Porosity and electrical resistivity-based empirical calculation of the oxygen diffusion coefficient in concrete

Concrete carbonation induced by gas transport has an adverse effect on the service life of the steel-reinforced material. Gas tightness is crucial where concrete is used to contain radioactive materials and of utmost importance where acting as a radon barrier. Since as a rule gas travel inside concr...

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Autores: Linares-Alemparte, P., Andrade Perdrix, Carmen, Baza, D.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/210797
Acceso en línea:http://hdl.handle.net/10261/210797
Access Level:acceso abierto
Palabra clave:Concretes
Diffusion
Porosity
Oxygen
Resistivity
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spelling Porosity and electrical resistivity-based empirical calculation of the oxygen diffusion coefficient in concreteLinares-Alemparte, P.Andrade Perdrix, CarmenBaza, D.ConcretesDiffusionPorosityOxygenResistivityConcrete carbonation induced by gas transport has an adverse effect on the service life of the steel-reinforced material. Gas tightness is crucial where concrete is used to contain radioactive materials and of utmost importance where acting as a radon barrier. Since as a rule gas travel inside concrete is governed either by diffusion or permeability, the material’s performance in that respect is assessed by analysing those two parameters. The gas diffusion coefficient in concrete is not readily found, however, due to the practical difficulties involved in preventing gas from leaking out of standard diffusion cells. An alternative approach is to measure permeability at high gas concentration and pressure. The existence of a relationship between the oxygen diffusion coefficient and permeability in OPC concrete was established by the authors in a previous paper. Diffusion has also been shown to be related to porosity and, in solutions, to electrical resistivity. Little is known, however, about the relationship between gas diffusion and resistivity where the pores may be filled not with a liquid, but with air. Inasmuch as resistivity is a non-destructive technique and porosity a property that can be readily measured, these two parameters could be used to directly assess concrete durability, its performance in nuclear facilities and its suitability as a radon barrier. This paper describes a study conducted to formulate equations from which to analytically determine the oxygen diffusion coefficient. These equations are derived from empirical measurements of oxygen diffusion coefficient, concrete porosity and electrical resistivity. The findings, which corroborate the existence of such relationships, were used to formulate an equation to calculate the diffusion coefficient directly from the experimental values of concrete porosity and resistivity. Since porosity depends primarily on concrete batching, curing and moisture content, two OPC concrete mixes were prepared using different water/cement ratios and two curing conditions. The combination resulted in four types of concrete. Pre-conditioning at three values of relative humidity was subsequently deployed.This study was funded exclusively by the three authors’ employer, the Spanish National Research Council.Peer reviewedElsevierConsejo Superior de Investigaciones Científicas (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202020202019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/210797reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.conbuildmat.2018.11.269Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2107972026-05-22T06:33:51Z
dc.title.none.fl_str_mv Porosity and electrical resistivity-based empirical calculation of the oxygen diffusion coefficient in concrete
title Porosity and electrical resistivity-based empirical calculation of the oxygen diffusion coefficient in concrete
spellingShingle Porosity and electrical resistivity-based empirical calculation of the oxygen diffusion coefficient in concrete
Linares-Alemparte, P.
Concretes
Diffusion
Porosity
Oxygen
Resistivity
title_short Porosity and electrical resistivity-based empirical calculation of the oxygen diffusion coefficient in concrete
title_full Porosity and electrical resistivity-based empirical calculation of the oxygen diffusion coefficient in concrete
title_fullStr Porosity and electrical resistivity-based empirical calculation of the oxygen diffusion coefficient in concrete
title_full_unstemmed Porosity and electrical resistivity-based empirical calculation of the oxygen diffusion coefficient in concrete
title_sort Porosity and electrical resistivity-based empirical calculation of the oxygen diffusion coefficient in concrete
dc.creator.none.fl_str_mv Linares-Alemparte, P.
Andrade Perdrix, Carmen
Baza, D.
author Linares-Alemparte, P.
author_facet Linares-Alemparte, P.
Andrade Perdrix, Carmen
Baza, D.
author_role author
author2 Andrade Perdrix, Carmen
Baza, D.
author2_role author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Concretes
Diffusion
Porosity
Oxygen
Resistivity
topic Concretes
Diffusion
Porosity
Oxygen
Resistivity
description Concrete carbonation induced by gas transport has an adverse effect on the service life of the steel-reinforced material. Gas tightness is crucial where concrete is used to contain radioactive materials and of utmost importance where acting as a radon barrier. Since as a rule gas travel inside concrete is governed either by diffusion or permeability, the material’s performance in that respect is assessed by analysing those two parameters. The gas diffusion coefficient in concrete is not readily found, however, due to the practical difficulties involved in preventing gas from leaking out of standard diffusion cells. An alternative approach is to measure permeability at high gas concentration and pressure. The existence of a relationship between the oxygen diffusion coefficient and permeability in OPC concrete was established by the authors in a previous paper. Diffusion has also been shown to be related to porosity and, in solutions, to electrical resistivity. Little is known, however, about the relationship between gas diffusion and resistivity where the pores may be filled not with a liquid, but with air. Inasmuch as resistivity is a non-destructive technique and porosity a property that can be readily measured, these two parameters could be used to directly assess concrete durability, its performance in nuclear facilities and its suitability as a radon barrier. This paper describes a study conducted to formulate equations from which to analytically determine the oxygen diffusion coefficient. These equations are derived from empirical measurements of oxygen diffusion coefficient, concrete porosity and electrical resistivity. The findings, which corroborate the existence of such relationships, were used to formulate an equation to calculate the diffusion coefficient directly from the experimental values of concrete porosity and resistivity. Since porosity depends primarily on concrete batching, curing and moisture content, two OPC concrete mixes were prepared using different water/cement ratios and two curing conditions. The combination resulted in four types of concrete. Pre-conditioning at three values of relative humidity was subsequently deployed.
publishDate 2019
dc.date.none.fl_str_mv 2019
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/210797
url http://hdl.handle.net/10261/210797
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.conbuildmat.2018.11.269
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
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