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

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