Abstract
This study investigates the passivation behaviour and mechanism of mild steel embedded in low-heat Portland cement (LHC) paste. Results show that, compared to ordinary Portland cement (OPC), LHC has a significantly lower alkalinity at early stage and thus a lower passivity of mild steel embedded is obtained in LHC. This is explained by the formation of thinner passive film with higher contents of Fe2+ oxides in LHC at the early stage. Nevertheless, the passivity of mild steel in LHC becomes higher than that in OPC at later stage due to formation of a passive film in LHC with an identical thickness and higher content of Fe2+ oxide compared to that in OPC.
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