[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.14773/cst.2017.16.2.69

Corrosion Mechanism and Bond-Strength Study on Galvanized Steel in Concrete Environment

Kouril, M. (Department of Metals and Corrosion Engineering, University of Chemistry and Technology)
Pokorny, P. (Department of Metals and Corrosion Engineering, University of Chemistry and Technology)
Stoulil, J. (Department of Metals and Corrosion Engineering, University of Chemistry and Technology)

Publication Information

Corrosion Science and Technology / v.16, no.2, 2017 , pp. 69-75 More about this Journal

Abstract

Zinc coating on carbon steels give the higher corrosion resistance in chloride containing environments and in carbonated concrete. However, hydrogen evolution accompanies the corrosion of zinc in the initial activity in fresh concrete, which can lead to the formation of a porous structure at the reinforcement -concrete interface, which can potentially reduce the bond-strength of the reinforcement with concrete. The present study examines the mechanism of the corrosion of hot-dip galvanized steel in detail, as in the model pore solutions and real concrete. Calcium ion plays an important role in the corrosion mechanism, as it prevents the formation of passive layers on zinc at an elevated alkalinity. The corrosion rate of galvanized steel decreases in accordance with the exposure time; however, the reason for this is not the zinc transition into passivity, but the consumption of the less corrosion-resistant phases of hot-dip galvanizing in the concrete environment. The results on the electrochemical tests have been confirmed by the bond-strength test for the reinforcement of concrete and by evaluating the porosity of the cement adjacent to the reinforcement.

Keywords

concrete reinforcement; galvanized steel; bond strength; porosity;

Citations & Related Records

Reference

1	U. Nurnberger, Otto-Graf-J., 11, 77 (2000).
2	A. Macias and C. Andrade, Br. Corros. J., 22, 113 (1987). DOI
3	A. Macias and C. Andrade, Br. Corros. J., 22, 162 (1987). DOI
4	M. T. Blanco, C. Andrade, and A. Macias, Br. Corros. J., 19, 41 (1984). DOI
5	B. Sorensen, Corrosion, 42, 197 (1986). DOI
6	M. Kouril, S. Krticka, and P. Novak, Corros. Mater. Prot. Mag. (CMP J.), 51, 80 (2007).
7	K. Wienerova, M. Kouril, and J. Stoulil K. Wienerova, M. Kouril, and J. Stoulil, Corros. Mater. Prot. Mag. (CMP J.), 54, 148 (2010).
8	CSN 73 1328, Determination of adhesion of steel to the concrete using both the ribbed and plain bars, Praha (1972).
9	M. Kouril, P. Novak, and M. Bojko, Cement Concrete Comp., 28, 220 (2006). DOI
10	M. Kouril, P. Novak, and M. Bojko, Cement Concrete Res., 40, 431 (2010). DOI
11	F. Tittarelli, G. Moriconi, R. Fratesi, L. Coppola, and M. Collepardi, Proc. Atti dell'Int. Conf. on Infrastructure regeneration and rehabilitation improving the quality of life through better construction, pp. 517-526, Sheffield (1999).