Corrosion prevention of rebar in concrete due to chloride

Y Srimahajariyaphong, S Niltawach


In coastal and brackish areas, black rebar in concrete structures suffers from chloride corrosion which leads to spalling of the concrete. The Half Cell Potential Measurement technique has been applied to study the corrosion behavior of both black and galvanized deformed rebar in different concretes. Additives in the concretes vary from pozzolan, calcium nitrite, to pozzolan plus calcium nitrite. Rebar which has higher half cell potential possesses better corrosion resistance. It has been found that concrete cover thickness has no significant effect on the half cell potential of either rebar; that for both types of rebar, the half cell potential is highest in concrete coming from cement + fly ash, and finally, that the half cell potential of galvanized rebar is lower than that of black rebar because zinc has lower electro-chemical potential at -763 mV than steel at -440 mV.

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Printed ISSN: 0857-6149

Online ISSN: 2630-0508