Journal ArticleDOI
Anodic corrosion inhibitors against chloride induced corrosion of concrete rebars
T A Østnor,H Justnes +1 more
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In this article, the effect of anodic inhibitors (calcium nitrate Ca(NO3)2, calcium nitrite Ca( NO2)2 and potassium nitrate NaNO2) on the half cell potentials of steel rebars was evaluated in the marine tidal zone, at roof top and in air of 38°C and 90% relative humidity for 4 years.Abstract:
The effect of anodic inhibitors [calcium nitrate Ca(NO3)2, calcium nitrite Ca(NO2)2 and potassium nitrate NaNO2] has been evaluated using cylinders with steel rebars exposed to the following environments: in the marine tidal zone, at roof top and in air of 38°C and 90% relative humidity for 4 years. The experiments showed that the half cell potentials were more negative than the visual inspections proved when anodic inhibitors are used. Inhibitor dosage on 3–4% of cement weight seems sufficient to protect the rebar against corrosion. Capillary absorption experiments showed that the concrete porosity was unaffected by the inhibitors. The concentration profiles of chloride, nitrite and nitrate were investigated with respect to leaching. However, it was difficult to find the background level of nitrite due to possible chemical alteration.read more
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Corrosion of steel by concrete
TL;DR: In this paper, the authors examined the reactions of various concretes on steel reinforcement and concluded that the most significant influences on the corrosion of prestressing wire in concrete are: the presence of chloride, presence of nitrates, the composition of concrete, the degree of carbonation of the concrete; concrete compaction and chlorides and sulphates should be used as far as possible when steel is embedded.
Journal ArticleDOI
A review on the deterioration and approaches to enhance the durability of concrete in the marine environment
TL;DR: In this article, a review of the deterioration of concrete under seawater attack with particular interests in field exposure is presented, and the protocols to enhance the durability performance of marine concrete are also reviewed, such as using supplementary cementitious materials (SCMs) to mitigate rate of chloride penetration and, more promisingly, to use alternative binder systems.
Journal ArticleDOI
Preparation of MgAl layered double hydroxides intercalated with nitrite ions and corrosion protection of steel bars in simulated carbonated concrete pore solution
TL;DR: In this article, Mg-Al layered double hydroxides intercalated with nitrite ions were prepared by three different methods: calcined-rehydration (R-LDH), hydrothermal (H-LHDH), and coprecipitation (C-LDH) method.
Journal ArticleDOI
Effects of phosphate on the chloride-induced corrosion behavior of reinforcing steel in mortars
Jinjie Shi,Weifeng Sun +1 more
TL;DR: In this paper, the influence of phosphate as a corrosion inhibitor on the corrosion behavior of as-received and pre-rusted reinforcing steels in mortar specimens was investigated after 360 days exposure in 3.5% NaCl solution.
Journal ArticleDOI
Influence of pH on the nitrite corrosion inhibition of reinforcing steel in simulated concrete pore solution
TL;DR: In this article, a significant corrosion inhibition has been observed at relatively low chloride contents of 0.045 M due to the presence of nitrite in these systems, but its efficiency decreases when the pH is reduced.
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Journal Article
Corrosion of steel by concrete
TL;DR: In this paper, the authors examined the reactions of various concretes on steel reinforcement and concluded that the most significant influences on the corrosion of prestressing wire in concrete are: the presence of chloride, presence of nitrates, the composition of concrete, the degree of carbonation of the concrete; concrete compaction and chlorides and sulphates should be used as far as possible when steel is embedded.
Journal ArticleDOI
Corrosion inhibitors for steel in concrete: State-of-the-art report
T. A. Söylev,Mark G. Richardson +1 more
TL;DR: In this article, a state-of-the-art report is focused on corrosion inhibitors used in concrete and is based on published studies in the last decade, focusing on the most commonly used inhibitors such as amino alcohols (AMAs), calcium nitrites (CN), and sodium monofluorophosphates (MFPs).
Journal ArticleDOI
Chemistry of corrosion inhibitors
TL;DR: In this article, the chemical reactions of the corrosion process in concrete and of the most commonly used inhibitors are discussed, with special attention to test procedures and practical issues arising from use of inhibitors.
Reference EntryDOI
Corrosion of Steel in Concrete
TL;DR: In this paper, the authors discuss the potential of chloride-induced corrosion in reinforced concrete structures and propose a number of preventive measures to prevent such a scenario.
Journal ArticleDOI
Predicting long-term durability of steel reinforced concrete with calcium nitrite corrosion inhibitor
Neal S. Berke,Maria C. Hicks +1 more
TL;DR: In this article, the levels of chloride to which given levels of calcium nitrite will protect steel reinforced concrete from chloride induced corrosion is analyzed and it is shown that once corrosion initiates, the rates are lower with calcium Nitrite present.