Advanced SearchSearch Tips
Corrosion Characteristics of Reinforced Steel Bar Emedded in Multiple Mortar Specimen(W/C:0.5) Aged 5 Years in Seawater
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Corrosion Characteristics of Reinforced Steel Bar Emedded in Multiple Mortar Specimen(W/C:0.5) Aged 5 Years in Seawater
Moon, Kyung-Man; Takeo, Oki; Won, Jong-Pil; Park, Dong-Hyun; Kim, Yun-Hae;
  PDF(new window)
Reinforced concrete structures have been increasingly widely used in numerous industrial fields. These structures are often exposed to severely corrosive environments such as seawater, contaminated water, acid rain, and the seashore. Thus, the corrosion problems that occur with the steel bars embedded in concrete are very important from the safety and economic points of view. In this study, the effects of the cover thickness on the corrosion properties of reinforced steel bars embedded in multiple mortar test specimens immersed in seawater for 5 years were investigated using electrochemical methods such as the corrosion potentials, polarization curves, cyclic voltammograms, galvanostat, and potentiostat. The corrosion potentials shifted in the noble direction, and the value of the AC impedance also exhibited a higher value with increasing cover thickness. Furthermore, the polarization resistance increased with increasing cover thickness, which means that the oxide film that is deposited on the surface of a steel bar surrounded by alkali environment exhibits better corrosion resistance because the water, chloride ions and dissolved oxygen have difficulty penerating to the surface of the steel bar with increasing cover thickness. Consequently, it is considered that the corrosion resistance of reinforced steel can be improved by increasing the cover thickness. However, the corrosion resistance values of a steel bar estimated by measuring the corrosion potential, impedance and polarization resistance were not in good agreement with its corrosion resistance obtained by polarization curves.
Mortar specimen;Corrosion potential;Cover thickness;Polarization curves;Cyclic voltammogram;AC impedance;
 Cited by
Sway, R.N. Koyama, S.T. Arai, N. K., Durability of steel reinforcement in marine environment, ACI.SP 109-7 (1982), 147-1614.

Ozaki, S.N., Sixty-year-old concrete in marine environment, ACI. SP 109-26 (1983), 587-597.

Sagues, A.A., Corrosion measurement of reinforcing steel in concrete exposed to various aqueous environments, Proceedings of the corrosion/87 Symposium on corrosion of metals in concrete, (1987), 13-24.

Wheat, H.G., An investigation of the effect of the cathode area /anode area in the corrosion of steel in concrete, Proceeding of the corrosion/87 symposium on corrosion of metals in concrete (1987), 25-41.

Lockl, C.E. and Rincon, O., A study of Corrosion Electrochemistry of steel in chloride contaminated concrete using a rapid scan polarization Technique, Proceeding of the corrosion/87 Technique symposium on corrosion at metals in concrete (1987), 17-19.

Garces, P. and Hndion, L.G., Corrosion of steel reinforcement in structural concrete with carbon material addition, Corros. Sci. (49) (2007), 2557. crossref(new window)

Lee, S.H. and Han, J.S., A study on the measurement of steel corrosion in Morton by TEM method, j. of Ocean engineer. and Tec. (20) (2006), 59.

Kwon, J.H., A study on the hydration heat of anti washout underwater concrete using Fly Ash, J. of Ocean engineer. and Tec.,14 (4) (2000), 30.

Jeon, D.H., Moon, K. M., Baek, T. S and Kim, J.H., An anti-corrosion study at steel of reinforced concrete with sand with contami nated seawater in seawater solution, Corros. Sci. and Tec. 21 (1992), 11.

Kim, K.G., Ryou, B.H., Kim, S.J., Kim, K. J. and Moon, K.M., An electrochemical study on the effect at chloride ion to corrosion behavior of inner steel bar embedded in concrete in natural sea water, J. Ocean engineer. and Tec. 14 (2000), 23.

Thampson, N.G., Lawson, K.H. and Beavers, J.A., Symposium on corrosion at metals in concrete, Proceeding of the corrosion/87 Technique (1987), 182-199.

Apostoles, J.A., Park, D. and Carello, R. A., Symposium on corrosion at metals in concrete, Proceeding of the corrosion/87 Technique (1987), 168-181.

Yoo, Y.R., Cho, H.H., Take, S. Kim, J.G. and Kim Y.S., Influence of Cathodic Protection on the lifetime Extension of Painted Steel Structures, Met. Mater. Int. 12 (3) (2006), 255 crossref(new window)

ASTM C876-80, Half Cell Potentials of Rein-forcing Steel in Concrete (1980), 87.

Muylder, J.V. and Pourbaix, M., Atlas of Elec-trochemical Equilibrium in Aqueous Solution, Ed by Pourbaix, M., (1966), 310-313.