Penetration properties and injecting conditions of corrosion inhibitor for concrete

Previous studies mainly focus on the anti-corrosion performance of corrosion inhibitor, and very limit study is done about the construction technology of application of corrosion inhibitors into hardened concrete. Here, an experiment was conducted to inject of corrosion inhibitors into concrete under sufficiently high pressure, measure the penetration properties of corrosion inhibitors and the nitrite ion concentrations at various regions in the concrete by utilizing penetration theory, and clarify the corrosion inhibition mechanisms, water permeability of concrete, and concentration ratios of nitrite ions to chloride ions. The results revealed that the water-cement ratio greatly influences the corrosion inhibitor; similar results were obtained with respect to water penetration. Based on these results, we proposed a predictive equation for the penetration of corrosion inhibitors and calculated the ratio of nitrite ions to chloride ions with a molar ratio of 0.6. Finally, the pressure and pressurizing time were proven to be crucial factors in measuring the nitrite ion concentration in concrete.