DIMINISHING CHLORIDE INDUCED STEEL CORROSION IN CONCRETE BY ELECTROMIGRATION OF NANOPARTICLES AND ITS MODELING

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F18%3A00325914" target="_blank" >RIV/68407700:21110/18:00325914 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

DIMINISHING CHLORIDE INDUCED STEEL CORROSION IN CONCRETE BY ELECTROMIGRATION OF NANOPARTICLES AND ITS MODELING

Popis výsledku v původním jazyce

Chloride induced corrosion is one of the most significant factors affecting reinforced concrete structural life. The corrosion process is initiated after depassivation of the steel due to e.g. concrete cracking, carbonation and/or presence of chloride ions. The corrosion can be then diminished by a few non-destructive ways. Electrochemical extraction of chlorides leads to lowering chloride concentrations at concrete cover. The extraction is only effective if chlorides did not pass rebars in a significant way. One the other hand corrosion inhibitors or nanoparticles can be driven towards reinforcement using the same electromigration principles [2,3]. The paper deals with experimental studies of nanoparticle electroinjection into concrete and shows a numerical framework used for modeling of both chlorides and nanoparticle migration in concrete. It is shown that nanoparticle treated samples exhibit increased resistance to chloride diffusion. The model is formulated using the Fick’s law, Nernst-Planck equation and Gauss law of electrostatics. Finite element approximation and the Galerkin-Petrov approach is used for solving practical examples of reinforced concrete structure. Natural diffusion of ions, accelerated extraction and injection in reinforced concrete are shown.

Název v anglickém jazyce

DIMINISHING CHLORIDE INDUCED STEEL CORROSION IN CONCRETE BY ELECTROMIGRATION OF NANOPARTICLES AND ITS MODELING

Popis výsledku anglicky

Chloride induced corrosion is one of the most significant factors affecting reinforced concrete structural life. The corrosion process is initiated after depassivation of the steel due to e.g. concrete cracking, carbonation and/or presence of chloride ions. The corrosion can be then diminished by a few non-destructive ways. Electrochemical extraction of chlorides leads to lowering chloride concentrations at concrete cover. The extraction is only effective if chlorides did not pass rebars in a significant way. One the other hand corrosion inhibitors or nanoparticles can be driven towards reinforcement using the same electromigration principles [2,3]. The paper deals with experimental studies of nanoparticle electroinjection into concrete and shows a numerical framework used for modeling of both chlorides and nanoparticle migration in concrete. It is shown that nanoparticle treated samples exhibit increased resistance to chloride diffusion. The model is formulated using the Fick’s law, Nernst-Planck equation and Gauss law of electrostatics. Finite element approximation and the Galerkin-Petrov approach is used for solving practical examples of reinforced concrete structure. Natural diffusion of ions, accelerated extraction and injection in reinforced concrete are shown.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA16-11879S" target="_blank" >GA16-11879S: Obnova železobetonových konstrukcí pomocí simultánního odstranění chloridů a injektování nanočástic</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů