Corrosion Behavior of Reinforcing Steel in Concrete Elements in Alkaline Medium

N Bourenane, N Sedira, Y Hamlaoui



Corrosion of steel in reinforcement concrete is complex. When chloride ions and oxygen reach reinforcing steel, corrosion is initiated. The deterioration process starts with expansions of the bare steel substrate then after cracks in the concrete are developed. The aim of this work is to determine firstly, through the electrochemical technic, the critical concentration of chloride ions which are responsible for the initiation of the dissolution step. Then, the effect of the external parameters on the rate of penetration of the chloride ions into the concrete are also evaluated. For this propose, the electrochemical behavior of the steel of construction “E24” is studied in carbonate medium without and with different concentrations of chloride ions. The effect of various parameters such as temperature, ions concentration and solution pH was also evaluated through the evolution of the open circuit potential, d.c polarization measurement and electrochemical impedance spectroscopy. The d.c polarization and EIS results shows that the addition of 0.5M CaCl2 (as critical concentration) to the saturated Ca(OH)2 solution, brings to a rapid and a continuous dissolution of the substrate where after 3 hours of immersion time the whole surface of the substrate was covered the corrosion products. This is may be due to specific adsorption of Cl-.

Full Text:



Bertolini, L., Bernhard, E., Pietro, P., & Rob, P. (2004). Corrosion of steel in concrete: prevention, diagnosis, repair. Bedin: Wiley—VCH.

Byfors, K. (1987). Influence of silica fume and flyash on chloride diffusion and pH values in cement paste. Cement and Concrete research, 17(1), 115-130.

Byfors, K., Hansson, C. M., & Tritthart, J. (1986). Pore solution expression as a method to determine the influence of mineral additives on chloride binding. Cement and Concrete Research, 16(5), 760-770.

Diamond, S. (1975). Long-term status of calcium hydroxide saturation of pore solutions in hardened cements. Cement and Concrete Research, 5(6), 607-616.

Diamond, S. (1981). Effects of two Danish flyashes on alkali contents of pore solutions of cement-flyash pastes. Cement and Concrete Research, 11(3), 383-394.

Drouin, B., Latour, G., & Mohamed, H. (2011). More than 10 years successful field applications of FRP bars in Canada. In CDCC 2011, The 4th Int. Conf. on Durability and Sustainability of Fiber Reinforced Polymer (FRP) Composites for Construction and Rehabilitation.

Duprat, M., & Dabosi, F. (1981). Corrosion inhibition of a carbon steel in 3% NaCl solutions by aliphatic amino-alcohol and diamine type compounds. Corrosion, 37(2), 89-92.

El Haleem, S. A., El Aal, E. A., El Wanees, S. A., & Diab, A. (2010-a). Environmental factors affecting the corrosion behaviour of reinforcing steel: I. The early stage of passive film formation in Ca (OH) 2 solutions. Corrosion Science, 52(12), 3875-3882.

El Haleem, S. A., El Wanees, S. A., El Aal, E. A., & Diab, A. (2010-b). Environmental factors affecting the corrosion behavior of reinforcing steel II. Role of some anions in the initiation and inhibition of pitting corrosion of steel in Ca (OH) 2 solutions. Corrosion science, 52(2), 292-302.

Ghods, P., Isgor, O. B., McRae, G., & Miller, T. (2009). The effect of concrete pore solution composition on the quality of passive oxide films on black steel reinforcement. Cement and Concrete Composites, 31(1), 2-11.

Kosmatka, S. H., Kerkhoff, B., Panarese, W. C., MacLeod, N. F., & McGrath, R. J. (2004). Dosage et contrôle des mélanges de béton. Bulletin d'ingenierie EB101, Cement Association of Canada.

Longuet, P. (1973). La phase liquide du ciment hydraté, revue des Matériaux de Constructions et de Travaux Publics, section Ciments. pp 35-41.

Longuet, P., Peguin, P., Rubaud, M., & Zelwer, A. (1973). Bases experimentales de l’etude electrochimique du comportement des metaux en presence di beton. Corrosion TPE, 2(3), 155-159.

Neville, A. M. (2000). Propriétés des bétons. Eyrolles.

Orazem, M. E., Pébère, N., & Tribollet, B. (2006). Enhanced graphical representation of electrochemical impedance data. Journal of The Electrochemical Society, 153(4), B129-B136.

Perier, V., Chataigner, S., & Pruvost, A. (2013). Comparaison de différentes armatures utilisées pour le renforcement du béton.. Bulletin des laboratoires de Ponts et Chaussées, pp 51- 62.

Rosenberg, A. C. M. H. (1989). Mechanisms of corrosion of steel in concrete. Materials science of concrete, 1, 285-316.

Rothstein, D., Thomas, J. J., Christensen, B. J., & Jennings, H. M. (2002). Solubility behavior of Ca-, S-, Al-, and Si-bearing solid phases in Portland cement pore solutions as a function of hydration time. Cement and Concrete Research, 32(10), 1663-1671.

Article views 242

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Civil Engineering and Architecture Faculty- University Amar Telidji of Laghouat JBMS@2019.