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        The Effects of Electro-Chemical Chloride Extraction on the Migration of Ions and the Corrosion State of Embedded Steel in Reinforced Concrete

        Hai Yen Thi Nguyen,Withit Pansuk,Pakawat Sancharoen 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8

        The effects of electrochemical chloride extraction were evaluated using different electrolytes and binders on cylindrical concretespecimens with a water/binder ratio of 0.4. Two-percent NaCl by weight of binder was added to the water as a chloride source duringconcrete casting. After the specimens were immersed in water for three months, direct current 0.5 A/m2 was applied to releaseapproximately 30% initial chloride. The use of intermittent mode during extraction process was more efficient in releasing chloridethan a continuous mode. After treatment, although the average remaining-chloride content was higher than threshold value, itscontent at the interface was only approximately 0.4%. The accumulation of alkaline ions around the embedded steel was noticeablebut the distribution of calcium ions showed as different tendency. The migration of ions from the electrolyte was insignificant. Thisdemonstrated the important role of internal ions in transferring the charge during extraction; simultaneously, the decomposition ortransformation of hydrated products is inevitable. After the treatment was stopped for four weeks, the half-cell potential of the steelreached to low-corrosion state.

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