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Modelling of reinforcement corrosion - Investigations on the influence of shrinkage and creep on the development of concrete cracking in the early propagation stage of reinforcement corrosion
Since the initiation stage of the damage process due to reinforcement corrosion had been successfully investigated in the recent past, the damage progress in the propagation stage is currently in the focus of research. The work deals with the mechanisms of cracking and spalling due to corrosion of reinforcement and aims for the development of an analytic prediction model of the damage process. On this occasion the influence of shrinkage and creep on the stress condition within the concrete cover is of major importance to the subsequent analysis of the crack formation due to reinforcement corrosion in the early propagation stage. The presented theoretical and experimental approach allows estimating the level of stresses and the chronology of appearance of cracks inside the concrete cover, which are caused by shrinkage and creep of the concrete and later by the corrosion of the reinforcement. It is based on novel experimental investigations being supplemented with numerical analyses to enable transferability on any condition of practical relevance. Based on parameter studies with numerous specimens and on inverse analyses, a prediction model for the time dependent damage process can be derived. Since the accuracy of the analytic model depends on the quality of the implemented constitutive models of the materials, a main purpose of the work will be to determine the mechanical properties of the corrosion products. The model will be suitable for different and changing conditions regarding geometry of concrete cover and reinforcement bar diameter, material properties and climatic conditions. It allows for the prediction of the damage development and serves as a part of a complete probabilistic design approach for durability of reinforced concrete structures.
Modelling of reinforcement corrosion - Investigations on the influence of shrinkage and creep on the development of concrete cracking in the early propagation stage of reinforcement corrosion
Since the initiation stage of the damage process due to reinforcement corrosion had been successfully investigated in the recent past, the damage progress in the propagation stage is currently in the focus of research. The work deals with the mechanisms of cracking and spalling due to corrosion of reinforcement and aims for the development of an analytic prediction model of the damage process. On this occasion the influence of shrinkage and creep on the stress condition within the concrete cover is of major importance to the subsequent analysis of the crack formation due to reinforcement corrosion in the early propagation stage. The presented theoretical and experimental approach allows estimating the level of stresses and the chronology of appearance of cracks inside the concrete cover, which are caused by shrinkage and creep of the concrete and later by the corrosion of the reinforcement. It is based on novel experimental investigations being supplemented with numerical analyses to enable transferability on any condition of practical relevance. Based on parameter studies with numerous specimens and on inverse analyses, a prediction model for the time dependent damage process can be derived. Since the accuracy of the analytic model depends on the quality of the implemented constitutive models of the materials, a main purpose of the work will be to determine the mechanical properties of the corrosion products. The model will be suitable for different and changing conditions regarding geometry of concrete cover and reinforcement bar diameter, material properties and climatic conditions. It allows for the prediction of the damage development and serves as a part of a complete probabilistic design approach for durability of reinforced concrete structures.
Modelling of reinforcement corrosion - Investigations on the influence of shrinkage and creep on the development of concrete cracking in the early propagation stage of reinforcement corrosion
Bohner, E. (author) / Müller, H.S. (author)
Materials and Corrosion ; 57 ; 940-944
2006
5 Seiten, 5 Bilder, 3 Tabellen, 10 Quellen
Article (Journal)
English
Concrete cracking and corrosion of reinforcement
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