcomes of corrosion tests will be the description of dependencies between these two measured quantities for longer exposure.
Measurement of thicknesses of corrosion products can serve as a tool for apposite estimation of corrosion rates. The measurement is very simple - is carried out using a portable thickness gauge without need anyhow interfere into the structure.