Abstract
Prolonged corrosion inhibition response of sodium lauryl sulphate (SLS) on steel reinforcement in contaminated concrete was investigated by gravimetric method and electrochemical techniques such as potentiodynamic polarization and electrochemical impedance spectroscopy. Using half cell potential measurements probability of steel reinforcement corrosion was monitored for a period of 480 days. FT-IR spectroscopic analysis of the corroded products deposited on the steel reinforcement revealed the mechanism of corrosion inhibition. Modification in the surface morphology of steel specimens in the concrete was examined by optical microscopy. During the period of investigation (480 days), SLS showed appreciable corrosion inhibition efficiency on the steel reinforcement in concrete.
Highlights
Reinforced concrete structures are developed to ensure the strength and existence throughout their lifetime
It is understandable that the steel reinforcement in the concrete containing sodium lauryl sulphate (SLS) was less corroded than reinforcement in the SAMPLE 1
It can be assured that SLS can act as an efficient admixture, which resists the steel reinforcement corrosion in the contaminated concrete structures for a long time
Summary
Reinforced concrete structures are developed to ensure the strength and existence throughout their lifetime. The deterioration and collapse of reinforced concrete structure are a major issue in construction field [1,2,3]. Depassivation of the steel reinforcement occurs locally in the presence of chloride ions leading to pitting corrosion [9,10,11,12]. Passivation of steel reinforcement takes place due to the alkaline compounds present in the concrete. The cost of replacing deteriorated concrete structures may affect the GDP (Gross Domestic Product) of a country. To find out an effective and economic method to combat the steel reinforcement corrosion in concrete has been attracted by the researchers and engineers for the last two decades
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