Aniline effect on concrete steel rebar degradation in saline and sulfate media
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Description
Electrochemical potential monitoring experiments were performed on mild steel rebars
embedded in concrete admixed with aniline inhibitor and fixed amount of sodium
chloride salt partially immersed in sulfuric acid and sodium chloride solution. The open
circuit potential corrosion monitoring technique was employed and potential readings
were taken in accordance with ASTM C 876. Repressive attribute and consistency of the
inhibitor was then estimated by the Weibull probability density distribution as an extreme
value statistical modeling approach to study performance effectiveness and predict the
most efficient inhibitor concentration in each media. Aniline effect on the compressive
strengths of the reinforced concrete samples was also investigated and reported. Varying
concentrations of the inhibitor were used and its performance improved as concentration
changed in NaCl medium, while no particular order of performance was noted in sulfuric
medium. In the statistically analyzed experimental results for each of the inhibitor
concentrations employed, 0.34 and 0.41 M aniline admixed samples are identified as
exhibiting the best inhibiting quality in sodium chloride while 0.14 M aniline was
predicted as showing the lowest probability of corrosion risk in sulfuric acid medium.
The overall effective inhibitive performance in sulfuric acid was less when compared to
the sodium chloride medium. Concrete sample admixed with 0.41 M aniline had the
highest improvement in compressive strength in both media.
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TP Chemical technology