Analytical Modeling of Reinforcement Corrosion Effects on RC Members Degradation

20/11/2013 2149

Memoria tratta da "The New Boundaries of Structural Concrete: Session B – Controlled-performance Concrete", ACI IC - Ancona 2011

A. Bossio 1, M. Montuori 2, F. Bellucci 3, G.P. Lignola 4, A. Prota 5, E. Cosenza 6, G. Manfredi 7

Due to the presence of degradation on reinforced concrete structures, recent codes have adopted the concept of structures’ durability and service life. The corrosion of reinforcement, which is a major cause of degradation, is not mainly related to the appearance of structures, but to structural safety. The consequences of corrosion of reinforcement are: (i) reduction of the cross section of the reinforcement, (ii) formation of corrosion products leading to loss of bond with concrete, (iii) appearance of cracks in the concrete cover and subsequent spalling. A mechanical analytical model to evaluate the stresses in the concrete surrounding the reinforcement bars is proposed. A refined model is then proposed to evaluate the non linear development of stresses inside concrete and crack propagation when reinforcement bars start to corrode. The relationships between the cracking development (mechanical) and the reduction of the steel section (electrochemical) are provided.

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1 Ph.D. candidate, University of Naples “Federico II” - DIMP, Italy, antonio.bossio@unina.it
2 Associate researcher, University of Naples “Federico II” - DIMP, Italy, mamontuori@unina.it
3 Full Professor, University of Naples “Federico II” - DIMP, Italy, bellucci@unina.it
4 Assistant Professor, University of Naples “Federico II” - DIST, Italy, glignola@unina.it
5 Assistant Professor, University of Naples “Federico II” - DIST, Italy, aprota@unina.it
6 Full Professor, University of Naples “Federico II” - DIST, Italy, cosenza@unina.it
7 Full Professor, University of Naples “Federico II” - DIST, Italy, gamanfre@unina.it