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Ajouter le résultat dans votre panierInterest of the probabilistic approach for the equivalent durability concept / Patrick Rougeau in European journal of environmental and civil engineering, Vol. 16 N° 3-4 (Mars/Avril 2012)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 256-263
Titre : Interest of the probabilistic approach for the equivalent durability concept Type de document : texte imprimé Auteurs : Patrick Rougeau, Auteur ; Torrenti, Jean-Michel, Auteur ; François Cussigh, Auteur Année de publication : 2012 Article en page(s) : pp. 256-263 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Durability Equivalent performance Probabilistic approach Résumé : The construction sector is the largest industrial consumer of raw materials. Like all materials, concrete has an important role to play in sustainable development through its contribution to energy saving and durability of constructions. In this context, the performance-based approach to concrete durability appears to be one of the essential tools. It enables the use of new constituents and innovative concrete mixes, while improving the level of safety for the end user. The difficulty of the performance-related design method lies in choosing the threshold value. In the equivalent durability concept the main difficulty is to define the reference concrete. In this article we propose a methodology which can be used to take into account the variability of the concrete properties when a performance-based approach is applied. The proposed methodology allows the interest of using some statistical aspects to be discussed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667704 [article] Interest of the probabilistic approach for the equivalent durability concept [texte imprimé] / Patrick Rougeau, Auteur ; Torrenti, Jean-Michel, Auteur ; François Cussigh, Auteur . - 2012 . - pp. 256-263.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 256-263
Mots-clés : Durability Equivalent performance Probabilistic approach Résumé : The construction sector is the largest industrial consumer of raw materials. Like all materials, concrete has an important role to play in sustainable development through its contribution to energy saving and durability of constructions. In this context, the performance-based approach to concrete durability appears to be one of the essential tools. It enables the use of new constituents and innovative concrete mixes, while improving the level of safety for the end user. The difficulty of the performance-related design method lies in choosing the threshold value. In the equivalent durability concept the main difficulty is to define the reference concrete. In this article we propose a methodology which can be used to take into account the variability of the concrete properties when a performance-based approach is applied. The proposed methodology allows the interest of using some statistical aspects to be discussed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667704
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 264-272
Titre : Probabilistic approach for durable design of concrete cover : Application to carbonation Type de document : texte imprimé Auteurs : Jonathan Mai-Nhu, Auteur ; Alain Sellier, Auteur ; Frédéric Duprat, Auteur Année de publication : 2012 Article en page(s) : pp. 264-272 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Durability Concrete cover Probabilistic approach Carbonation Corrosion Résumé : Probabilistic approach is increasingly resorted to in the design of new civil engineering structures and structural analysis of existing constructions. In this article an elementary physical and chemical model able to assess the lifetime of concrete structures subjected to carbonation ingress in natural conditions from results of accelerated tests or results from compressive strength is proposed for a probabilistic utilisation. Calculations performed on several practical applications highlight the importance of the probabilistic approach in the assessment of the reinforced concrete and pre-stressed reinforced concrete lifetimes especially with respect to the Standard context and recommendations in Eurocode 2. Results also allow the homogeneity of Eurocode 2 regarding reliability levels to be discussed and the question of a safety target index to be addressed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667705 [article] Probabilistic approach for durable design of concrete cover : Application to carbonation [texte imprimé] / Jonathan Mai-Nhu, Auteur ; Alain Sellier, Auteur ; Frédéric Duprat, Auteur . - 2012 . - pp. 264-272.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 264-272
Mots-clés : Durability Concrete cover Probabilistic approach Carbonation Corrosion Résumé : Probabilistic approach is increasingly resorted to in the design of new civil engineering structures and structural analysis of existing constructions. In this article an elementary physical and chemical model able to assess the lifetime of concrete structures subjected to carbonation ingress in natural conditions from results of accelerated tests or results from compressive strength is proposed for a probabilistic utilisation. Calculations performed on several practical applications highlight the importance of the probabilistic approach in the assessment of the reinforced concrete and pre-stressed reinforced concrete lifetimes especially with respect to the Standard context and recommendations in Eurocode 2. Results also allow the homogeneity of Eurocode 2 regarding reliability levels to be discussed and the question of a safety target index to be addressed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667705
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 273-287
Titre : Application of the reliability theory to the assessment of carbonation-induced corrosion risk of rebars Type de document : texte imprimé Auteurs : Mickael Thiery, Auteur ; Christian Crémona, Auteur ; Véronique Baroghel-Bouny, Auteur Année de publication : 2012 Article en page(s) : pp. 273-287 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Carbonation Durability design Probabilistic approach Reliability index Updating Résumé : Deterministic approaches for the prediction of the carbonation penetration have limitations related to the high variability of the input data. This paper deals with two carbonation models which are developed in the framework of a probabilistic approach. The random input data are presented, i.e. materials, environment and engineering design properties. The evaluation of the time-dependent probability of carbonation-induced reinforcement corrosion is assessed by calculating the reliability index for three studied concretes. This probabilistic approach provides a framework for a sensitivity analysis which enables one to identify the most influencing model parameters which have to be determined carefully in order to improve the accuracy of the prediction and to determine the parameters whose variability should be reduced to enhance the durability. Furthermore, a probabilistic approach provides a tool to design the thickness of the concrete cover in order to avoid oversizing. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667987 [article] Application of the reliability theory to the assessment of carbonation-induced corrosion risk of rebars [texte imprimé] / Mickael Thiery, Auteur ; Christian Crémona, Auteur ; Véronique Baroghel-Bouny, Auteur . - 2012 . - pp. 273-287.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 273-287
Mots-clés : Carbonation Durability design Probabilistic approach Reliability index Updating Résumé : Deterministic approaches for the prediction of the carbonation penetration have limitations related to the high variability of the input data. This paper deals with two carbonation models which are developed in the framework of a probabilistic approach. The random input data are presented, i.e. materials, environment and engineering design properties. The evaluation of the time-dependent probability of carbonation-induced reinforcement corrosion is assessed by calculating the reliability index for three studied concretes. This probabilistic approach provides a framework for a sensitivity analysis which enables one to identify the most influencing model parameters which have to be determined carefully in order to improve the accuracy of the prediction and to determine the parameters whose variability should be reduced to enhance the durability. Furthermore, a probabilistic approach provides a tool to design the thickness of the concrete cover in order to avoid oversizing. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667987
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 288-297
Titre : Influence of in situ concrete variability on accelerated carbonation test Type de document : texte imprimé Auteurs : Ph. Turcry, Auteur ; Younsi, A., Auteur ; F. Jacquemot, Auteur Année de publication : 2012 Article en page(s) : pp. 288-297 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Carbonation Accelerated test Variability In situ concrete Résumé : Probabilistic approaches to design reinforced concrete structures require the knowledge of distribution laws governing the statistical variability of concrete properties used as models inputs. The present work focuses on the variability of carbonation resistance throughout the construction period and inside an existing structure. Accelerated carbonation tests were carried out in a laboratory on more than 120 samples taken from two real building sites. Samples drilled from a bridge crosshead were also investigated. In the case of production-variability, the statistical distribution of the carbonation depths was found to be correctly modelled by a normal statistical distribution, as usually done for compressive strengths. However, these two properties appeared to be little correlated. Inside the structure, the carbonation resistance was shown to be higher with the distance to the surface of the drilled samples. In addition to experimental results, the efficiency of the accelerated carbonation test protocol, especially the preconditioning prior to carbonation, is discussed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667707 [article] Influence of in situ concrete variability on accelerated carbonation test [texte imprimé] / Ph. Turcry, Auteur ; Younsi, A., Auteur ; F. Jacquemot, Auteur . - 2012 . - pp. 288-297.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 288-297
Mots-clés : Carbonation Accelerated test Variability In situ concrete Résumé : Probabilistic approaches to design reinforced concrete structures require the knowledge of distribution laws governing the statistical variability of concrete properties used as models inputs. The present work focuses on the variability of carbonation resistance throughout the construction period and inside an existing structure. Accelerated carbonation tests were carried out in a laboratory on more than 120 samples taken from two real building sites. Samples drilled from a bridge crosshead were also investigated. In the case of production-variability, the statistical distribution of the carbonation depths was found to be correctly modelled by a normal statistical distribution, as usually done for compressive strengths. However, these two properties appeared to be little correlated. Inside the structure, the carbonation resistance was shown to be higher with the distance to the surface of the drilled samples. In addition to experimental results, the efficiency of the accelerated carbonation test protocol, especially the preconditioning prior to carbonation, is discussed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667707
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 298-310
Titre : Study of electrical resistivity : Variability assessment on two concretes: protocol study in laboratory and assessment on site Type de document : texte imprimé Auteurs : J.F. Lataste, Auteur ; T. De Larrard, Auteur ; F. Benboudjema, Auteur Année de publication : 2012 Article en page(s) : pp. 298-310 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Electrical resistivity Concrete Variability Measurements Résumé : This article presents electrical resistivity measurement on concrete. The first part presents the study of a lighter protocol for measuring electrical resistivity, allowing investigations of a large number of specimens, without degradation of the quality of final results. The second part is based on measurements made on two concretes cast regularly during one year each, on two sites. Measurements done to assess the different variability sources distinguish variability linked to the measurement of those related to the material. The third part of the article compares the laboratory measurements to those made on site. Finally, all the results reflected the interests of the resistivity measurement because of low variability obtained, and consistency between results. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667708 [article] Study of electrical resistivity : Variability assessment on two concretes: protocol study in laboratory and assessment on site [texte imprimé] / J.F. Lataste, Auteur ; T. De Larrard, Auteur ; F. Benboudjema, Auteur . - 2012 . - pp. 298-310.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 298-310
Mots-clés : Electrical resistivity Concrete Variability Measurements Résumé : This article presents electrical resistivity measurement on concrete. The first part presents the study of a lighter protocol for measuring electrical resistivity, allowing investigations of a large number of specimens, without degradation of the quality of final results. The second part is based on measurements made on two concretes cast regularly during one year each, on two sites. Measurements done to assess the different variability sources distinguish variability linked to the measurement of those related to the material. The third part of the article compares the laboratory measurements to those made on site. Finally, all the results reflected the interests of the resistivity measurement because of low variability obtained, and consistency between results. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667708
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 311-321
Titre : Porosity of concrete : Influence of test conditions and material variability Type de document : texte imprimé Auteurs : Fan Zhang, Auteur ; Thomas Rougelot, Auteur ; Nicolas Burlion, Auteur Année de publication : 2012 Article en page(s) : pp. 311-321 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Variability Spatial variability Concrete Porosity Experimental biases Résumé : The prediction of the service lifetime of civil engineering structures needs an appropriate comprehension and quantification of the physical, chemical and mechanical processes associated with the durability of structural reinforced concrete. In particular, the porosity is an essential property involved in degradation of concretes. Also, the development of a probabilistic approach could enhance estimations of service lifetime. Experimental tests are therefore performed in the framework of project APPLET and aim at quantifying variabilities linked to concrete itself and its setting in a real structure. A spatial variability and the effect of the drying protocol for the measurement of porosity have been highlighted. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667709 [article] Porosity of concrete : Influence of test conditions and material variability [texte imprimé] / Fan Zhang, Auteur ; Thomas Rougelot, Auteur ; Nicolas Burlion, Auteur . - 2012 . - pp. 311-321.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 311-321
Mots-clés : Variability Spatial variability Concrete Porosity Experimental biases Résumé : The prediction of the service lifetime of civil engineering structures needs an appropriate comprehension and quantification of the physical, chemical and mechanical processes associated with the durability of structural reinforced concrete. In particular, the porosity is an essential property involved in degradation of concretes. Also, the development of a probabilistic approach could enhance estimations of service lifetime. Experimental tests are therefore performed in the framework of project APPLET and aim at quantifying variabilities linked to concrete itself and its setting in a real structure. A spatial variability and the effect of the drying protocol for the measurement of porosity have been highlighted. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667709
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 322-335
Titre : Modelling the influence of temperature on accelerated leaching in ammonium nitrate Type de document : texte imprimé Auteurs : Thomas de Larrard, Auteur ; Stéphane Poyet, Auteur ; Magalie Pierre, Auteur Année de publication : 2012 Article en page(s) : pp. 322-335 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Leaching Temperature Ammonium nitrate Thermoactivation Résumé : This study proposes two models for accelerated leaching in ammonium nitrate under variable temperature. The first approach assumes a thermoactivated linear relationship between degradation and the square root of time. The second approach introduces, within a phenomenological model, the thermoactivation of diffusion and hydrates solubility. These two approaches enable one to analyse accelerated leaching tests to identify the concrete variability in order to get rid of the influence of temperature. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.675175 [article] Modelling the influence of temperature on accelerated leaching in ammonium nitrate [texte imprimé] / Thomas de Larrard, Auteur ; Stéphane Poyet, Auteur ; Magalie Pierre, Auteur . - 2012 . - pp. 322-335.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 322-335
Mots-clés : Leaching Temperature Ammonium nitrate Thermoactivation Résumé : This study proposes two models for accelerated leaching in ammonium nitrate under variable temperature. The first approach assumes a thermoactivated linear relationship between degradation and the square root of time. The second approach introduces, within a phenomenological model, the thermoactivation of diffusion and hydrates solubility. These two approaches enable one to analyse accelerated leaching tests to identify the concrete variability in order to get rid of the influence of temperature. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.675175
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 336-351
Titre : Accelerated leaching of cementitious materials using ammonium nitrate (6M) : Influence of test conditions Type de document : texte imprimé Auteurs : Stéphane Poyet, Auteur ; Patrick Le Bescop, Auteur ; Magalie Pierre, Auteur Année de publication : 2012 Article en page(s) : pp. 336-351 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cementitious materials Accelerated degradation Ammonium nitrate Protocol influence Résumé : We have focused on the test conditions influence on accelerated degradation of cementitious materials using ammonium nitrate. PH-buffering and renewal of the leaching solution were studied. PH-buffering appeared not to be very important when the renewal pH remains under eight. Renewal appeared to be the most influential feature. Its absence leads to calcium accumulation in the leaching solution inducing aggressiveness fall. Degradation is then less marked in terms of depth, flux and mineralogy. The resulting porosity increase is also smaller. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667712 [article] Accelerated leaching of cementitious materials using ammonium nitrate (6M) : Influence of test conditions [texte imprimé] / Stéphane Poyet, Auteur ; Patrick Le Bescop, Auteur ; Magalie Pierre, Auteur . - 2012 . - pp. 336-351.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 336-351
Mots-clés : Cementitious materials Accelerated degradation Ammonium nitrate Protocol influence Résumé : We have focused on the test conditions influence on accelerated degradation of cementitious materials using ammonium nitrate. PH-buffering and renewal of the leaching solution were studied. PH-buffering appeared not to be very important when the renewal pH remains under eight. Renewal appeared to be the most influential feature. Its absence leads to calcium accumulation in the leaching solution inducing aggressiveness fall. Degradation is then less marked in terms of depth, flux and mineralogy. The resulting porosity increase is also smaller. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667712
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 352-361
Titre : Assessment of the variability of moisture transfer properties of High Performance Concrete from a multi-stage drying experiment Type de document : texte imprimé Auteurs : A. Trabelsi, Auteur ; A. Hamami, Auteur ; R. Belarbi, Auteur Année de publication : 2012 Article en page(s) : pp. 352-361 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Desorption isotherm Moisture diffusion coefficient Statistical variability Site condition Résumé : This article aims to assess the characterisation of the water vapour desorption process and its variability under site conditions. It presents a probabilistic approach allowing the assessment of the distribution laws for the water vapour desorption isotherms (WVDI) and the moisture diffusion coefficient. These two parameters were evaluated from multistage drying experiment. For each stage, the analysis of the equilibrium state allows the determination of WVDI whereas the analysis of the desiccation kinetic makes possible the evaluation of the moisture diffusion coefficient. In order to have a representative variability, the study was carried out on two different High Performance Concretes (HPC) during a large-scale construction: overall, more than 300 specimens were tested. Results indicate that Gaussian distribution can be used for modelling the statistical variability of desorption isotherm while log-normal distribution is more appropriate for describing the variability of moisture diffusion coefficient. Furthermore, whatever the concrete, the coefficient of variation on the water content at equilibrium remain very similar. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667713 [article] Assessment of the variability of moisture transfer properties of High Performance Concrete from a multi-stage drying experiment [texte imprimé] / A. Trabelsi, Auteur ; A. Hamami, Auteur ; R. Belarbi, Auteur . - 2012 . - pp. 352-361.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 352-361
Mots-clés : Desorption isotherm Moisture diffusion coefficient Statistical variability Site condition Résumé : This article aims to assess the characterisation of the water vapour desorption process and its variability under site conditions. It presents a probabilistic approach allowing the assessment of the distribution laws for the water vapour desorption isotherms (WVDI) and the moisture diffusion coefficient. These two parameters were evaluated from multistage drying experiment. For each stage, the analysis of the equilibrium state allows the determination of WVDI whereas the analysis of the desiccation kinetic makes possible the evaluation of the moisture diffusion coefficient. In order to have a representative variability, the study was carried out on two different High Performance Concretes (HPC) during a large-scale construction: overall, more than 300 specimens were tested. Results indicate that Gaussian distribution can be used for modelling the statistical variability of desorption isotherm while log-normal distribution is more appropriate for describing the variability of moisture diffusion coefficient. Furthermore, whatever the concrete, the coefficient of variation on the water content at equilibrium remain very similar. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667713
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 362-374
Titre : Simplified models for the engineering of concrete formulations in a marine environment through a probabilistic method Type de document : texte imprimé Auteurs : Fabrice Deby, Auteur ; Myriam Carcasses, Auteur ; Alain Sellier, Auteur Année de publication : 2012 Article en page(s) : pp. 362-374 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete Corrosion Chloride diffusion Performance-based approach Reliability Bayesian network Résumé : This article aims to expose a probabilistic methodology for the design of concrete formulations in a marine environment. As defined in the performance-based approach, durability indicators, considered as random variables, will be defined by quantifying their variability. Based on elementary models for engineers, a classical probabilistic approach is then proposed: the probability to depassivate the reinforced bars, through a reliability index, is estimated in order to insure the durability of concrete. Moreover, a Bayesian network is used to update the distributions of random variables. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667716 [article] Simplified models for the engineering of concrete formulations in a marine environment through a probabilistic method [texte imprimé] / Fabrice Deby, Auteur ; Myriam Carcasses, Auteur ; Alain Sellier, Auteur . - 2012 . - pp. 362-374.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 362-374
Mots-clés : Concrete Corrosion Chloride diffusion Performance-based approach Reliability Bayesian network Résumé : This article aims to expose a probabilistic methodology for the design of concrete formulations in a marine environment. As defined in the performance-based approach, durability indicators, considered as random variables, will be defined by quantifying their variability. Based on elementary models for engineers, a classical probabilistic approach is then proposed: the probability to depassivate the reinforced bars, through a reliability index, is estimated in order to insure the durability of concrete. Moreover, a Bayesian network is used to update the distributions of random variables. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667716
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 375-391
Titre : Modelling the effects of steel corrosion in concrete, induced by carbon dioxide penetration Type de document : texte imprimé Auteurs : Alain Millard, Auteur ; Valérie L'Hostis, Auteur Année de publication : 2012 Article en page(s) : pp. 375-391 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Reinforced concrete Steel Corrosion Damage Coupled processes Hydric behaviour Oxygen Cracks Résumé : The aim of this article is to present the modelling approach developed in order to predict the effects of corrosion of the reinforcements induced by carbon dioxide penetration. The final objective of the project is to propose a phenomenological and coupled model taking into account all the processes involved in the degradation of reinforced concrete. In this context, the CORDOBA model considers the coupling between different processes involved in the cracking induced corrosion phenomenon. More precisely, hydric behaviour of concrete is coupled with oxygen transport and corrosion reaction, as well as with mechanical damage of concrete. The effect of a pre-existing crack on the development of corrosion is also analysed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667976 [article] Modelling the effects of steel corrosion in concrete, induced by carbon dioxide penetration [texte imprimé] / Alain Millard, Auteur ; Valérie L'Hostis, Auteur . - 2012 . - pp. 375-391.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 375-391
Mots-clés : Reinforced concrete Steel Corrosion Damage Coupled processes Hydric behaviour Oxygen Cracks Résumé : The aim of this article is to present the modelling approach developed in order to predict the effects of corrosion of the reinforcements induced by carbon dioxide penetration. The final objective of the project is to propose a phenomenological and coupled model taking into account all the processes involved in the degradation of reinforced concrete. In this context, the CORDOBA model considers the coupling between different processes involved in the cracking induced corrosion phenomenon. More precisely, hydric behaviour of concrete is coupled with oxygen transport and corrosion reaction, as well as with mechanical damage of concrete. The effect of a pre-existing crack on the development of corrosion is also analysed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667976
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 392-401
Titre : Study of the impact of localised cracks on the corrosion mechanism Type de document : texte imprimé Auteurs : Raoul François, Auteur ; Inamullah Khan, Auteur ; Ngoc Anh Vu, Auteur Année de publication : 2012 Article en page(s) : pp. 392-401 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Corrosion Steel bars Cracks Chloride Résumé : Corrosion is one of the major problems that the reinforced concrete industry is facing nowadays. Much research has been carried out to investigate the influence of cracks on rebar corrosion. In this project ring shaped mortar samples with an 8mm steel bar inside were cracked with different crack widths and then subjected to continuous wetting and drying cycles in salt solution having 35 g/L of NaCl, to accelerate the corrosion process in laboratory conditions. The samples were broken after 1.5 years and 2.5 years to observe the corrosion pattern. Results show that cracks whatever their width allow the corrosion onset at the bottom of cracks and along the steel–concrete interface damaged zone caused by the creation of cracks. This process leads to corrosion cracks formation time dependant of the crack opening, which modify the environmental conditions at the level of steel leading to the generalisation of corrosion all along the re-bars. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667982 [article] Study of the impact of localised cracks on the corrosion mechanism [texte imprimé] / Raoul François, Auteur ; Inamullah Khan, Auteur ; Ngoc Anh Vu, Auteur . - 2012 . - pp. 392-401.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 392-401
Mots-clés : Corrosion Steel bars Cracks Chloride Résumé : Corrosion is one of the major problems that the reinforced concrete industry is facing nowadays. Much research has been carried out to investigate the influence of cracks on rebar corrosion. In this project ring shaped mortar samples with an 8mm steel bar inside were cracked with different crack widths and then subjected to continuous wetting and drying cycles in salt solution having 35 g/L of NaCl, to accelerate the corrosion process in laboratory conditions. The samples were broken after 1.5 years and 2.5 years to observe the corrosion pattern. Results show that cracks whatever their width allow the corrosion onset at the bottom of cracks and along the steel–concrete interface damaged zone caused by the creation of cracks. This process leads to corrosion cracks formation time dependant of the crack opening, which modify the environmental conditions at the level of steel leading to the generalisation of corrosion all along the re-bars. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667982
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 402-413
Titre : Concrete cracking due to chloride-induced reinforcement corrosion : Influence of steel–concrete interface defects due to the ‘top-bar effect’ Type de document : texte imprimé Auteurs : R. Zhang, Auteur ; A. Castel, Auteur ; R. François, Auteur Année de publication : 2012 Article en page(s) : pp. 402-413 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Reinforced concrete Chloride corrosion Steel–concrete interface Cracking Résumé : This article deals with the influence of the steel–concrete interface condition on reinforcement corrosion and concrete cracking in a chloride environment. Four large concrete members were cast with horizontal reinforcements at different levels in order to create voids under the upper horizontal bars due to the well-known ‘top-bar effect.’ Then, the members were sawn into smaller specimens that included one rebar. Specimens obtained were submitted to wetting–drying cycles in salt water (natural corrosion process) until concrete cracking was observed. Results show that before concrete cracking, the corrosion pattern observed is completely different between the specimens with defect (generalised corrosion) or without defect (local pitting corrosion). The concrete cracking is delayed for specimens affected by the ‘top-bar effect’ in spite of a higher corrosion rate, and occurs at a significantly higher corrosion rate. A new model for uniform steel cross-section reduction calculation from concrete crack width in case of ‘Top-bar effect’ is proposed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667984 [article] Concrete cracking due to chloride-induced reinforcement corrosion : Influence of steel–concrete interface defects due to the ‘top-bar effect’ [texte imprimé] / R. Zhang, Auteur ; A. Castel, Auteur ; R. François, Auteur . - 2012 . - pp. 402-413.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 402-413
Mots-clés : Reinforced concrete Chloride corrosion Steel–concrete interface Cracking Résumé : This article deals with the influence of the steel–concrete interface condition on reinforcement corrosion and concrete cracking in a chloride environment. Four large concrete members were cast with horizontal reinforcements at different levels in order to create voids under the upper horizontal bars due to the well-known ‘top-bar effect.’ Then, the members were sawn into smaller specimens that included one rebar. Specimens obtained were submitted to wetting–drying cycles in salt water (natural corrosion process) until concrete cracking was observed. Results show that before concrete cracking, the corrosion pattern observed is completely different between the specimens with defect (generalised corrosion) or without defect (local pitting corrosion). The concrete cracking is delayed for specimens affected by the ‘top-bar effect’ in spite of a higher corrosion rate, and occurs at a significantly higher corrosion rate. A new model for uniform steel cross-section reduction calculation from concrete crack width in case of ‘Top-bar effect’ is proposed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667984
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 414-439
Titre : A simplified numerical approach of global behaviour of RC beams degraded by corrosion Type de document : texte imprimé Auteurs : Lucas Adelaide, Auteur ; Benjamin Richard, Auteur ; Frédéric Ragueneau, Auteur Année de publication : 2012 Article en page(s) : pp. 414-439 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Steel/concrete interface Modelling Multifiber Corrosion Reinforced concrete Résumé : One of major causes responsible for the performance loss of reinforced concrete structures is the corrosion phenomenon. Thereby, taking into account the local effects of the steel/concrete interface is of primary importance to predict properly the response of corroded reinforced concrete structures. A multifiber-based model including the steel/concrete interface is proposed. This interface model allows taking into consideration the bond strength variation due to corrosion. Such an approach leads to reasonable computational costs which a powerful feature of the model. A numerical study of beams already studied in the French project « benchmark des poutres de la Rance » is proposed in order to show the efficiency and reliability of the proposed model. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667990 [article] A simplified numerical approach of global behaviour of RC beams degraded by corrosion [texte imprimé] / Lucas Adelaide, Auteur ; Benjamin Richard, Auteur ; Frédéric Ragueneau, Auteur . - 2012 . - pp. 414-439.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 414-439
Mots-clés : Steel/concrete interface Modelling Multifiber Corrosion Reinforced concrete Résumé : One of major causes responsible for the performance loss of reinforced concrete structures is the corrosion phenomenon. Thereby, taking into account the local effects of the steel/concrete interface is of primary importance to predict properly the response of corroded reinforced concrete structures. A multifiber-based model including the steel/concrete interface is proposed. This interface model allows taking into consideration the bond strength variation due to corrosion. Such an approach leads to reasonable computational costs which a powerful feature of the model. A numerical study of beams already studied in the French project « benchmark des poutres de la Rance » is proposed in order to show the efficiency and reliability of the proposed model. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667990
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 440-449
Titre : Structural performance of a 26-year-old corroded reinforced concrete beam Type de document : texte imprimé Auteurs : Inamullah Khan, Auteur ; Raoul François, Auteur ; Arnaud Castel, Auteur Année de publication : 2012 Article en page(s) : pp. 440-449 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Corrosion Reinforced concrete Load-bearing capacity Stiffness Ductility Chloride Résumé : This article presents experimental results and the modelling of a highly corroded beam subjected to a chloride environment to assess the performance of long-term-corrosion-damaged beams. A reinforced concrete beam corroded by 26 years of exposure to a chloride environment was tested until failure, as was a control beam of the same age. Cracking maps and corrosion maps were drawn for the corroded beam. Force displacement curves for both beams and stress strain curves for the steel bars were also plotted. From the results it appears that corrosion has a significant impact on the load carrying capacity, stiffness and deflection of beams. The modelling approach using Macro Finite Element (MFE) shows good agreement with experimental results in terms of load capacity, stiffness of the beam and ultimate deflection. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667992 [article] Structural performance of a 26-year-old corroded reinforced concrete beam [texte imprimé] / Inamullah Khan, Auteur ; Raoul François, Auteur ; Arnaud Castel, Auteur . - 2012 . - pp. 440-449.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 440-449
Mots-clés : Corrosion Reinforced concrete Load-bearing capacity Stiffness Ductility Chloride Résumé : This article presents experimental results and the modelling of a highly corroded beam subjected to a chloride environment to assess the performance of long-term-corrosion-damaged beams. A reinforced concrete beam corroded by 26 years of exposure to a chloride environment was tested until failure, as was a control beam of the same age. Cracking maps and corrosion maps were drawn for the corroded beam. Force displacement curves for both beams and stress strain curves for the steel bars were also plotted. From the results it appears that corrosion has a significant impact on the load carrying capacity, stiffness and deflection of beams. The modelling approach using Macro Finite Element (MFE) shows good agreement with experimental results in terms of load capacity, stiffness of the beam and ultimate deflection. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667992
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 450-459
Titre : Influence of accelerated corrosion on the reinforced cover concrete cracking behavior : Experimental and numerical study Type de document : texte imprimé Auteurs : Benjamin Richard, Auteur ; Marc Quiertant, Auteur ; Véronique Bouteiller, Auteur Année de publication : 2012 Article en page(s) : pp. 450-459 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Reinforced concrete Corrosion Corrosion modeling Electrochemical tests Résumé : This article aims to present both experimental and numerical studies of the corrosion induced cracking pattern evolution of a reinforced concrete sample subjected to accelerated corrosion. The beam was not mechanically loaded. Rebars were intentiostatically corroded using a current density of 100μA/cm² of steel, in a chloride pond and for a 30 day period. Electrochemical tests and visual inspections were carried out in order to characterise the rebar state. Width evolution of the main longitudinal cover crack was measured thanks to ball-extensometer. A numerical modeling of the corroded RC beam has also been realised. The experimental and numerical results are in good agreement confirming the efficiency of the proposed modelling. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667997 [article] Influence of accelerated corrosion on the reinforced cover concrete cracking behavior : Experimental and numerical study [texte imprimé] / Benjamin Richard, Auteur ; Marc Quiertant, Auteur ; Véronique Bouteiller, Auteur . - 2012 . - pp. 450-459.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 450-459
Mots-clés : Reinforced concrete Corrosion Corrosion modeling Electrochemical tests Résumé : This article aims to present both experimental and numerical studies of the corrosion induced cracking pattern evolution of a reinforced concrete sample subjected to accelerated corrosion. The beam was not mechanically loaded. Rebars were intentiostatically corroded using a current density of 100μA/cm² of steel, in a chloride pond and for a 30 day period. Electrochemical tests and visual inspections were carried out in order to characterise the rebar state. Width evolution of the main longitudinal cover crack was measured thanks to ball-extensometer. A numerical modeling of the corroded RC beam has also been realised. The experimental and numerical results are in good agreement confirming the efficiency of the proposed modelling. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667997
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 460-470
Titre : A Bayesian approach to estimate material properties from global statistical data Type de document : texte imprimé Auteurs : Benjamin Richard, Auteur ; Lucas Adelaide, Auteur ; Christian Cremonab, Auteur Année de publication : 2012 Article en page(s) : pp. 460-470 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Bayesian networks Updating Damage mechanics Finite elements Modelling Résumé : This paper is devoted to presenting an updated approach based on the use of Bayesian networks. This methodology aims to update the statistical parameters related to a mechanical model thanks to experimental data. The proposed updating process has been applied to engineering problems. The results show that the proposed approach could be used to estimate the material parameters of a given structure and avoids carrying out destructive tests on site. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667999 [article] A Bayesian approach to estimate material properties from global statistical data [texte imprimé] / Benjamin Richard, Auteur ; Lucas Adelaide, Auteur ; Christian Cremonab, Auteur . - 2012 . - pp. 460-470.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 460-470
Mots-clés : Bayesian networks Updating Damage mechanics Finite elements Modelling Résumé : This paper is devoted to presenting an updated approach based on the use of Bayesian networks. This methodology aims to update the statistical parameters related to a mechanical model thanks to experimental data. The proposed updating process has been applied to engineering problems. The results show that the proposed approach could be used to estimate the material parameters of a given structure and avoids carrying out destructive tests on site. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667999
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 471-480
Titre : Influence of humidity and temperature on the corrosion of reinforced concrete prisms Type de document : texte imprimé Auteurs : Véronique Bouteiller, Auteur ; Jean-François Cherrier, Auteur ; Valérie L'Hostis, Auteur Année de publication : 2012 Article en page(s) : pp. 471-480 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Reinforced concrete corrosion Electrochemical measurements Chlorides Carbonation Temperature Humidity Résumé : Reinforcement corrosion is one of the major durability problems that need to be solved in order to extend the service life of a structure. It is influenced, on one hand, by the concrete itself, sound or polluted (chlorinated or carbonated), and on the other hand, by the environmental conditions (controlled or outdoor). To explore the influence of temperature and humidity, electrochemical characterisations (potential, linear polarisation resistance and corrosion rate) were carried out on reinforced concrete prisms. A database of more than 3000 values has been delivered. The results enabled us to deduce that both parameters have influences on each other. Moreover, considering the four concretes, the corrosion order obtained in controlled conditions may be different from the one obtained in outdoor conditions. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668004 [article] Influence of humidity and temperature on the corrosion of reinforced concrete prisms [texte imprimé] / Véronique Bouteiller, Auteur ; Jean-François Cherrier, Auteur ; Valérie L'Hostis, Auteur . - 2012 . - pp. 471-480.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 471-480
Mots-clés : Reinforced concrete corrosion Electrochemical measurements Chlorides Carbonation Temperature Humidity Résumé : Reinforcement corrosion is one of the major durability problems that need to be solved in order to extend the service life of a structure. It is influenced, on one hand, by the concrete itself, sound or polluted (chlorinated or carbonated), and on the other hand, by the environmental conditions (controlled or outdoor). To explore the influence of temperature and humidity, electrochemical characterisations (potential, linear polarisation resistance and corrosion rate) were carried out on reinforced concrete prisms. A database of more than 3000 values has been delivered. The results enabled us to deduce that both parameters have influences on each other. Moreover, considering the four concretes, the corrosion order obtained in controlled conditions may be different from the one obtained in outdoor conditions. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668004
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 481-490
Titre : Study of the active/passive corrosion behaviour of reinforced concrete slabs using different devices Type de document : texte imprimé Auteurs : V. L'Hostis, Auteur ; E. Marie-Victoire, Auteur ; V. Bouteiller, Auteur Année de publication : 2012 Article en page(s) : pp. 481-490 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Reinforced concrete corrosion Electrochemical measurements Chlorides Carbonation Résumé : This paper deals with results of electrochemical measurements carried out on reinforced concrete slabs. Measurements were performed four times a year over a period of two years by means of three kinds of device: a Gamry© laboratory potentiostat, and Gecor6© and Galvapulse© on-site apparatuses. Results showed that all devices are able to detect passive corrosion. They coherently diagnose chloride-containing-slabs and can detect the depassivation of rebars. The variability of the depassivation time was pointed out as far as chloride-induced-corrosion is concerned. Conversely, corrosion levels proposed by the three devices are different in the case of carbonation (generalised)-induced corrosion, even if all of them detect the active corrosion state. This discrepancy showed that the use of these results in term of steel loss is not possible. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668010 [article] Study of the active/passive corrosion behaviour of reinforced concrete slabs using different devices [texte imprimé] / V. L'Hostis, Auteur ; E. Marie-Victoire, Auteur ; V. Bouteiller, Auteur . - 2012 . - pp. 481-490.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 481-490
Mots-clés : Reinforced concrete corrosion Electrochemical measurements Chlorides Carbonation Résumé : This paper deals with results of electrochemical measurements carried out on reinforced concrete slabs. Measurements were performed four times a year over a period of two years by means of three kinds of device: a Gamry© laboratory potentiostat, and Gecor6© and Galvapulse© on-site apparatuses. Results showed that all devices are able to detect passive corrosion. They coherently diagnose chloride-containing-slabs and can detect the depassivation of rebars. The variability of the depassivation time was pointed out as far as chloride-induced-corrosion is concerned. Conversely, corrosion levels proposed by the three devices are different in the case of carbonation (generalised)-induced corrosion, even if all of them detect the active corrosion state. This discrepancy showed that the use of these results in term of steel loss is not possible. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668010
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 491-504
Titre : Numerical study of the linear polarisation resistance technique applied to reinforced concrete for corrosion assessment Type de document : texte imprimé Auteurs : A. Clément, Auteur ; S. Laurens, Auteur ; G. Arliguie, Auteur Année de publication : 2012 Article en page(s) : pp. 491-504 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Corrosion Steel reinforced concrete Linear polarisation resistance On-site measurement Numerical simulation Résumé : The linear polarisation resistance (LPR) technique is increasingly being implemented to assess the corrosion rate of steel reinforcements in concrete. However, a lack of reliability is often observed experimentally. In order to improve the physical comprehension of the LPR technique, FEM simulations were performed. Several measurement devices using annular and rectangular probe geometries were simulated and the numerical experimentation allowed the relevance of RILEM recommendations for on-site measurements to be tested. It was shown that the LPR measurement using annular counter-electrodes with confining devices was a real three-dimensional physical problem and the non-uniform distribution of the polarising current on the steel surface is actually a major source of error since it is not taken into account by the usual protocols. Moreover, it was found that some complexity was induced by the use of guard-rings. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668012 [article] Numerical study of the linear polarisation resistance technique applied to reinforced concrete for corrosion assessment [texte imprimé] / A. Clément, Auteur ; S. Laurens, Auteur ; G. Arliguie, Auteur . - 2012 . - pp. 491-504.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 491-504
Mots-clés : Corrosion Steel reinforced concrete Linear polarisation resistance On-site measurement Numerical simulation Résumé : The linear polarisation resistance (LPR) technique is increasingly being implemented to assess the corrosion rate of steel reinforcements in concrete. However, a lack of reliability is often observed experimentally. In order to improve the physical comprehension of the LPR technique, FEM simulations were performed. Several measurement devices using annular and rectangular probe geometries were simulated and the numerical experimentation allowed the relevance of RILEM recommendations for on-site measurements to be tested. It was shown that the LPR measurement using annular counter-electrodes with confining devices was a real three-dimensional physical problem and the non-uniform distribution of the polarising current on the steel surface is actually a major source of error since it is not taken into account by the usual protocols. Moreover, it was found that some complexity was induced by the use of guard-rings. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668012
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 505-523
Titre : On-site instantaneous corrosion rate measurements on a historical building Type de document : texte imprimé Auteurs : E. Marie-Victoire, Auteur ; V. Bouteiller, Auteur ; J-L. Garciaz, Auteur Année de publication : 2012 Article en page(s) : pp. 505-523 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Reinforced concrete Corrosion Potential mapping Resistivity mapping Linear polarisation resistance On site Natural ageing Résumé : Rebar corrosion is major decay encountered in the field of historical monuments made of reinforced concrete. In order to preserve a maximum of this cultural heritage, reliable on-site diagnosis tools are crucial. The purpose of the present study was to evaluate, on a naturally aged concrete, the impact on one hand of the environmental conditions and on the other hand of the device employed, on the electrochemical techniques commonly used on site. Three sets of electrochemical measurements (half-cell potential, resistivity and polarisation resistance) were carried out on Notre-Dame de Royan Church, affected by both carbonation and slight chloride pollution. The results have indicated that the seasonal impact was low compared to that of a raining event, but also that depending on the device used, significant differences were observed in the polarisation resistance values measured. However, a reliable qualitative diagnosis was systematically possible. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668013 [article] On-site instantaneous corrosion rate measurements on a historical building [texte imprimé] / E. Marie-Victoire, Auteur ; V. Bouteiller, Auteur ; J-L. Garciaz, Auteur . - 2012 . - pp. 505-523.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 505-523
Mots-clés : Reinforced concrete Corrosion Potential mapping Resistivity mapping Linear polarisation resistance On site Natural ageing Résumé : Rebar corrosion is major decay encountered in the field of historical monuments made of reinforced concrete. In order to preserve a maximum of this cultural heritage, reliable on-site diagnosis tools are crucial. The purpose of the present study was to evaluate, on a naturally aged concrete, the impact on one hand of the environmental conditions and on the other hand of the device employed, on the electrochemical techniques commonly used on site. Three sets of electrochemical measurements (half-cell potential, resistivity and polarisation resistance) were carried out on Notre-Dame de Royan Church, affected by both carbonation and slight chloride pollution. The results have indicated that the seasonal impact was low compared to that of a raining event, but also that depending on the device used, significant differences were observed in the polarisation resistance values measured. However, a reliable qualitative diagnosis was systematically possible. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668013
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