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Utilization of seawater as mixing and curing water is normally prohibited in reinforced concrete structure s because seawater contains high chloride ion concentration which can accelerate corrosion of... steel bar s in concrete. Seawater , however has a possibility for mixing water by adding supplementary substance to prevent corrosion, e.g. calcium nitrite . The aims of this study is to evaluate the effectiveness of calcium nitrite based inhibitor (CNI) as coating for inhibiting corrosion in seawater mixed concrete with several parameters such as type of coated steel bar and supplementary cementitious material (SCMs). Various CNI coating concentration were applied to mortar paste as coating of steel bar. Moreover, Ground Granulated Blast Furnace Slag (GGBFS) was used as SCMs. As the comparison, OPC seawater mixed mortar specimens from previous research were also prepared. Specimens were exposed to dry and wet cycles: drying in natural laboratory temperature for 5 days and immersion in seawater for 2 days. Corrosion risk was investigated by electrochemical measurement such as half cell potential, polarization resistance and anodic-cathodic polarization . These data demonstrate a steady state corrosion rate and the efficiency of corrosion inhibitors. As a result, overall, CNI coated specimens show a well performance to prevent the corrosion behavior.続きを見る
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