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Analysis of the parameters affecting probabilistic predictions of initiation time for carbonation‐induced corrosion of reinforced concrete structures
Author(s) -
Lollini F.,
Redaelli E.,
Bertolini L.
Publication year - 2012
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201206720
Subject(s) - carbonation , service life , concrete cover , corrosion , reinforced concrete , probabilistic logic , structural engineering , reinforcement , sensitivity (control systems) , materials science , computer science , environmental science , engineering , composite material , artificial intelligence , electronic engineering
Probabilistic approaches are available for service life design of reinforced concrete structures subjected to reinforcement corrosion. The International Federation for Structural Concrete ( fib ) has proposed a model code where design equations and related parameters, involving materials properties, exposure conditions and construction details, are reported. This paper investigates the role of design parameters in the prediction of service life by applying the fib design procedure to existing structures suffering carbonation‐induced corrosion. Results of the modelling were compared to results of the inspection and a significant difference was observed. In order to investigate the reasons for this difference, the roles of concrete cover thickness and carbonation depth were considered separately in the modelling of service life. The concrete cover thickness had a significant effect on the output of the service life modelling, which however was not sufficient to explain the discrepancy between in situ and modelling results. The modelled values of carbonation depth were also affected by errors; sensitivity analysis showed that, although some parameters had higher influence than others, no single parameter had a predominant role.