Protection Systems for Reinforced Concrete with Corrosion Inhibitors

Abstract

This paper examines the use of corrosion inhibitors in order to protect the reinforcement of concrete. For this purpose mortar specimens were constructed with or without corrosion inhibitors and were partially immersed in sodium chloride. Corrosion inhibitors were used as admixture into concrete and were sprayed on the external surface of mortar specimens. In all mortar specimens, electric junction between reinforcements was achieved. The methods that were used for the evaluation of the reinforcement corrosion in concrete, included half-cell potential measurements, polarization curves of reinforced rebars and mass loss of the reinforcement. Finally, the durability of concrete after the use of corrosion inhibitors was also examined.

Effect of Surface Applied Organic and Inorganic Corrosion Inhibitors on Reinforced Steel in Concrete

“…To check the grade of concrete compressive strength of cubes was tested. Further to check the effect of corrosion inhibitors Half-cell potential and Weight loss measurements were carried out [7,8]. These are the direct methods for checking the rate of corrosion Increase in weight loss shows the degradation of bras.…”

“…E corr . The difference in voltage between rebar with concrete around it and a reference electrode gives the corrosion potential [7,8]. Half-cell potentiometer consisting of copper sulphate half-cell as reference electrode is used to monitor the corrosion potential in the present research work.…”

Effect of Organic Coating Corrosion Inhibitor on Protection of Reinforced Mortar

“…A thin surface layer of hydrated iron oxide is created upon the reinforcement, which due to the high alkalinity (pH = 12.5 -13.5) οf the concrete leads to protect the reinforcement steel from corrosion [1]. However, the exposure of the reinforced concrete in a corrosive environment such as chloride ions (Cl − ) or carbon dioxide (CO 2 ), may cause a decomposition/cracking of the passive film upon the steel surface and the corrosion of the steel reinforcement [2].…”

Accelerated corrosion performance of AISI 316L stainless steel concrete reinforcement used in restoration works of ancient monuments

“…Reinforced concrete is currently the most predominant material used for the construction of the load bearing elements of structures, as it is economical, versatile, exhibits long lifetime, high mechanical properties and durability [1][2][3][4]. Although it performs very well during its service life, the rapid deterioration of the construction service life and seismic resistance due to corrosion of the steel reinforcement is nowadays a critical problem.…”

“…Corrosion is due to either chloride penetration into the concrete through its pores or concrete carbonation (by the reaction between atmospheric CO 2 and Ca(OH) 2 ). Both mechanisms cause localized corrosion and depassivation of the protective oxide film of the steel rebar [3][4][5][6][7][8][9][10][11]. Corrosion affects not only the appearance of the structure, but also its strength and safety, with subsequent reduction of the reinforcement cross-sectional area and mechanical properties; this way, both the overall structure performance and the surrounding concrete/steel bond strength deteriorate [5,8,12,13].…”