Corrosion inhibitor systems for remedial treatment of reinforced concrete. Part 1: calcium nitrite

Ngala, V. T.; Page, Christopher; Page, M.M.

doi:10.1016/s0010-938x(02)00012-4

Cited by 102 publications

(48 citation statements)

References 8 publications

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“…Three types of sample containing inhibitor ions were examined by means of ion chromatography: (a) solutions obtained by water extraction of powdered samples taken from different depths within concrete or cement paste specimens [14,16,17]; (b) pore liquid expressed from cement paste as described elsewhere [18,19]; and (c) solutions containing standard cations and spiked with inhibitor ions.…”

Section: Methodsmentioning

confidence: 99%

Ion chromatographic analysis of amines, alkanolamines, and associated anions in concrete

Page

Shaw

et al. 2005

J of Separation Science

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In order to assess the effectiveness of applying penetrating corrosion inhibitors to the surface of reinforced concrete, it is necessary to devise accurate methods for their detection and quantification. In this paper, methods for ion chromatographic analysis of a variety of amines, alkanolamines, and associated anions, which may be used as corrosion inhibitors for steel reinforcement in concrete, are described. By careful adjustment of the conditions for analysis, these inhibitors were readily identified and quantified in concrete/cement pore solutions or digests. Characterisation of the cationic inhibitors, ethanolamine, quaternary methylammonium, dimethylethanolamine, cyclohexylamine, guanidine, and arginine, and the anionic inhibitors, nitrite, molybdate, acetate, benzoate, and azelate, was carried out conductimetrically. To enhance the sensitivity of detection, amperometry was used for the analysis of triethanolamine and low concentrations of ethanolamine. Ion chromatography was also used as a means of obtaining a distribution profile of the concentrations of inhibitor ions present throughout a concrete structure.

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Section: Methodsmentioning

confidence: 99%

Ion chromatographic analysis of amines, alkanolamines, and associated anions in concrete

Page

Shaw

et al. 2005

J of Separation Science

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“…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. However, Ngala et al (2002) posted a thought provoking question about nitrite base inhibitors in their research that: i) Can nitrite ions penetrate through concretes of different quality in adequate amounts to retard corrosion which has become established on embedded steel if recommended methods of surface application are used? ii) Is there a significant risk of intensified corrosion of embedded steel developing as a consequence of inadequate treatment of concrete which has been exposed to varying levels of carbonation and/or chloride contamination?…”

Section: Inorganic Inhibitorsmentioning

confidence: 99%

“…ii) Is there a significant risk of intensified corrosion of embedded steel developing as a consequence of inadequate treatment of concrete which has been exposed to varying levels of carbonation and/or chloride contamination? Ngala et al (2002) then concluded that on the basis of the performance recorded from relatively short-term laboratory investigations of the sort undertaken with a calcium nitrite-based treatment for corroding reinforced concrete, it appears that nitrite ions can be transported through realistic thicknesses of cover concrete of high water/cement ratio. Their effect was to cause some reduction in the corrosion rate of moderately precorroding steel in noncarbonated concrete with modest levels of chloride contamination and in carbonated concrete without chloride.…”

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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“…All of these have tended to focus attention on techniques for inhibiting corrosion in concrete. The use of corrosion inhibitors is most attractive from the viewpoint of ease of application and economy, among the widely available methods to prevent corrosion in concrete [3][4][5]. There are many studied done on the use of inhibitors of corrosion of steel [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on Effects of Sodium Citrate, Calcium Nitrite and Hexamine as Corrosion Inhibitor in Concrete

Quraishi¹

2017

J Steel Struct Constr

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In the present study the effect of sodium citrate, calcium nitrate, and hexamine on corrosion of steel was analyzed. The effect of inhibitor on normal consistency of cement, initial and final setting time of cement, compressive strength of cement, soundness of cement and compressive strength of concrete were also analyzed. The results of the study also concluded that hexamine and calcium nitrite are more efficient inhibitor. It showed 45% and 25% inhibitor efficiency at the denseness of 0.5% hexamine and 0.5% calcium nitrite by weight of cement respectively. Further, sodium citrate also prevents the hydration of cement, but it is not suitable as an inhibitor. The addition of Inhibitor acts as retarder for the initial and final setting period of the cement and retard the compressive strength at initial days. After 180 days strength is improved significantly.

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Corrosion inhibitor systems for remedial treatment of reinforced concrete. Part 1: calcium nitrite

Cited by 102 publications

References 8 publications

Ion chromatographic analysis of amines, alkanolamines, and associated anions in concrete

Ion chromatographic analysis of amines, alkanolamines, and associated anions in concrete

Corrosion inhibitors for steel reinforcement in concrete: A review

Experimental Studies on Effects of Sodium Citrate, Calcium Nitrite and Hexamine as Corrosion Inhibitor in Concrete

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