Effect of NaNO2 and C6H15NO3 synergistic admixtures on steel-rebar corrosion in concrete immersed in aggressive environments.
Okeniyi, Joshua Olusegun Popoola, Abimbola Patricia Idowu Loto, Cleophas Akintoye Omotosho, Olugbenga Adeshola Okpala, Stanley Okechukwu Ambrose, Idemudia Joshua
Okeniyi, Joshua Olusegun
Popoola, Abimbola Patricia Idowu
Loto, Cleophas Akintoye
Omotosho, Olugbenga Adeshola
Okpala, Stanley Okechukwu
Ambrose, Idemudia Joshua
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Abstract
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 +4gC6H15NO3 in NaCl medium and of 2 g NaNO2 +6gC6H15NO3 in H2SO4 medium were also highly effective at inhibiting rebar corrosion. Synergistic parameter analyses showed that the effective synergistic admixtures that inhibited concrete steel-rebar corrosion in their respective medium were the NaNO2 and C6H15NO3 combinations that exhibited synergistic interactions of cooperative adsorption on steel-rebar. These support the suitability of requisite concentration of triethanolamine as additive admixture with sodium nitrite for steel-rebar corrosion mitigation, which is potent with reduced environmental effects, in concrete immersed in NaCl and in H2SO4 corrosive media.
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Date
2015-03-02
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Wiley
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Keywords
NaNO2 and C6H15NO3, NaCl and in H2SO4, 2 g NaNO2 +6gC6H15NO3 in H2SO4