Abstract
A reinforced concrete specimen subjected to wetting–drying cycles was investigated. The rust distribution was observed by digital microscopy and scanning electron microscopy. This study observes five regions around the interface of steel and concrete: concrete, corrosion products-filled paste, mill scale, the corrosion layer (CL), and steel. This study confirms that rust did not fill the corrosion-induced cracks in the concrete cover before concrete surface cracking. The results also show that the penetration of corrosion products into the porous zone of concrete and the formation of a CL at the steel–concrete interface may proceed simultaneously after the initiation of steel corrosion.
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