The effect of synthetic concrete pore solution on the depassivation of steel

Author(s): P. Ghods, T. Miller, O. Burkan Isgor, G. McRae
Paper category: Workshop
Book title: International RILEM Workshop on Integral Service Life Modelling of Concrete Structures
Editor(s): R.M. Ferreira, J. Gulikers, C. Andrade
Print ISBN: 978-2-35158-058-5
e-ISBN: 978-2-35158-090-5
Publisher: RILEM Publications SARL
Pages: 387 - 394
Total Pages: 8
Language: English

Abstract: 
Anodic polarization curves for low-carbon steel deformed rebar in simulated concrete pore solutions are reported. The solutions were all saturated with calcium hydroxide, and contained various amounts of sodium, potassium and sulphate ions, typically found in concrete pore solutions. The anodic polarization results were substantially different for the different solutions. Notably, the passive current density varied more that an order of magnitude depending on the chemical composition of the simulated pore solution. This suggests that passive film formation on steel rebar may be affected by the composition of the solution. In addition, a simple relation between the active metal corrosion potential and the passive current density was found, and discussed in terms of the corrosion probability and the protective properties of the rebar oxide.

Keywords: passive layer, pore solution, concrete, anodic polarization, corrosion

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00