Effect of calcium nitrite-based corrosion inhibitor in preventing corrosion of embedded steel in concrete

Ann, Ki Yong; Jung, Hye-Mi; Kim, H.S.; Kim, S.S.; Moon, Han-Young

doi:10.1016/j.cemconres.2005.09.003

Cited by 179 publications

(84 citation statements)

References 6 publications

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“…Diversos pesquisadores [8,9,10,11] realizaram medidas de potencial em corpos-de-prova de concreto armado, viabilizando e confirmando a possibilidade de leituras precisas e de pouca variação. Neste trabalho também foram adotados corpos-de-prova de concreto armado.…”

Section: Amostras Para Medidas De Potencialunclassified

Estudo de inibidores de corrosão em concreto armado

et al. 2010

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A corrosão é um fenômeno que afeta toda a sociedade, atribuindo-se uma grande importância sócio-econômica aos seus efeitos. Na área da engenharia, existem diversas conseqüências do processo corrosivo, como ocorre no aço de reforço das estruturas de concreto. Na intenção de oferecer segurança e durabilidade às estruturas, empresas do ramo químico e de produtos para construção civil disponibilizam no mercado diferentes formas de proteção à corrosão. Este trabalho apresenta análises de medidas de potencial realizadas em amostras de concreto armado, com diferentes relações água/cimento, produzidos com e sem inibidores de corrosão e expostos a dois ambientes com cloretos: em campo, exposto às intempéries da atmosfera marinha do litoral sul de Santa Catarina; em laboratório, a um processo cíclico de aceleração da corrosão através de imersão parcial (solução contendo cloretos) e secagem em estufa. Nas duas situações, foram mantidas as amostras por um período de 63 dias. A corrosão por cloretos em laboratório mostrou-se o sistema mais agressivo e eficiente para avaliar o potencial de corrosão. Os resultados buscaram caracterizar a eficiência dos inibidores de corrosão utilizados, que foram denominados de inibidor A, inibidor B e inibidor C e, ao fim das análises, foi possível classificá-los quanto ao desempenho em ambientes contaminados por cloretos em: Inibidor B > Inibidor C > Inibidor A. A redução da relação água/cimento (0,45) melhorou o desempenho do concreto de referência e dos três tipos de inibidores de corrosão utilizados. Evidenciou-se modificação das propriedades mecânicas dos concretos com inibidores, o que pode conduzir ao desenvolvimento de concretos mais impermeáveis e duráveis. Palavras-chaves:Aditivos químicos, Inibidores de corrosão, estruturas de concreto. Corrosion inhibitors study in steel-reinforced concrete ABSTRACTCorrosion is a phenomenon that affects the whole of society, such that great socioeconomic importance is attributed to its effects. In the area of the engineering, numerous consequences of the corrosive process exist, like that which occurs in steel reinforcement of concrete structures. With the intention of providing structural safety and durability, the chemical industry and companies that supply construction products market different forms of protection against corrosion. This work presents analyses of measurements of corrosive potential conducted on samples of steel-reinforced concrete, with different water/cement ratios, fabricated with and without corrosion inhibitor and exposed to two environments containing chloride: in the field, exposed to the unpredictable weather of the marine environment of the southern coastal region of Santa Catarina; and in the laboratory, exposed to a cyclical process of corrosion acceleration through partial immersion (solution containing chloride) and drying in a heater. The specimens were maintained for a period of 63 days in the respective environments. Corrosion by chloride solution in the laboratory proved to be the most aggressive and efficient s...

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Section: Amostras Para Medidas De Potencialunclassified

Estudo de inibidores de corrosão em concreto armado

et al. 2010

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“…Calcium nitritebased raises the compressive strength at early ages when compare to control non chloride contaminated sample. However, at 900 days, the strength trends reverse (Ann et al, 2006). In addition, an increase in the dosage of corrosion inhibitor resulted in decreased concrete setting by about 1 h, when 12 l/m 3 inhibitor was added.…”

Section: Inorganic Inhibitorsmentioning

confidence: 99%

“…However, the combination of good quality concrete (w/c = 0.29 or 0.37) and the use of CNI at an addition rate of 12.5 L/m 3 plus the use of 20% of fly ash appears to be the desirable approach to reduce the effect of chloride induced corrosion of steel reinforcement. Ann et al (2006) used calcium nitrite-based corrosion inhibitors to investigate the effects on the chloride transport, compressive strength and setting of concrete. Their conclusions are as follows: the corrosion rate reduced considerably by the addition of corrosion inhibitor at all levels of chloride ions in mortar and the chloride threshold level was raised by an increase in the dosage of corrosion inhibitor, ranging from 0.22 to 1.95% by weight of cement.…”

Section: Inorganic Inhibitorsmentioning

confidence: 99%

Corrosion inhibitors for steel reinforcement in concrete: A review

Abdulrahman¹,

Ismail²,

Hussain³

2011

Sci. Res. Essays

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Inhibitors are added to concrete to improve its quality and integrity. In recent years the use of these inhibitors in producing high performance concrete has increased significantly as a result of aggressive environment. This report is based on the corrosion inhibitors used in concrete and also on the published literatures. Most authors agreed that reinforcement corrosion is the most important causes of premature failure of reinforced concrete structure worldwide and generate a great research concern due to its effects on global economy. The report presents information related to basic mechanism of corrosion protection methods to extend the service life of reinforced concrete structures which include inhibitors, sealers and barriers. Environmental sustainability issues concerning the present inhibitors being used were examined, viability and versatility of green inhibitors to concrete was also x-rayed.

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“…When Cl -and NO 2 -exist in the cement paste, Cl -will react with AFm to form Friedel's salt, and NO 2 -will react with AFm to form NO 2 -AFm. Another bound form is when the ions are physically adsorbed into the surface of a hydration product, such as calcium silicate hydrate gel C-S-H [20][21][22][23]. Figure 1 is a contrast graph: It shows the free-form NO 2 -concentration of cement paste specimens with 0.5%, 1.0%, 1.5%, and 2.0% NO 2,…”

Section: Effect Of Erosion CLmentioning

confidence: 99%

Effect of Chloride Ion on Free Nitrite Ion in Cement

Xing

Liu

Dai

et al. 2018

International Journal of Corrosion

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This was an experiment in which chloride was externally permeated into cement paste. The influence of Cl -on the content and distribution of free-form NO 2 -in the cement paste was researched using the chemical quantitative analysis method. The action mechanism was investigated by the micro-means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the physical competitive adsorption of Cl -with NO 2 -on C-S-H and the chemical substitution of Cl -to NO 2 -AFm caused more free-form NO 2 -in the cement paste. In the cement paste with chloride salt erosion, the NO 2 -concentration in the erosion surface was the lowest, and the NO 2 -concentration reached the highest value at 10mm from the erosion surface. The concentration decreased gradually with the depth from the erosion surface.

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Effect of calcium nitrite-based corrosion inhibitor in preventing corrosion of embedded steel in concrete

Cited by 179 publications

References 6 publications

Estudo de inibidores de corrosão em concreto armado

Estudo de inibidores de corrosão em concreto armado

Corrosion inhibitors for steel reinforcement in concrete: A review

Effect of Chloride Ion on Free Nitrite Ion in Cement

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