Documents disponibles écrits par cet auteur

Accelerated leaching of cementitious materials using ammonium nitrate (6M) / Stéphane Poyet 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. 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

Experimental investigation of the effect of temperature on the first desorption isotherm of concrete / Stéphane Poyet in Cement and concrete research, Vol. 39 N° 11 (Novembre 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 11 (Novembre 2009) . - pp. 1052–1059 Titre : Experimental investigation of the effect of temperature on the first desorption isotherm of concrete Type de document : texte imprimé Auteurs : Stéphane Poyet, Auteur Année de publication : 2010 Article en page(s) : pp. 1052–1059 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Temperature;  Surface  area;  Adsorption;  Durability;  Concrete;  Radioactive  waste;  Waste  management Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : In the framework of the radioactive waste management in France, interim storage concrete structures should be submitted to temperatures up to 80 °C and subsequent desiccation. The impact of temperature on the sorption properties of concretes has been poorly studied and results are scarce. An experimental campaign was thus carried out to characterize the first desorption isotherms of a modern concrete at 30 °C and 80 °C. The results show a significant influence of the temperature increase that will have to be accounted for the durability assessment of the long-term interim storage concrete structures. Investigating the causes of these modifications, it appeared that desorption induced by temperature might be the principal mechanism rather than microstructure alteration and water properties evolution. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001495 [article] Experimental investigation of the effect of temperature on the first desorption isotherm of concrete [texte imprimé] / Stéphane Poyet, Auteur . - 2010 . - pp. 1052–1059. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 11 (Novembre 2009) . - pp. 1052–1059 Mots-clés : Temperature;  Surface  area;  Adsorption;  Durability;  Concrete;  Radioactive  waste;  Waste  management Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : In the framework of the radioactive waste management in France, interim storage concrete structures should be submitted to temperatures up to 80 °C and subsequent desiccation. The impact of temperature on the sorption properties of concretes has been poorly studied and results are scarce. An experimental campaign was thus carried out to characterize the first desorption isotherms of a modern concrete at 30 °C and 80 °C. The results show a significant influence of the temperature increase that will have to be accounted for the durability assessment of the long-term interim storage concrete structures. Investigating the causes of these modifications, it appeared that desorption induced by temperature might be the principal mechanism rather than microstructure alteration and water properties evolution. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001495

Modelling the influence of temperature on accelerated leaching in ammonium nitrate / Thomas de Larrard 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. 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

Temperature dependence of the sorption isotherms of cement-based materials: Heat of sorption and Clausius–Clapeyron formula / Stéphane Poyet in Cement and concrete research, Vol. 39 N° 11 (Novembre 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 11 (Novembre 2009) . - pp. 1060–1067 Titre : Temperature dependence of the sorption isotherms of cement-based materials: Heat of sorption and Clausius–Clapeyron formula Type de document : texte imprimé Auteurs : Stéphane Poyet, Auteur ; Sébastien Charles, Auteur Année de publication : 2010 Article en page(s) : pp. 1060–1067 Note générale : Génie Civil Langues : Anglais (eng) Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : In the field of radioactive waste management the concrete structures are expected to undergo significant heating due to the waste thermal power and significant drying (in the French design, the temperature is not expected to exceed 80 °C). The durability assessment of such structures thus requires the knowledge of the evolution of the water vapour sorption properties versus temperature. The latter can be easily estimated using the Clausius–Clapeyron (CC) equation: the approach presented hereafter requires the knowledge of the isosteric heat of adsorption and one desorption isotherm (at ambient or any other temperature). Moreover, it is shown that using the CC equation and the desorption isotherms at two different temperatures, it is possible to estimate accurately the desorption isotherm at any other temperature. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001768 [article] Temperature dependence of the sorption isotherms of cement-based materials: Heat of sorption and Clausius–Clapeyron formula [texte imprimé] / Stéphane Poyet, Auteur ; Sébastien Charles, Auteur . - 2010 . - pp. 1060–1067. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 11 (Novembre 2009) . - pp. 1060–1067 Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : In the field of radioactive waste management the concrete structures are expected to undergo significant heating due to the waste thermal power and significant drying (in the French design, the temperature is not expected to exceed 80 °C). The durability assessment of such structures thus requires the knowledge of the evolution of the water vapour sorption properties versus temperature. The latter can be easily estimated using the Clausius–Clapeyron (CC) equation: the approach presented hereafter requires the knowledge of the isosteric heat of adsorption and one desorption isotherm (at ambient or any other temperature). Moreover, it is shown that using the CC equation and the desorption isotherms at two different temperatures, it is possible to estimate accurately the desorption isotherm at any other temperature. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001768

Visual parameters of chloride-induced corrosion of reinforced concrete structures / Sébastien Charles in European journal of environmental and civil engineering, Vol. 15 N° 1 (Janvier 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 1 (Janvier 2011) . - pp. 9-24 Titre : Visual parameters of chloride-induced corrosion of reinforced concrete structures Type de document : texte imprimé Auteurs : Sébastien Charles, Auteur ; Valérie L'Hostis, Auteur ; Stéphane Poyet, Auteur Année de publication : 2011 Article en page(s) : pp. 9-24 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Reinforced  concrete  Corrosion  Visual  inspection  Marine  environment Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Corrosion is the major cause of reinforced concrete structures degradation: the pressure generated by oxides formation together with section loss can eventually lead to cracking and the fall in the structure bearing capacity and then jeopardize its service life. The first method for the corrosion state characterisation of concrete structures is to check periodically for visual signs of corrosion on the concrete facing (rust stains and cracks). The goal of this study is to assess the ability of visual inspection to detect and quantify reinforcement corrosion in concrete structures. The data acquired in the framework of the "Poutres de la Rance" benchmark were re-analysed to link the visual signs of corrosion to its real internal consequences (section loss, corroded length...etc.). The results show that, in our case (marine environment), visual inspection does not yield efficient assessment of the real corrosion state and that other non-destructive techniques must be used in order to gain confidence in the diagnosis. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=15661 [article] Visual parameters of chloride-induced corrosion of reinforced concrete structures [texte imprimé] / Sébastien Charles, Auteur ; Valérie L'Hostis, Auteur ; Stéphane Poyet, Auteur . - 2011 . - pp. 9-24. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 1 (Janvier 2011) . - pp. 9-24 Mots-clés : Reinforced  concrete  Corrosion  Visual  inspection  Marine  environment Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Corrosion is the major cause of reinforced concrete structures degradation: the pressure generated by oxides formation together with section loss can eventually lead to cracking and the fall in the structure bearing capacity and then jeopardize its service life. The first method for the corrosion state characterisation of concrete structures is to check periodically for visual signs of corrosion on the concrete facing (rust stains and cracks). The goal of this study is to assess the ability of visual inspection to detect and quantify reinforcement corrosion in concrete structures. The data acquired in the framework of the "Poutres de la Rance" benchmark were re-analysed to link the visual signs of corrosion to its real internal consequences (section loss, corroded length...etc.). The results show that, in our case (marine environment), visual inspection does not yield efficient assessment of the real corrosion state and that other non-destructive techniques must be used in order to gain confidence in the diagnosis. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=15661