Effect of NaNO2 and C6H15NO3 SynergisticAdmixtures on Steel-Rebar Corrosion in Concrete Immersed in Aggressive Environments

Abstract

This paper studies effect of different combinations of NaNO(sodium nitrite) and CO(triethanolamine (TEA)), as synergistic admixtures in concrete immersed in NaCl and in HOtest environments, on the corrosion of the concrete reinforcing steel (rebar). Although statistically analysed electrochemical test results confirmed NaNOeffectiveness, synergistic combinations of 4 g NaNO+ 4 g COin NaCl medium and of 2 g NaNO+ 6 g COin HOmedium 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 NaNOand COcombinations 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 HOcorrosive media.