Abstract
Very limited guidelines are available on the use of corrosion resistant inhibitors as a constituent material in concrete due to availability of statistics on its corrosion inhibiting efficiency. So the study is conducted on the M25 grade concrete mixed with few selected corrosion inhibitors of organic and non-organic nature to comprehend the impact of these corrosion inhibitors on the conductivity of electricity in these concretes. Based on the other researchers’ work, four well know corrosion inhibitors such as Calcium nitrate, Di-ethanolamine, Sodium nitrite and Hexamine and are chosen for study. Dosages of 1%, 2%, 3%, 4% and 5% the weight of cement are chosen. Measured electrical resistivity and half-cell potential values of all corrosion inhibitors admixed M25 grade concrete mixes indicates the superior corrosion inhibition ability of calcium nitrate and Di-ethanolamine’s with shows high electrical resistance.
Highlights
The best generally implemented method to mitigate the corrosion of the rebars in concrete structures is applying epoxy or zinc coating on the rebars or by coating with water repellent agents, or regulating the water/cement ratio or by adopting sufficient cover thickness or by coating with chemicals or by using cathodic protection etc
Experts suggest practice of supplementary cementitious materials (SCMs) as concrete admixtures which offers a worthy solution for deterring corrosion in rebars
This test may relatively indicate the degree of corrosion in reinforced concrete structures based on oxidizing half-cell potentials measured with respect to a reference electrode which can be correlated to corrosion inhibition ability of calcium nitrite, sodium nitrite, hexamine and diethanolamine in rebar concretes
Summary
The best generally implemented method to mitigate the corrosion of the rebars in concrete structures is applying epoxy or zinc coating on the rebars or by coating with water repellent agents, or regulating the water/cement ratio or by adopting sufficient cover thickness or by coating with chemicals or by using cathodic protection etc. The cost-effective and recently accepted practice is to prevent the rebar corrosion in concrete is admixed concrete with corrosion inhibiting agents. It is postulated that the concrete admixed with corrosion inhibitors will deter the start of corrosion and effects the properties of concrete in a big way. The corrosion admixtures’ inhibitive properties can be assessed in the laboratory using electrical resistivity and half-cell potential measurements. The effect of inhibitors is governed principally by the molarity or the concentration of inhibitors’. If the molarity is high the effect of inhibiting corrosion is significant. © The Authors, published by EDP Sciences. Organic type in terms of resistivity measurements and potentials measurements of M25 grade reinforced concrete specimens
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