Among of the non-destructive repair methods for reinforced concrete structures suffering from chloride-induced reinforcement corrosion is the use of surface-migrating corrosion inhibitors, which can be applied to the concrete surface with the aim of inhibiting/delaying reinforcement corrosion. Sodium mono-fluro phosphate (MFP) was consequently introduced and adopted as a surface treatment. This paper therefore, aims to study the role of MFP in controlling the corrosion activity of corroded reinforcement embedded in OPC matrix made with or without cement replacement materials and to determine the factors controlling such treatment. The impact of MFP on crystal structure and cement-phase composition of OPC matrix was also clarified. As a result, the rate of corrosion and corrosion potential of different corroded reinforced mortar specimens (OPC, OPC/silica fume and OPC/fly ash) contaminated with 0.6, 1.2 and 2.4% NaCl during their exposure to 0, 5, 10 and 20% MFP were regular monitored, every two weeks up to 26 weeks, using zero-ammeter and half-cell apparatus, respectively. Moreover, selected samples were taken from the untreated and treated OPC specimens with 10% MFP to be examined with X-ray diffraction and scanned electron microscope. |
