Investigating Potassium Chromate and Aniline Effect on Concrete Steel Rebar Degradation in Saline and Sulphate Media

• Published in: International journal of electrochemical science Vol. 9; no. 4; pp. 2171 - 2185
• Main Authors: Omotosho, O.A., Loto, C.A., Ajayi, O.O., Okeniyi, J.O., Popoola, A.P.I.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2014
• Subjects: and marine/sewage media; aniline; compressive strength; Corresponding author: Tel+2348033382752; Kolmogorov-Smirnov statistics; Open circuit potential; potassium chromate; steel rebar; Weibull distribution; Corresponding author: Tel+2348033382752; Open circuit potential
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)07919-1

Potential monitoring experiments were performed on steel rebars embedded in concrete admixed with potassium chromate, aniline and their synergetic combinations with fixed amount of sodium chloride salt partially immersed in sulphuric acid and sodium chloride solution. Two-sets of fifteen steel-rebar concrete specimens were employed for the study and potential readings were taken in accordance with ASTM C 876. Quality and consistency of the inhibitor was then estimated by the Weibull probability density distribution as an extreme value statistical modeling approach to study the efficacy and predict the most efficient inhibitor concentration in each media. The effect of the inhibitors on the compressive strengths of the test samples was also conducted. Results revealed that test sample admixed with 0.15M potassium chromate partially immersed in sulphuric acid medium exhibited the best overall performance while 0.34M aniline admixture was identified as exhibiting the best performance in the sodium chloride medium. The results also show that the admixture combination of 0.15M potassium chromate and 0.07M aniline in the sodium chloride medium produced the best result amongst the synergistic combination used. Control sample in the saline medium gave the highest increase in compressive strength (330KN) amongst all the samples considered. Also, in the NaCl medium the 0.14M aniline admixture gave the highest increase in compressive strength amongst the inhibited samples. However, the 0.41M aniline admixture gave the highest increase in compressive strength amongst all the samples considered in the H2SO4 medium.