Analysis of the Influence of Organic Corrosion Inhibitors on Corrosion of Reinforcement in Concrete Bridge Structure Under Simulated Field Service Environment (original) (raw)
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A Review on the Application and Morphology of Organic Corrosion Inhibitors
Journal of Smart Science and Technology, 2021
Corrosion is a major challenge in construction technology and manufacturing industry. It does not only reduce the aesthetics of a building but also weakens the structure. Structural weakness caused by rust leads to the reduction in the durability of reinforced concrete. Various efforts and research ranging from prevention to maintenance process are being carried out globally to overcome this problem. Due to the increased awareness of the importance of preserving the environment for health and ecological system, studies are increasingly focused on the use of environmentally friendly corrosion inhibitor. This paper discusses several conditioning methods of using organic corrosion inhibitors in concrete reinforcement. It also takes a close look at the effect of every conditioning method towards the reinforced concrete strength and the mechanism to improve it. The migrating and admixed corrosion inhibitors (MCI) conditioning methods is considered as the best solution so far to enhance ...
Organic compounds as corrosion inhibitors for reinforced concrete: a review
Corrosion Reviews
With the goal of preventing concrete deterioration by means of destructive corrosion processes, the use of single organic compounds or mixtures as organic corrosion inhibitors (OCIs) instead of inorganic chemicals is becoming a very attractive practice. As OCIs are more ecologically friendly in their production and environmental fate, they have several advantages over well-known inorganic additives such as metallic nitrites, chromates, or arsenates. In this article, the application of different single organic compounds (of either natural or synthetic origin) as well as mixtures that have been used to lengthen the lifespan of concrete structures is reviewed. After a small exemplification of the use of single organic compounds bearing amino, hydroxy, formyl, or carboxylic functionalities, the more often used OCIs are reviewed according to their principal functional group. Afterward, the application of compound mixtures of either synthetic or natural origin, the use of natural extracts...
Asian Journal of Chemistry, 2023
Building industry is a rapid growing worldwide because of urbanization. Concrete is a primary requirement in the construction of residential buildings, shopping malls, industry structures, etc. The life of a building mainly depends on the ingredients used in the concrete during the construction activity. However, the concrete structures undergo deterioration because of the presence of highly corrosive ions in the admixture after long term. If the corrosion of the steel rods is severe in concrete, the buildings may collapse at any time which will lead to heavy loss for human lives. In this regard, protection of steel embedded in concrete from the corrosive attack is an important issue among civil engineering professionals and chemists. For this purpose, the technologies related to the adoption of suitable composition of steel, suitable combination of ingredients in the concrete, change of processing parameters/methodologies, etc. are being worked out. Apart from this, suitable chemical inhibitors are being studied across the globe to overcome this corrosion problem in a greater extent. In this review article, the type of chemical inhibitors used in admixtures and their effective role in protecting the concrete structures are discussed. Based on this, suitable suggestions are also recommended for the benefit of the society.
A study of organic substances as inhibitors for chloride-induced corrosion in concrete
Chloride-induced corrosion of carbon steel reinforcement is the most important cause of premature failure on reinforced concrete structures. Among available methods, corrosion inhibitors offer a simple and cost effective prevention technique, primarily to prevent and stop chloride-induced corrosion. Nevertheless, performance of commercial inhibitors is only partially satisfactory. This paper deals with a basic study on the inhibitive action of organic substances toward chloride-induced corrosion on carbon steel rebar in alkaline environment. The effect of aminic and carboxylic groups was investigated through electrochemical potentiodynamic polarisation tests in simulating concrete pore solution in the presence of chlorides, to ascertain inhibitor effectiveness to increase pitting potential. Results are discussed taking into account the most likely mechanism of inhibition, in relation to the functional group of tested organic compounds.
This paper deals with the effectiveness of corrosion inhibitors to reduce corrosion initiation of steel reinforcements in concrete structures. Nine organic substances have been selected in previous research: 2 amines, 4 amino-acids and 3 carboxylates compounds. Laboratory tests in concrete simulating solutions and chlorides containing concrete slabs are presented and discussed, on the basis of inhibitor functional group and chlorides content. Results are also discussed taking into account the most likely mechanism of inhibition effect and the influence of inhibitors on corrosion initiation time in term of increase of critical chlorides threshold.
Using Inhibitors for Preventions of Corrosion “Cancer” of Reinforced Concrete Constructions
Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering
Corrosion undermines the physical integrity of structures and can lead to destruction of property and loss of life. Chlorideinduced steel corrosion is one of the major worldwide deterioration problems for steel reinforced concrete structures. The use of green inhibitors in producing high performance concrete has increased significantly. The aim of our study was to investigate the efficiency of green inhibitor and migration inhibitor admixed in concrete. The concrete samples were exposed in aggressive media H2SO4 1M and 10-3 Cl-. As corrosion inhibitor we have used locust bean gum as a green inhibitor and methionine+butanolamine as migration inhibitor. Half-cell potential, polarization resistance and Tafel extrapolation methods are used for inhibitor efficiency testing. The results shows high resistance polarization and low corrosion rate for concrete sample with inhibitor. The corrosion rate decrease approximately 90% in presence of locust bean gum and 80% in presence of migration inhibitor
Accelerated laboratory and field investigations of corrosion inhibiting systems for concrete bridges
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Organic substances as corrosion inhibitors for steel in concrete – an overview
2016
Organic inhibitors have attracted considerable attention due to their promising application as admixtures in concrete protecting against corrosion of rebars. Over the last decade the use of those inhibitors significantly raised. The inhibition efficiency depends on their physical and chemical properties. This paper gives short overview of the protection of steel in concrete against the ingress of chlorides, oxygen and carbon dioxide in concrete, as species causing the corrosion of rebars. This work involves only organic inhibitors.
Indian Journal of Chemical Technology, 2007
Inorganic inhibitor like calcium nitrite is identified as an effective corrosion inhibiting admixture for rebar corrosion problem in concrete structures. But leaching of calcium nitrite results under dosage leading to pitting corrosion of rebars in presence of chloride. Hence the objective of the present investigation is to develop an alternative corrosion inhibiting system. Disodium phthalate is identified as an alternative system. The efficiency of the system was evaluated by conducting solubility limit test, gravimetric test, potentiodynamic polarization anodic passivation and electrochemical impedance studies. From the above tests conducted it was proven beyond doubt that the organic inhibitor studied may be considered as an effective corrosion inhibitor than the inorganic type.
Test of inhibitors for preventing corrosion of steel reinforcement in concrete
Ovidius University Annals of Chemistry
Concrete is more widely used than any other manmade material. The objective of this paper is to investigate the behavior of reinforced cement when migration corrosion and guar gum inhibitors are used. The concrete samples were exposed in aggressive media H2SO4 1 M and in the presence of 1∙10-3 M Cl-. Electrochemical measurements such as half-cell potential, polarization resistance and Tafel extrapolation methods were performed in order to obtain information on the corrosion behavior of the reinforcing steel in cement mortar. Results demonstrate high resistance polarization and low corrosion rate for concrete sample with inhibitor. The corrosion rate decreases approximately 95% in presence of locust bean gum and 80% in presence of migration inhibitor.