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Cement and Concrete Research Volume 39, Issue 6, June 2009, Pages 501–509 Cover image Study of mineralogy and leaching behavior of stabilized/solidified sludge using differential acid neutralization analysis: Part II: Use of numerical simulation as an aid tool for cementitious hydrates identification / O. Peyronnard 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. Titre : Cement and Concrete Research Volume 39, Issue 6, June 2009, Pages 501–509 Cover image Study of mineralogy and leaching behavior of stabilized/solidified sludge using differential acid neutralization analysis: Part II: Use of numerical simulation as an aid tool for cementitious hydrates identification Type de document : texte imprimé Auteurs : O. Peyronnard, Auteur ; D. Blanc, Auteur ; M. Benzaazoua, Auteur Année de publication : 2009 Article en page(s) : pp. Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Waste  management  ;  Modeling  ;  Mineral  assemblage;  Fly  ash  ;  Portland  cement Résumé : In this work, we propose a methodology coupling differential acid neutralization analysis, chemical analysis of selected leachates and numerical simulation to identify the minerals controlling the leaching behavior of stabilized hydroxide sludge. This second part deals with the use of numerical simulation as an aid tool for the identification of the minerals. The framework for minerals identification is based on the study of minerals stability in function of the geochemical context using numerical simulation. A mineral assemblage permitting the simulation of a pH dependence leaching test (acid neutralization and release of elements) has been identified for the four studied cement pastes. Therefore, the proposed methodology is a pertinent tool for the modeling of the leaching behavior of inorganic wastes. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S000888460900074X [article] Cement and Concrete Research Volume 39, Issue 6, June 2009, Pages 501–509 Cover image Study of mineralogy and leaching behavior of stabilized/solidified sludge using differential acid neutralization analysis: Part II: Use of numerical simulation as an aid tool for cementitious hydrates identification [texte imprimé] / O. Peyronnard, Auteur ; D. Blanc, Auteur ; M. Benzaazoua, Auteur . - 2009 . - pp. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 6 (Juin 2009) . - pp. Mots-clés : Waste  management  ;  Modeling  ;  Mineral  assemblage;  Fly  ash  ;  Portland  cement Résumé : In this work, we propose a methodology coupling differential acid neutralization analysis, chemical analysis of selected leachates and numerical simulation to identify the minerals controlling the leaching behavior of stabilized hydroxide sludge. This second part deals with the use of numerical simulation as an aid tool for the identification of the minerals. The framework for minerals identification is based on the study of minerals stability in function of the geochemical context using numerical simulation. A mineral assemblage permitting the simulation of a pH dependence leaching test (acid neutralization and release of elements) has been identified for the four studied cement pastes. Therefore, the proposed methodology is a pertinent tool for the modeling of the leaching behavior of inorganic wastes. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S000888460900074X

Study of mineralogy and leaching behavior of stabilized/solidified sludge using differential acid neutralization analysis: Part I: Experimental study / O. Peyronnard in Cement and concrete research, Vol. 39 N° 7 (Juillet 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 7 (Juillet 2009) . - pp. 600–609 Titre : Study of mineralogy and leaching behavior of stabilized/solidified sludge using differential acid neutralization analysis: Part I: Experimental study Type de document : texte imprimé Auteurs : O. Peyronnard, Auteur ; M. Benzaazoua, Auteur ; Blanc, André, Auteur Année de publication : 2009 Article en page(s) : pp. 600–609 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Waste  management;  Characterization;  Stability;  Fly  ash;  Portland  cement Résumé : In this work, differential acid neutralization analysis, chemical analysis of selected leachates and mineralogical study (XRD and SEM-EDS) are combined to investigate the relationship between mineralogy and leaching behavior of hydroxide sludge doped in Zn and Cr stabilized/solidified by hydraulic binders. The leaching behavior of stabilized hydroxide sludge is controlled by the dissolution of portlandite (pH ~ 12) followed by the dissolution of AFt/AFm and hydrogarnets (pH between 12 and 10) and finally the dissolution of ettringite and of the siliceous matrix of C–S–H (pH < 10). The zinc behavior is independent of the main components and is controlled by the dissolution of calcium hydroxizincate and its reprecipitation as hydroxyde or its adsorption on C–S–H. Chromium release is linked to the sulfate one due to a substitution in AFt/AFm phases. The proposed combination of tests is highly pertinent to establish the links between mineralogy and leaching behavior. Nevertheless, the hypotheses formulated are insufficient to implement a behavioral model to describe the leaching behavior. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000751 [article] Study of mineralogy and leaching behavior of stabilized/solidified sludge using differential acid neutralization analysis: Part I: Experimental study [texte imprimé] / O. Peyronnard, Auteur ; M. Benzaazoua, Auteur ; Blanc, André, Auteur . - 2009 . - pp. 600–609. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 7 (Juillet 2009) . - pp. 600–609 Mots-clés : Waste  management;  Characterization;  Stability;  Fly  ash;  Portland  cement Résumé : In this work, differential acid neutralization analysis, chemical analysis of selected leachates and mineralogical study (XRD and SEM-EDS) are combined to investigate the relationship between mineralogy and leaching behavior of hydroxide sludge doped in Zn and Cr stabilized/solidified by hydraulic binders. The leaching behavior of stabilized hydroxide sludge is controlled by the dissolution of portlandite (pH ~ 12) followed by the dissolution of AFt/AFm and hydrogarnets (pH between 12 and 10) and finally the dissolution of ettringite and of the siliceous matrix of C–S–H (pH < 10). The zinc behavior is independent of the main components and is controlled by the dissolution of calcium hydroxizincate and its reprecipitation as hydroxyde or its adsorption on C–S–H. Chromium release is linked to the sulfate one due to a substitution in AFt/AFm phases. The proposed combination of tests is highly pertinent to establish the links between mineralogy and leaching behavior. Nevertheless, the hypotheses formulated are insufficient to implement a behavioral model to describe the leaching behavior. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000751