Electrochemical injection of cathionic corrosion inhibitors

Němeček, Jiří; Kouřil, Milan; Šulc, Rostislav; Msallamová, Šárka; Lovaši, Tomáš

doi:10.15224/978-1-63248-139-9-27

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…From the current flow in samples protected by dispersion of colloidal silica, it is obvious that the conductivity of the colloidal solution is lower, but also that the colloidal silicon particles in the solution have a truly negative charge. The reasons for the current flow decrease are in the pore sealing and an increasing sample electrical resistance [7]. The most important finding from this measurement is that the electrical current flowing through the sample after nanosilica treatment was reduced by approx.…”

Section: Resultsmentioning

confidence: 83%

Chloride Resistance of Nanoparticle Repaired Concrete Measured by Accelerated Tests

Šulc

Himmel

Němeček

2018

KEM

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This paper describes results of experimental investigation of chloride ion penetration in concrete. Chloride concentration have been studied in accelerated conditions. Part of concrete samples were treated with colloidal nanosilica solution to increase their resistance to further chloride penetration. Measurement of chloride profiles was performed and compared on samples subjected to accelerated electrical migration tests lasting for a few days. The chloride ion profile in samples was determined in layers of 5 mm thickness up to a total profile thickness of 45 mm. The developed chloride concentrations reached values found after several years of exposure in natural conditions. It was found that the resistance to chloride penetration is substantially improved by nanosilica injection and the resistance to chloride penetration is increased by 60%.

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Section: Resultsmentioning

confidence: 83%

Chloride Resistance of Nanoparticle Repaired Concrete Measured by Accelerated Tests

Šulc

Himmel

Němeček

2018

KEM

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“…Detection of NPs is, however, more complicated since neither ion selective electrodes nor UV-spectroscopy measurements are applicable. The NP profile can either be assessed from sample slice weighing or from quantitative EDS in an electron microscope [23]. Determination of these parameters is, however, beyond the scope of the current paper.…”

Section: Special Concrete and Composites 2017mentioning

confidence: 99%

Nanoparticles in Concrete: Application in Fresh and Hardened State

Němeček

Šulc

Němečková

et al. 2018

KEM

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The paper summarizes utilization of nanoparticles (NP) in concrete for enhancing its mechanical, transport or other properties. The first part is devoted to review of NPs used in fresh concrete mixtures that have been reported previously in the literature while the second part shows original results from utilization of nanoparticles as healing agents for reparing of existing concrete structures. In the second case, nanoparticles are delivered to concrete via electrokinetic principle by using their surface charge provided in colloidal solutions. Particles are transported in the pore liquid of concrete due to electric field applied between the concrete surface and steel reinforcement. In this way, distressed concrete can be repaired, cracks sealed and risk of corrosion diminished. The injection of NPs can be complemented with extraction of chlorides that are the main deteriorating chemicals in reinforced concrete structures. Finally, the paper shows a framework developed for the electrokinetic transport of ionic species in concrete applied to chloride extraction from concrete and how it can be modified also for transport of nanoparticles.

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Electrochemical Healing Techniques for Concrete Reinforcement Restoration

Lovaši¹,

Msallamová²,

Kouřil³

2019

AJS

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Electrochemical chloride extraction (ECE) from a reinforced concrete structure may be accompanied with an electrochemical injection of healing agents (EICI) if such agents are positively charged and are able to migrate towards the activated reinforcement. Positive charge carrying nanoparticles or cationic corrosion inhibitors might be the proper choice. Organic substances with a positive charge and their salts are mostly such inhibitors. In this study, critical concentration of chlorides was investigated for fresh and carbonated concrete pore solution. Corrosion inhibition efficiency was evaluated by means of polarization resistance as a measure of corrosion rate. Sodium nitrite was taken as a reference corrosion inhibitor. As a second objective were migration tests. ECE and EICI were performed in order to test the migration ability of promising cation corrosion inhibitors, namely tetrabutylammonium bromide and tetrabutylphosphonium bromide. Concentration profile of the inhibitors and chlorides was investigated in the testing concrete blocks. The best results have been obtained for tetrabutylammonium bromide.

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Electrochemical injection of cathionic corrosion inhibitors

Cited by 3 publications

References 17 publications

Chloride Resistance of Nanoparticle Repaired Concrete Measured by Accelerated Tests

Chloride Resistance of Nanoparticle Repaired Concrete Measured by Accelerated Tests

Nanoparticles in Concrete: Application in Fresh and Hardened State

Electrochemical Healing Techniques for Concrete Reinforcement Restoration

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