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The intention of this report is to show how predictive models for deterioration of reinforced concrete can be used to aid the decision making process of whether the selective use of stainless steel reinforcement is a suitable option tor avoidance of damage to concrete structures through reinforcement corrosion in chloride environments. The report briefly reviews the processes that can result in initiation of corrosion of normal carbon steel reinforcement and the most popular mathematical models that have been developed to describe these processes. A simple model is then presented to illustrate the influence of the main parameters, the uncertainties surrounding them, and the effect of using stainless steel reinforcement. The report provides an introduction to the mechanisms of initiation of reinforcement corrosion in concrete and to the concepts of modelling these processes. It also provides an introduction to the use of stainless steel reinforcement as protection against reinforcement corrosion. The report includes a simple representative model (SRM) for prediction of chloride-induced corrosion to illustrate how the selective use of stainless steel reinforcement might be of benefit under certain conditions. The model is based on existing readily available models and is intended to be illustrative rather than attempt to provide a tool tor precise analysis. It is intended that this model can be used to compare different combinations of concrete composition and cover to reinforcement in relation to achieving required durability in aggressive chloride environments. These options can in turn be compared with the alternative solution of selective use of stainless steel reinforcement. Modelling of deterioration processes in reinforced concrete is an imprecise science and is likely to forever remain so because of the inherent variability within materials, exposure conditions and construction quality. Moreover, because of the infinite variety of concrete compositions likely to be produced, and an increasing selection of additional protective measures, it is unlikely that there will ever be a unique solution to achieving durability under a given set of circumstances.
Stainless steel reinforcement: the use of predictive models in specifying selective use of stainless steel reinforcement
Additional title:
Bewehrungsstäbe aus Edelstahl Rostfrei: Anwendung von Vorhersagemodellen in der Spezifizierung des selektiven Einsatzes von Bewehrungsstäben aus Edelstahl Rostfrei