Documents disponibles écrits par cet auteur

Chemo–mechanical modeling for prediction of alkali silica reaction (ASR) expansion / Stéphane Multon in Cement and concrete research, Vol. 39 N° 6 (Juin 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 6 (Juin 2009) . - pp. Martin Cyr Titre : Chemo–mechanical modeling for prediction of alkali silica reaction (ASR) expansion Type de document : texte imprimé Auteurs : Stéphane Multon, Auteur ; Alain Sellier, Auteur ; Martin Cyr, Auteur Année de publication : 2009 Article en page(s) : pp. Martin Cyr Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Alkali-silica  reaction  (ASR);  Particle  size;  Alkali  content;  Expansion;  Model Résumé : The effect of the size of the aggregate on ASR expansion has already been well illustrated. This paper presents a microscopic model to analyze the development of ASR expansion of mortars containing reactive aggregate of different sizes. The attack of the reactive silica by alkali was determined through the mass balance equation, which controls the diffusion mechanism in the aggregate and the fixation of the alkali in the ASR gels. The mechanical part of the model is based on the damage theory in order to assess the decrease of stiffness of the mortar due to cracking caused by ASR and to calculate the expansion of a Representative Elementary Volume (REV) of concrete. Parameters of the model were estimated by curve fitting the expansions of four experimental mortars. The paper shows that the decrease of expansion with the size of the aggregate and the increase of the expansion with the alkali content are reproduced by the model, which is able to predict the expansions of six other mortars containing two sizes of reactive aggregate and cast with two alkali contents. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000702 [article] Chemo–mechanical modeling for prediction of alkali silica reaction (ASR) expansion [texte imprimé] / Stéphane Multon, Auteur ; Alain Sellier, Auteur ; Martin Cyr, Auteur . - 2009 . - pp. Martin Cyr. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 6 (Juin 2009) . - pp. Martin Cyr Mots-clés : Alkali-silica  reaction  (ASR);  Particle  size;  Alkali  content;  Expansion;  Model Résumé : The effect of the size of the aggregate on ASR expansion has already been well illustrated. This paper presents a microscopic model to analyze the development of ASR expansion of mortars containing reactive aggregate of different sizes. The attack of the reactive silica by alkali was determined through the mass balance equation, which controls the diffusion mechanism in the aggregate and the fixation of the alkali in the ASR gels. The mechanical part of the model is based on the damage theory in order to assess the decrease of stiffness of the mortar due to cracking caused by ASR and to calculate the expansion of a Representative Elementary Volume (REV) of concrete. Parameters of the model were estimated by curve fitting the expansions of four experimental mortars. The paper shows that the decrease of expansion with the size of the aggregate and the increase of the expansion with the alkali content are reproduced by the model, which is able to predict the expansions of six other mortars containing two sizes of reactive aggregate and cast with two alkali contents. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000702

Probabilistic approach for durable design of concrete cover / Jonathan Mai-Nhu in European journal of environmental and civil engineering, Vol. 16 N° 3-4 (Mars/Avril 2012) 

Public ISBD [article]  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

A review of continuum damage modelling for dam analysis / Eric Bourdarot in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 805-822 Titre : A review of continuum damage modelling for dam analysis : Main steps of a fruitful university-industry collaboration leading to an integrated model applicable to AAR affected structures Type de document : texte imprimé Auteurs : Eric Bourdarot, Auteur ; Alain Sellier, Auteur ; Stéphane Multon, Auteur Année de publication : 2011 Article en page(s) : pp. 805-822 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Dam  Concrete  Damage  Swelling  Modelling  Alkali-aggregate  reactions Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This article presents the different steps of a research process initiated in the field of dam engineering, through collaboration between EDF and ENS Cachan, following Jacky Mazars' pioneering work on the application of the damage concept to concrete structure modelling. Considering the importance of concrete swelling phenomena for the long-term behaviour of concrete dams, special efforts have been devoted to the development of a rheologic model in this field. This paper explains how the research performed contributed to the elaboration and the justification of the main equations included. An application to the Temple-sur-Lot dam is presented. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] A review of continuum damage modelling for dam analysis : Main steps of a fruitful university-industry collaboration leading to an integrated model applicable to AAR affected structures [texte imprimé] / Eric Bourdarot, Auteur ; Alain Sellier, Auteur ; Stéphane Multon, Auteur . - 2011 . - pp. 805-822. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 805-822 Mots-clés : Dam  Concrete  Damage  Swelling  Modelling  Alkali-aggregate  reactions Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This article presents the different steps of a research process initiated in the field of dam engineering, through collaboration between EDF and ENS Cachan, following Jacky Mazars' pioneering work on the application of the damage concept to concrete structure modelling. Considering the importance of concrete swelling phenomena for the long-term behaviour of concrete dams, special efforts have been devoted to the development of a rheologic model in this field. This paper explains how the research performed contributed to the elaboration and the justification of the main equations included. An application to the Temple-sur-Lot dam is presented. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

Simplified models for the engineering of concrete formulations in a marine environment through a probabilistic method / Fabrice Deby in European journal of environmental and civil engineering, Vol. 16 N° 3-4 (Mars/Avril 2012) 

Public ISBD [article]  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