Analytical and Numerical Investigation of an Electrochemical Chloride Barrier for Reinforced Concrete Structures

During the development of a carbon-reinforced mortar interlayer for bridges, the idea of an electrochemical chloride barrier arose. An electrical field is generated between two carbon meshes, and the negatively charged chloride ions are held on the polarized upper carbon mesh to prevent chloride-ind...

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Autores principales:	Carla Driessen-Ohlenforst, Michael Raupach
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	preventive cathodic protection chloride ingress numerical simulations carbon-reinforced concrete Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/71115ea714a6494f8579718f87a94a5e
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spelling	oai:doaj.org-article:71115ea714a6494f8579718f87a94a5e2021-11-11T18:13:07ZAnalytical and Numerical Investigation of an Electrochemical Chloride Barrier for Reinforced Concrete Structures10.3390/ma142167281996-1944https://doaj.org/article/71115ea714a6494f8579718f87a94a5e2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6728https://doaj.org/toc/1996-1944During the development of a carbon-reinforced mortar interlayer for bridges, the idea of an electrochemical chloride barrier arose. An electrical field is generated between two carbon meshes, and the negatively charged chloride ions are held on the polarized upper carbon mesh to prevent chloride-induced corrosion in the reinforcement. Laboratory tests unexpectedly showed that higher voltages lead to an increase in chloride ions for certain depths of the reference probes. This paper discusses the implementation of analytical and numerical models that finally explain the effect only by the acting diffusion and migration with the help of a finite differences model and finite elements simulations. The effect of the local minimum is limited to positions above the depth of the first carbon layer of the test specimens. It is caused by the lines of the electrical field between the first and second carbon layer. According to the experimental and finite elements simulation results, higher voltages lead to lower chloride concentrations for all positions below the first carbon layer only after sufficient time duration. Therefore, the intended effect of an electrochemical chloride barrier can in general only be observed and confirmed after a certain time depending on position, conditions and parameters.Carla Driessen-OhlenforstMichael RaupachMDPI AGarticlepreventive cathodic protectionchloride ingressnumerical simulationscarbon-reinforced concreteTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6728, p 6728 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	preventive cathodic protection chloride ingress numerical simulations carbon-reinforced concrete Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	preventive cathodic protection chloride ingress numerical simulations carbon-reinforced concrete Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Carla Driessen-Ohlenforst Michael Raupach Analytical and Numerical Investigation of an Electrochemical Chloride Barrier for Reinforced Concrete Structures
description	During the development of a carbon-reinforced mortar interlayer for bridges, the idea of an electrochemical chloride barrier arose. An electrical field is generated between two carbon meshes, and the negatively charged chloride ions are held on the polarized upper carbon mesh to prevent chloride-induced corrosion in the reinforcement. Laboratory tests unexpectedly showed that higher voltages lead to an increase in chloride ions for certain depths of the reference probes. This paper discusses the implementation of analytical and numerical models that finally explain the effect only by the acting diffusion and migration with the help of a finite differences model and finite elements simulations. The effect of the local minimum is limited to positions above the depth of the first carbon layer of the test specimens. It is caused by the lines of the electrical field between the first and second carbon layer. According to the experimental and finite elements simulation results, higher voltages lead to lower chloride concentrations for all positions below the first carbon layer only after sufficient time duration. Therefore, the intended effect of an electrochemical chloride barrier can in general only be observed and confirmed after a certain time depending on position, conditions and parameters.
format	article
author	Carla Driessen-Ohlenforst Michael Raupach
author_facet	Carla Driessen-Ohlenforst Michael Raupach
author_sort	Carla Driessen-Ohlenforst
title	Analytical and Numerical Investigation of an Electrochemical Chloride Barrier for Reinforced Concrete Structures
title_short	Analytical and Numerical Investigation of an Electrochemical Chloride Barrier for Reinforced Concrete Structures
title_full	Analytical and Numerical Investigation of an Electrochemical Chloride Barrier for Reinforced Concrete Structures
title_fullStr	Analytical and Numerical Investigation of an Electrochemical Chloride Barrier for Reinforced Concrete Structures
title_full_unstemmed	Analytical and Numerical Investigation of an Electrochemical Chloride Barrier for Reinforced Concrete Structures
title_sort	analytical and numerical investigation of an electrochemical chloride barrier for reinforced concrete structures
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/71115ea714a6494f8579718f87a94a5e
work_keys_str_mv	AT carladriessenohlenforst analyticalandnumericalinvestigationofanelectrochemicalchloridebarrierforreinforcedconcretestructures AT michaelraupach analyticalandnumericalinvestigationofanelectrochemicalchloridebarrierforreinforcedconcretestructures
_version_	1718431891989725184

Analytical and Numerical Investigation of an Electrochemical Chloride Barrier for Reinforced Concrete Structures

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