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Cleophas Akintoye Loto - One of the best experts on this subject based on the ideXlab platform.
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Investigating Potassium Chromate and Aniline Effect on Concrete Steel Rebar Degradation in Saline and Sulphate Media
2015Co-Authors: Olugbenga Adeshola Omotosho, Cleophas Akintoye Loto, Joshua Olusegun OkeniyiAbstract: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 th
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evaluation and analyses of rhizophora mangle l leaf extract corrosion mechanism on reinforcing Steel in concrete immersed in industrial microbial simulating environment
Journal of Applied Sciences, 2015Co-Authors: Joshua Olusegun Okeniyi, Cleophas Akintoye Loto, A. P. I. PopoolaAbstract:Test-data from electrochemical monitoring methods were obtained from Rhizophora mangle L. leaf-extract admixed Steel-reinforced concretes for detailing mechanism of the extract on Steel-Rebar corrosion in 0.5 M H2SO4 (simulating industrial/microbial environment). These electrochemical test-measurements, including corrosion potential, corrosion current and corrosion rate, were subjected to the analyses of probability distributions as per ASTM G16-95 R05 through the Kolmogorov-Smirnov goodness-of-fit test-statistics. Results showed that corrosion rate exhibited correlations with function of the natural plant-extract concentration and compact series of the inverse electrochemical noise resistance; the ratio of standard deviations of corrosion potential and corrosion current. Both the experimental and the correlated-prediction model identified Rhizophora mangle L. leaf-extract admixture concentrations that exhibited inhibition efficiency performance of η>70% on Steel-Rebar corrosion in the acidic test-medium. The adsorption isotherm modelling of the experimental and the predicted electrochemical test-results exhibited good agreements by following the Langmuir and Flory-Huggins isotherm fittings. In addition, the study identified physisorption as the prevalent corrosion-protection mechanism of the Steel-Rebar by the plant extract through both of the experimental and the correlated-prediction models of adsorption isotherm analyses.
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effect of nano2 and c6h15no3 synergistic admixtures on Steel Rebar corrosion in concrete immersed in aggressive environments
Advances in Materials Science and Engineering, 2015Co-Authors: Joshua Olusegun Okeniyi, Stanley Okechukwu Okpala, Cleophas Akintoye Loto, Olugbenga Adeshola Omotosho, A P I Popoola, Idemudia Joshua AmbroseAbstract:This paper studies effect of different combinations of NaNO2 (sodium nitrite) and C6H15NO3 (triethanolamine (TEA)), as synergistic admixtures in concrete immersed in NaCl and in H2SO4 test environments, on the corrosion of the concrete reinforcing Steel (Rebar). Although statistically analysed electrochemical test results confirmed NaNO2 effectiveness, synergistic combinations of 4 g NaNO2
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corrosion test data modeling for c 10 h 18 n 2 na 2 o 10 performance on Steel Rebar in nacl immersed concrete
Corrosion, 2015Co-Authors: Joshua Olusegun Okeniyi, A P I Popoola, Cleophas Akintoye LotoAbstract:This paper studies the empirical and correlation modeling of corrosion test-data for detailing C10H18N2Na2O10 (ethylenediaminetetraacetic disodium salt) performance on Steel-Rebar corrosion in 3.5% NaCl-immersed concrete. The corrosion test-data were measured using three non-destructive electrochemical-monitoring-techniques from duplicated samples of the NaCl-immersed Steel-reinforced concrete slabs admixed with different C10H18N2Na2O10 concentrations. Empirical data from these were subjected to statistical-distribution fitting analyses as per ASTM(1) G16-95 R04. Results revealed that corrosion rate from LPR technique correlated excellently (R2 = 90.85%; ANOVA p-value = 0.0174) with exponential function of C10H18N2Na2O10 molar-concentration and noise-resistance obtained from the other two techniques. Analyzed experimental data and correlation fitting predictions both identified, in agreements, the 0.0224M C10H18N2Na2O10 with optimal Steel-Rebar corrosion inhibition performance. Also, both experimental and correlated prediction models obeyed the Langmuir adsorption isotherm with excellent model-efficiencies, R2 = 99.94% (experimental) or R2 = 99.98% (predicted). Evaluated isotherm parameters from both models suggested favorable adsorption and predominant chemisorption mechanism by C10H18N2Na2O10 inhibitor of concrete Steel-Rebar corrosion in the saline/marine simulating environment. These bare implications that corrosion monitoring techniques that were technically simple to undertake exhibited correlation with corrosion rate from LPR and, by this, found suitability for indicating absolute corrosive activity of concrete Steel-Rebar in aggressive medium. © 2015 by Nace International.
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inhibition of Steel Rebar corrosion in industrial microbial simulating environment by morinda lucida
Solid State Phenomena, 2015Co-Authors: Joshua Olusegun Okeniyi, Cleophas Akintoye Loto, A. P. I. PopoolaAbstract:This paper studies inhibition of Steel-Rebar corrosion in concrete immersed in 0.5 M H2SO4, simulating industrial/microbial environment by the leaf extract of Morinda lucida. Electrochemical monitoring methods were employed for testing different concentrations of the leaf extract admixed in duplicated specimens of Steel-reinforced concrete slabs immersed in the acidic test-system. Statistical analyses as per ASTM G16-95 R04 of the experimental results showed that effectiveness of Morinda lucida at inhibiting concrete Steel-Rebar corrosion increased with the concentration of the admixture. 0.4167% Morinda lucida, per weight of cement, was identified with optimum inhibition efficiency η = 98.78±0.34% followed in effectiveness by 0.3333% Morinda lucida with η = 93.20±1.76% at inhibiting Steel-Rebar corrosion in the corrosive test-environment.
Joshua Olusegun Okeniyi - One of the best experts on this subject based on the ideXlab platform.
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bio characterisation of solanum aethiopicum leaf prospect on Steel Rebar total corrosion in chloride contaminated environment
Progress in Industrial Ecology An International Journal, 2016Co-Authors: Joshua Olusegun Okeniyi, Elizabeth Toyin Okeniyi, Taiwo Felicia OwoeyeAbstract:This paper investigates biochemical constituents of Solanum aethiopicum leaf, for its prospect on the total-corrosion reduction of concrete Steel-Rebar in the chloride-contaminated environment. Atomic absorption spectroscopy (AAS) and Fourier transform infra-red (FTIR) spectroscopy were used for assessment of inorganic and organic constituents of the leaf. Steel-Rebar total-corrosion was analysed, as per ASTM G109-99a, from macrocell-current measurements in 3.5% NaCl-immersed Steel-reinforced concrete samples that were admixed with different concentrations of the Solanum aethiopicum leaf-extract. By AAS, Solanum aethiopicum leaf was characterised of inorganic constituents Fe = 4645.50 μg/g, Pb = 74.1138 μg/g, Ni = 43.1162 μg/g, Cd = 6.8425 μg/g, Cu = 0.004581 μg/g and Cr = 0.0000 μg/g. By FTIR, the plant was characterised with S-, N-, O- (and a trace of Hg-) containing organic hetero-atoms. Also, the different concentrations of Solanum aethiopicum leaf-extract admixture studied reduced Steel-Rebar total-corrosion, with physisorption mechanism, in the 3.5% NaCl-immersed Steel-reinforced concrete specimens relative to a sample without admixture.
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Investigating Potassium Chromate and Aniline Effect on Concrete Steel Rebar Degradation in Saline and Sulphate Media
2015Co-Authors: Olugbenga Adeshola Omotosho, Cleophas Akintoye Loto, Joshua Olusegun OkeniyiAbstract: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 th
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evaluation and analyses of rhizophora mangle l leaf extract corrosion mechanism on reinforcing Steel in concrete immersed in industrial microbial simulating environment
Journal of Applied Sciences, 2015Co-Authors: Joshua Olusegun Okeniyi, Cleophas Akintoye Loto, A. P. I. PopoolaAbstract:Test-data from electrochemical monitoring methods were obtained from Rhizophora mangle L. leaf-extract admixed Steel-reinforced concretes for detailing mechanism of the extract on Steel-Rebar corrosion in 0.5 M H2SO4 (simulating industrial/microbial environment). These electrochemical test-measurements, including corrosion potential, corrosion current and corrosion rate, were subjected to the analyses of probability distributions as per ASTM G16-95 R05 through the Kolmogorov-Smirnov goodness-of-fit test-statistics. Results showed that corrosion rate exhibited correlations with function of the natural plant-extract concentration and compact series of the inverse electrochemical noise resistance; the ratio of standard deviations of corrosion potential and corrosion current. Both the experimental and the correlated-prediction model identified Rhizophora mangle L. leaf-extract admixture concentrations that exhibited inhibition efficiency performance of η>70% on Steel-Rebar corrosion in the acidic test-medium. The adsorption isotherm modelling of the experimental and the predicted electrochemical test-results exhibited good agreements by following the Langmuir and Flory-Huggins isotherm fittings. In addition, the study identified physisorption as the prevalent corrosion-protection mechanism of the Steel-Rebar by the plant extract through both of the experimental and the correlated-prediction models of adsorption isotherm analyses.
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investigating solanum aethiopicum leaf extract and sodium dichromate effects on Steel Rebar corrosion in saline marine simulating environment implications on sustainable alternative for environmentally hazardous inhibitor
2015Co-Authors: Joshua Olusegun Okeniyi, Adebanji Samuel Ogbiye, Olubanke Olujoke Ogunlana, Elizabeth Toyin OkeniyiAbstract:This paper investigates Solanum aethiopicum leaf-extract and the well-known but environmentally-hazardous sodium-dichromate inhibitor effects on concrete Steel-Rebar corrosion in 3.5% NaCl medium (simulating saline/marine environment). Different equal-concentration models (wt% cement) of the natural-plant leaf-extract and of sodium-dichromate were admixed in Steel-reinforced concrete slabs from which electrochemical test-measurements were obtained for comparing admixture performance. Test-results, analyzed as per ASTM G16-95 R04, showed that only the 0.083% sodium-dichromate admixture outperformed the 0.083% Solanum aethiopicum leaf-extract in corrosion-inhibition effectiveness. The other natural-plant leaf-extract exhibited better inhibition-efficiency performance than their equal-concentration models of sodium-dichromate. The 0.25% Solanum aethiopicum leaf-extract exhibited optimal performance, η = 98.28%, at inhibiting Steel-Rebar corrosion among the also effective different concentrations of the plant-extract and of sodium-dichromate admixtures employed. These and phytochemical test-results bare indications that Solanum aethiopicum leaf-extract is a suitable, sustainable and eco-friendly alternative for the environmentally-hazardous sodium-dichromate inhibitor of Steel-Rebar corrosion in concrete designed for saline/marine environments.
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effect of nano2 and c6h15no3 synergistic admixtures on Steel Rebar corrosion in concrete immersed in aggressive environments
Advances in Materials Science and Engineering, 2015Co-Authors: Joshua Olusegun Okeniyi, Stanley Okechukwu Okpala, Cleophas Akintoye Loto, Olugbenga Adeshola Omotosho, A P I Popoola, Idemudia Joshua AmbroseAbstract:This paper studies effect of different combinations of NaNO2 (sodium nitrite) and C6H15NO3 (triethanolamine (TEA)), as synergistic admixtures in concrete immersed in NaCl and in H2SO4 test environments, on the corrosion of the concrete reinforcing Steel (Rebar). Although statistically analysed electrochemical test results confirmed NaNO2 effectiveness, synergistic combinations of 4 g NaNO2
Viruthasalam Maruthapandian - One of the best experts on this subject based on the ideXlab platform.
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development of solid state embeddable reference electrode for corrosion monitoring of Steel in reinforced concrete structures
Cement & Concrete Composites, 2016Co-Authors: Viruthasalam Maruthapandian, Velu Saraswathy, S MuralidharanAbstract:Abstract Corrosion of Steel reinforcement concrete structures is monitored through the surface mounting techniques using liquid based reference electrodes. Due to the limited usage of liquid based reference electrodes solid state reference electrode are introduced recently. In the present study, we fabricated and characterized Mn 3 O 4 based pellet electrode for corrosion assessment of Steel Rebar in high alkaline medium through electrochemical methods and the results are compared with conventional saturated calomel reference electrode (SCE). The results indicate that the fabricated pellet electrode exhibits better characteristics suitable for high alkaline concrete environment and differentiate the passive and active status of Steel Rebar.
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spinel nife2o4 based solid state embeddable reference electrode for corrosion monitoring of reinforced concrete structures
Construction and Building Materials, 2016Co-Authors: Viruthasalam Maruthapandian, S Muralidharan, Velu SaraswathyAbstract:Abstract In this study, solid state embeddable reference electrode was fabricated and examined for their potential stability in high alkaline environment for the application of corrosion monitoring in reinforced concrete structure. Further, the fabricated solid state reference electrodes (SSREs) were studied in the presence and absence of chloride ion in aqueous solution in order to ensure their potential stability. The results showed that the fabricated SSRE gave stable potential in alkaline medium even in the presence of chloride ions. Steel Rebar corrosion assessment studies were carried out in alkaline solution and real concrete medium using the fabricated SSRE and the results were compared with conventional saturated calomel electrode (SCE). The results indicate that the fabricated SSREs have the ability to differentiate the passive and active state of Steel Rebar similar to SCE.
Velu Saraswathy - One of the best experts on this subject based on the ideXlab platform.
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development of solid state embeddable reference electrode for corrosion monitoring of Steel in reinforced concrete structures
Cement & Concrete Composites, 2016Co-Authors: Viruthasalam Maruthapandian, Velu Saraswathy, S MuralidharanAbstract:Abstract Corrosion of Steel reinforcement concrete structures is monitored through the surface mounting techniques using liquid based reference electrodes. Due to the limited usage of liquid based reference electrodes solid state reference electrode are introduced recently. In the present study, we fabricated and characterized Mn 3 O 4 based pellet electrode for corrosion assessment of Steel Rebar in high alkaline medium through electrochemical methods and the results are compared with conventional saturated calomel reference electrode (SCE). The results indicate that the fabricated pellet electrode exhibits better characteristics suitable for high alkaline concrete environment and differentiate the passive and active status of Steel Rebar.
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spinel nife2o4 based solid state embeddable reference electrode for corrosion monitoring of reinforced concrete structures
Construction and Building Materials, 2016Co-Authors: Viruthasalam Maruthapandian, S Muralidharan, Velu SaraswathyAbstract:Abstract In this study, solid state embeddable reference electrode was fabricated and examined for their potential stability in high alkaline environment for the application of corrosion monitoring in reinforced concrete structure. Further, the fabricated solid state reference electrodes (SSREs) were studied in the presence and absence of chloride ion in aqueous solution in order to ensure their potential stability. The results showed that the fabricated SSRE gave stable potential in alkaline medium even in the presence of chloride ions. Steel Rebar corrosion assessment studies were carried out in alkaline solution and real concrete medium using the fabricated SSRE and the results were compared with conventional saturated calomel electrode (SCE). The results indicate that the fabricated SSREs have the ability to differentiate the passive and active state of Steel Rebar similar to SCE.
S Muralidharan - One of the best experts on this subject based on the ideXlab platform.
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development of solid state embeddable reference electrode for corrosion monitoring of Steel in reinforced concrete structures
Cement & Concrete Composites, 2016Co-Authors: Viruthasalam Maruthapandian, Velu Saraswathy, S MuralidharanAbstract:Abstract Corrosion of Steel reinforcement concrete structures is monitored through the surface mounting techniques using liquid based reference electrodes. Due to the limited usage of liquid based reference electrodes solid state reference electrode are introduced recently. In the present study, we fabricated and characterized Mn 3 O 4 based pellet electrode for corrosion assessment of Steel Rebar in high alkaline medium through electrochemical methods and the results are compared with conventional saturated calomel reference electrode (SCE). The results indicate that the fabricated pellet electrode exhibits better characteristics suitable for high alkaline concrete environment and differentiate the passive and active status of Steel Rebar.
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spinel nife2o4 based solid state embeddable reference electrode for corrosion monitoring of reinforced concrete structures
Construction and Building Materials, 2016Co-Authors: Viruthasalam Maruthapandian, S Muralidharan, Velu SaraswathyAbstract:Abstract In this study, solid state embeddable reference electrode was fabricated and examined for their potential stability in high alkaline environment for the application of corrosion monitoring in reinforced concrete structure. Further, the fabricated solid state reference electrodes (SSREs) were studied in the presence and absence of chloride ion in aqueous solution in order to ensure their potential stability. The results showed that the fabricated SSRE gave stable potential in alkaline medium even in the presence of chloride ions. Steel Rebar corrosion assessment studies were carried out in alkaline solution and real concrete medium using the fabricated SSRE and the results were compared with conventional saturated calomel electrode (SCE). The results indicate that the fabricated SSREs have the ability to differentiate the passive and active state of Steel Rebar similar to SCE.
