Numerical modelling of bond between concrete and corroded reinforcement

Authors: L. Chernin, D.V. Val
Paper category: conference
Book title: Concrete Durability and Service Life Planning – ConcreteLife’09
Editor(s): K. Kovler
Print ISBN: 978-2-35158-074-5
e-ISBN: 978-2-35158-085-1
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 587 – 594
Total Pages: 8
Language: English

Abstract: Corrosion of reinforcing steel is the main cause of deterioration of reinforced concrete structures. It causes cracking and eventually spalling of the concrete cover, reduction of crosssectional area of reinforcing steel and damage to bond between concrete and reinforcement. The paper concentrates on the last issue, i.e., corrosion-induced degradation of the bond in RC structures. It starts with a brief overview of existing analytical and numerical models of the corrosion-induced degradation of the interface between steel and concrete caused by corrosion. A new model describing the influence of steel corrosion on the interaction at the steelconcrete interface is then developed based on available experimental data. In the paper only plain reinforcing bars are considered, for which bond depends on two mechanisms – adhesion and friction. The model takes into account the effect of corrosion on these mechanisms and also accounts for the effects of creep and drying shrinkage. Thermal analogy is used for simulations of corrosion and drying shrinkage of concrete. The model in an axisymmetric formulation is implemented into a finite-element (FE) numerical model and then calibrated using experimental data from pull-out tests. Finally, the model is used to simulate pull-out tests of corroded plain round bars. Results of the FE simulations are presented and compared with test results.

Online publication: 2012-05-16
Publication Type: full_text
Public price (Euros): 0.00