Documents disponibles écrits par cet auteur

Investigation of slag cement quality through the analysis of its efficiency coefficient / Karim Ezziane in European journal of environmental and civil engineering, Vol. 15 N° 10 (Octobre 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 10 (Octobre 2011) . - pp. 1393-1411 Titre : Investigation of slag cement quality through the analysis of its efficiency coefficient Titre original : Investigation de la qualité du laitier du ciment par l’analyse de son coefficient d’efficacité Type de document : texte imprimé Auteurs : Karim Ezziane, Auteur ; El Hadj Kadri, Auteur ; Rafat Siddique, Auteur Année de publication : 2012 Article en page(s) : pp. 1393-1411 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cement  Compressive  strength  Concrete  Efficiency  coefficient  Equivalent  binder  Model  Slag Résumé : The research efforts on the strength development of slag cements have seen a great progress. Such evolution prediction constitutes a major concern of the construction engineers interested in predicting the removing of the framework or the application of the pre-stressing at suitable ages. The slag concrete strength prediction, using some models, has been studied using the equivalent binder concept. This has led to define an efficiency coefficient of slag which determines the latter according to the cement. Results of this investigation indicates that this coefficient characterizes well the slag and enables to predict the slag cement strength at different ages and replacement rate from the reference cement made without slag. This coefficient has been identified according to the age, the replacement rate, the specific surface area of the slag and the curing temperature. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=17022 [article] Investigation of slag cement quality through the analysis of its efficiency coefficient = Investigation de la qualité du laitier du ciment par l’analyse de son coefficient d’efficacité [texte imprimé] / Karim Ezziane, Auteur ; El Hadj Kadri, Auteur ; Rafat Siddique, Auteur . - 2012 . - pp. 1393-1411. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 10 (Octobre 2011) . - pp. 1393-1411 Mots-clés : Cement  Compressive  strength  Concrete  Efficiency  coefficient  Equivalent  binder  Model  Slag Résumé : The research efforts on the strength development of slag cements have seen a great progress. Such evolution prediction constitutes a major concern of the construction engineers interested in predicting the removing of the framework or the application of the pre-stressing at suitable ages. The slag concrete strength prediction, using some models, has been studied using the equivalent binder concept. This has led to define an efficiency coefficient of slag which determines the latter according to the cement. Results of this investigation indicates that this coefficient characterizes well the slag and enables to predict the slag cement strength at different ages and replacement rate from the reference cement made without slag. This coefficient has been identified according to the age, the replacement rate, the specific surface area of the slag and the curing temperature. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=17022

Relationships between concrete composition and boundary layer composition to optimise concrete pumpability / Tien-Tung Ngo in European journal of environmental and civil engineering, Vol. 16 N° 2 (Février 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 157-177 Titre : Relationships between concrete composition and boundary layer composition to optimise concrete pumpability Type de document : texte imprimé Auteurs : Tien-Tung Ngo, Auteur ; El Hadj Kadri, Auteur ; François Cussigh, Auteur Année de publication : 2012 Article en page(s) : pp. 157-177 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Pumpability  Tribometer  Interface  friction  Boundary  layer  Viscous  constant  Concrete Résumé : Concrete pumpability is determined by the friction at the interface between the concrete and the wall of the pumping pipes (which are generally made of steel); called the concrete–steel interface. This friction is related directly to the thickness and composition of the boundary layer (BL) that occurs during the movement of fresh concrete in a pipe. These BL characteristics are rigorously linked with concrete composition parameters. To highlight this complicated relationship, an apparatus called a ‘tribometer’ was used in two experimental programs. This apparatus allows measurement of the steel–concrete interface friction and deduction of interface parameters (also called the pumping parameters), namely viscous constant and interface yield stress. The first program focuses on the effect of the concrete composition on pumping parameters, and the second program focuses on the relationships between the concrete composition and the BL composition. The results of the first program show that increases in cement paste volume, water/cement ratio and super-plasticiser dosage enhance concrete pumpability. Increased content of fine sand in concrete induces negative effects on the interface frictions and on the pumpability. The results of the second program show that the BL is formed by water, cement and fine sand particles with a diameter lower than 0.25 mm. It also shows that the proportions of water and cement volume in BL and micro-concrete (concrete with the largest grain diameter lower than 0.25 mm) are almost the same. The relative enrichment produced by fine sand in the BL decreases with increasing proportion of fine sand volume in the concrete. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.666910 [article] Relationships between concrete composition and boundary layer composition to optimise concrete pumpability [texte imprimé] / Tien-Tung Ngo, Auteur ; El Hadj Kadri, Auteur ; François Cussigh, Auteur . - 2012 . - pp. 157-177. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 157-177 Mots-clés : Pumpability  Tribometer  Interface  friction  Boundary  layer  Viscous  constant  Concrete Résumé : Concrete pumpability is determined by the friction at the interface between the concrete and the wall of the pumping pipes (which are generally made of steel); called the concrete–steel interface. This friction is related directly to the thickness and composition of the boundary layer (BL) that occurs during the movement of fresh concrete in a pipe. These BL characteristics are rigorously linked with concrete composition parameters. To highlight this complicated relationship, an apparatus called a ‘tribometer’ was used in two experimental programs. This apparatus allows measurement of the steel–concrete interface friction and deduction of interface parameters (also called the pumping parameters), namely viscous constant and interface yield stress. The first program focuses on the effect of the concrete composition on pumping parameters, and the second program focuses on the relationships between the concrete composition and the BL composition. The results of the first program show that increases in cement paste volume, water/cement ratio and super-plasticiser dosage enhance concrete pumpability. Increased content of fine sand in concrete induces negative effects on the interface frictions and on the pumpability. The results of the second program show that the BL is formed by water, cement and fine sand particles with a diameter lower than 0.25 mm. It also shows that the proportions of water and cement volume in BL and micro-concrete (concrete with the largest grain diameter lower than 0.25 mm) are almost the same. The relative enrichment produced by fine sand in the BL decreases with increasing proportion of fine sand volume in the concrete. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.666910