Studying chloride ions and corrosion properties of reinforced concrete with a green inhibitor and plasticizers

Abstract

The breakthrough and diffusion of chloride ions into reinforced concrete structures is the major contributing factor for inducing corrosion of the steel reinforcement. This work presents a study of the total chloride contents in concrete and the corrosion process by testing electrical resistivity and half-cell potential of concrete samples. The novelty of this work in the use of a green inhibitor-orange peel extract. The analysis was based on an experimental investigation of the samples with time of immersion in 3.5 wt% NaCl aqueous solutions at room temperature according to European Standards. For this study, different mixtures of concrete were prepared by adding two types of superplastisizers and green inhibitors in different concentrations. The results of the Cl − ions test showed that all the samples (except sample C2) after an immersion testing period of 6 months contained Cl − ions in high concentrations, indicating a greater risk of corrosion. Sample C2 (with green inhibitor and Oxydtron superplasticizer) showed the highest resistance against the chloride ion ingress measured by following the Cl − concentration changes up to the end of the 6 months testing period. This samples' good resistance to corrosion in the tested environment was also proved by the results of several sets of measurements of the electrical resistivity and half-cell potentials carried on the concrete test samples.

Analysis of corrosion rate, inhibition efficiency, and economic cost of XD3 reinforced concrete related to inhibitor and plasticiser types

“…Corrosion inhibitors, the most popular of these techniques, are easy to apply and very affordable. Inhibitors prevent corrosion by increasing the pH of the concrete or eliminating dangerous ions that might corrode steel [23][24][25].…”

Effect of the dosage of MWCNT's on deterioration resistant of concrete subjected to combined freeze–thaw cycles and sulfate attack

“…The durability and service life of concrete affected by many factors, such as carbonation, sulfate corrosion, alkali polymerization expansion, heating and cooling cycle, freeze–thaw cycle, wet‐dry cycle, steel corrosion etc 1–7 . However, the soil in many cold areas is rich in sulfate ions, the deterioration of concrete structure in these areas is ascribe to external sulfate erosion and freeze–thaw cycles 8–12 . Several studies on performance and durability of concrete materials and structures under freeze–thaw cycles or chloride ion erosion have been studied 13–17 .…”