Penetration of corrosion products and corrosion-induced cracking in reinforced cementitious materials: Experimental investigations and numerical simulations

This paper describes experimental investigations on corrosion-induced deterioration in reinforced cementitious materials and the subsequent development and implementation of a novel conceptual model. Reinforced mortar specimens of varying water-to-cement ratios were subjected to current-induced corr...

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Bibliographic Details
Published in:Cement & concrete composites 2014-03, Vol.47, p.75-86
Main Authors: Michel, Alexander, Pease, Brad J., Peterová, Adéla, Geiker, Mette R., Stang, Henrik, Thybo, Anna Emilie A.
Format: Article
Language:English
Subjects:
Cement reinforcements
Cements
Computer simulation
Corrosion
Corrosion products
Crack detection
FEM
Finite element method
Fracture mechanics
Mathematical models
Modelling
Non-destructive testing (NDT)
Penetration
Reinforcement
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Summary:This paper describes experimental investigations on corrosion-induced deterioration in reinforced cementitious materials and the subsequent development and implementation of a novel conceptual model. Reinforced mortar specimens of varying water-to-cement ratios were subjected to current-induced corrosion (10, 50, and 100μA/cm2). X-ray attenuation measurements and visual investigations provided both qualitative and quantitative information on the penetration of solid corrosion products into the surrounding cementitious matrix. X-ray attenuation measurements provided time- and location-dependent concentrations of corrosion products averaged through the specimen thickness. Digital image correlation (DIC) was used to measure corrosion-induced deformations including deformations between steel and cementitious matrix as well as formation and propagation of corrosion-induced cracks. Based on experimental observations, a conceptual model was developed to describe the penetration of solid corrosion products into capillary pores of the cementitious matrix. Only capillary pores within a corrosion accommodating region (CAR), i.e. in close proximity of the steel reinforcement, were considered accessible for corrosion products. The conceptual model was implemented into a FEM based cracking model and compared to experimental results provided in the literature and obtained from DIC measurements.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2013.04.011