Abstract
Iron oxides formed by the corrosion of a steel reinforcing bar were found to accumulate at interfaces between aggregate and cement paste in Portland cement-based concrete. Microstructural characterization of the zones of oxide was carried out using optical microscopy, scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) spectroscopy. The study showed that the oxide layer has an average thickness of about 1.5 mm, and consists of inner and outer layers with different types of oxides in each layer. A mechanism based on the Schikorr reaction is proposed for the preferential formation of iron oxides in the two layers taking into account local variations in pH of the pore solution during the early ages of the cement paste.
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