Abstract
The long-term corrosion resistance of reinforcing steel embedded in alkali-activated slag (AAS) mortar and ordinary Portland cement (OPC) mortar, when subjected to aggressive marine environments (chloride exposure and atmospheric exposure) for 54 months, was evaluated by electrochemical impedance spectroscopy. Corrosion morphology at the steel-mortar interface, composition of steel corrosion products and microstructure of mortar substrate were also investigated for AAS mortar in different aggressive environments. After long-term atmospheric exposure, AAS mortar provided unexpectedly lower corrosion resistance for steel compared with that for chloride exposure, which can be further evidenced by interfacial morphology and composition of steel corrosion products.
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