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51315-5636-Performance of Rhizophora Mangle L. Leaf-Extract and Sodium Dichromate Synergies on Steel-reinforcement Corrosion in 0.5 M H?SO?-Immersed Concrete

Picture for Performance of Rhizophora Mangle L. Leaf-Extract and Sodium Dichromate Synergies on Steel-reinforcem
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Product Number: 51315-5636-SG
ISBN: 5636 2015 CP
Author: Joshua Okeniyi
Publication Date: 2015
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Performance of different synergistic combinations of Rhizophora mangle L leaf-extract and sodium dichromate (Na2Cr2O7) admixtures on the corrosion of reinforcing-steel embedment in concrete immersed in 0.5 M H2SO4 medium were investigated in this paper. Non-destructive electrochemical measurements of corrosion rate (CR) and open circuit potential (OCP) were obtained for assessing steel-reinforcement corrosion in concrete slabs that were partially immersed in the microbial/industrial simulating test-environment. Probability distribution function (pdf) analyses as prescribed by ASTM G16-95 R04 of the scatter of corrosion test-data showed that while datasets of OCP distributed like the Normal the Gumbel and Weibull pdf’s the datasets of CR were best fitted by the Weibull pdf. Results from these identified the synergistic admixture of 6 g Rhizophora mangle L leaf-extract + 2 g Na2Cr2O7 with both optimal inhibition efficiency ? = 90.12% and synergistic parameter that indicated excellent synergistic interaction of the plant extract with Na2Cr2O7 chemical. That this synergistic admixture out-performed the also effective Na2Cr2O7 admixtures in the study bear suggestions of the suitability ofRhizophora mangle L leaf-extract as eco-friendly replacement of toxic Na2Cr2O7 inhibitor in H2SO4-immersed steel-reinforced concrete. This is potent with the advantage of reducing environment effect from lower Na2Cr2O4 usage in the control of corrosion in steel-reinforced concretes for the microbial/industrial environment.
Performance of different synergistic combinations of Rhizophora mangle L leaf-extract and sodium dichromate (Na2Cr2O7) admixtures on the corrosion of reinforcing-steel embedment in concrete immersed in 0.5 M H2SO4 medium were investigated in this paper. Non-destructive electrochemical measurements of corrosion rate (CR) and open circuit potential (OCP) were obtained for assessing steel-reinforcement corrosion in concrete slabs that were partially immersed in the microbial/industrial simulating test-environment. Probability distribution function (pdf) analyses as prescribed by ASTM G16-95 R04 of the scatter of corrosion test-data showed that while datasets of OCP distributed like the Normal the Gumbel and Weibull pdf’s the datasets of CR were best fitted by the Weibull pdf. Results from these identified the synergistic admixture of 6 g Rhizophora mangle L leaf-extract + 2 g Na2Cr2O7 with both optimal inhibition efficiency ? = 90.12% and synergistic parameter that indicated excellent synergistic interaction of the plant extract with Na2Cr2O7 chemical. That this synergistic admixture out-performed the also effective Na2Cr2O7 admixtures in the study bear suggestions of the suitability ofRhizophora mangle L leaf-extract as eco-friendly replacement of toxic Na2Cr2O7 inhibitor in H2SO4-immersed steel-reinforced concrete. This is potent with the advantage of reducing environment effect from lower Na2Cr2O4 usage in the control of corrosion in steel-reinforced concretes for the microbial/industrial environment.
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51315-5590-Corrosion Test-data Modelling for C10H18N2Na2O10 Performance on Steel-rebar in 3.5% NaCl-immersed Concrete

Product Number: 51315-5590-SG
ISBN: 5590 2015 CP
Author: Joshua Okeniyi
Publication Date: 2015
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This paper studies empirical and correlation modelling of corrosion test-data for detailing C10H18N2Na2O10 (ethylenediaminetetraacetic disodium salt: EDTA-Na2) performance on concrete steel-rebar corrosion in 3.5% NaCl medium simulating saline/marine environment.
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51313-02117-Corrosion of Underwater Reinforced Concrete Tunnel Structures

Product Number: 51313-02117-SG
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04284 Long-Term Performance of Steel in Concrete Immersed in Sea Water

Product Number: 51300-04284-SG
ISBN: 04284 2004 CP
Author: Del Hausmann, DA Hausmann Consulting
Publication Date: 2004
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Twelve-year laboratory tests of rebar reinforced concrete beams partially submerged in artificial seawater have confirmed that steel corrosion may occur a few months after immersion and may continue for many years.
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