Documents disponibles écrits par cet auteur

Application of nanoindentation testing to study of the interfacial transition zone in steel fiber reinforced mortar / Xiao Hui Wang in Cement and concrete research, Vol. 39 N° 8 (Août 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 8 (Août 2009) . - pp. 701–715 Titre : Application of nanoindentation testing to study of the interfacial transition zone in steel fiber reinforced mortar Type de document : texte imprimé Auteurs : Xiao Hui Wang, Auteur ; Stefan Jacobsen, Auteur ; Jian Ying He, Auteur Année de publication : 2009 Article en page(s) : pp. 701–715 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Nanoindentation;  Scanning  Electron  Microscopy  (SEM);Interfacial  transition  zone  (ITZ);  Elastic  modulus  and  hardness;  Steel  fiber  reinforced  mortar Résumé : The characteristics of the profiles of elastic modulus and hardness of the steel fiber–matrix and fiber–matrix–aggregate interfacial zones in steel fiber reinforced mortars have been investigated by using nanoindentation and Scanning Electron Microscopy (SEM), where two sets of parameters, i.e. water/binder ratio and content of silica fume were considered. Different interfacial bond conditions in the interfacial transition zones (ITZ) are discussed. For sample without silica fume, efficient interfacial bonds across the steel fiber–matrix and fiber–matrix–aggregate interfaces are shown in low water/binder ratio mortar; while in high water/binder ratio mortar, due to the discontinuous bleeding voids underneath the fiber, the fiber–matrix bond is not very good. On the other hand, for sample with silica fume, the addition of 10% silica fume leads to no distinct presence of weak ITZ in the steel fiber–matrix interface; but the effect of the silica fume on the steel fiber–matrix–aggregate interfacial zone is not obvious due to voids in the vicinity of steel fiber. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001057 [article] Application of nanoindentation testing to study of the interfacial transition zone in steel fiber reinforced mortar [texte imprimé] / Xiao Hui Wang, Auteur ; Stefan Jacobsen, Auteur ; Jian Ying He, Auteur . - 2009 . - pp. 701–715. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 8 (Août 2009) . - pp. 701–715 Mots-clés : Nanoindentation;  Scanning  Electron  Microscopy  (SEM);Interfacial  transition  zone  (ITZ);  Elastic  modulus  and  hardness;  Steel  fiber  reinforced  mortar Résumé : The characteristics of the profiles of elastic modulus and hardness of the steel fiber–matrix and fiber–matrix–aggregate interfacial zones in steel fiber reinforced mortars have been investigated by using nanoindentation and Scanning Electron Microscopy (SEM), where two sets of parameters, i.e. water/binder ratio and content of silica fume were considered. Different interfacial bond conditions in the interfacial transition zones (ITZ) are discussed. For sample without silica fume, efficient interfacial bonds across the steel fiber–matrix and fiber–matrix–aggregate interfaces are shown in low water/binder ratio mortar; while in high water/binder ratio mortar, due to the discontinuous bleeding voids underneath the fiber, the fiber–matrix bond is not very good. On the other hand, for sample with silica fume, the addition of 10% silica fume leads to no distinct presence of weak ITZ in the steel fiber–matrix interface; but the effect of the silica fume on the steel fiber–matrix–aggregate interfacial zone is not obvious due to voids in the vicinity of steel fiber. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001057

Flow conditions of fresh mortar and concrete in different pipes / Stefan Jacobsen 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. 997–1006 Titre : Flow conditions of fresh mortar and concrete in different pipes Type de document : texte imprimé Auteurs : Stefan Jacobsen, Auteur ; Lars Haugan, Auteur ; Tor Arne Hammer, Auteur Année de publication : 2010 Article en page(s) : pp. 997–1006 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Fresh  concrete;  Workability;  Rheology;  Pumping Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The variation in fresh concrete flow rate over the pipe cross section was investigated on differently coloured and highly flowable concrete mixes flowing through pipes of different materials (rubber, steel, acryl). First, uncoloured (gray) concrete was poured through the pipe and the pipe blocked. Similar but coloured (black) concrete was then poured into the pipe filled with gray concrete, flowing after the gray concrete for a while before being blocked and hardened. The advance of the colouring along the pipe wall (showing boundary flow rate) was observed on the moulded concrete surface appearing after removing the pipe from the hardened concrete. The shapes of the interfaces between uncoloured and coloured concrete (showing variation of flow rate over the pipe cross section) were observed on sawn surfaces of concrete half cylinders cut along the length axes of the concrete-filled pipe. Flow profiles over the pipe cross section were clearly seen with maximum flow rates near the centre of the pipe and low flow rate at the pipe wall (typically rubber pipe with reference concrete without silica fume and/or stabilizers). More plug-shaped profiles, with long slip layers and less variation of flow rate over the cross section, were also seen (typically in smooth acrylic pipes). Flow rate, amount of concrete sticking to the wall after flow and SEM-images of pipe surface roughness were observed, illustrating the problem of testing full scale pumping. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.bledco.com/business/Rouiba/education/Enseignement-universitaire/ECOLE [...] [article] Flow conditions of fresh mortar and concrete in different pipes [texte imprimé] / Stefan Jacobsen, Auteur ; Lars Haugan, Auteur ; Tor Arne Hammer, Auteur . - 2010 . - pp. 997–1006. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 11 (Novembre 2009) . - pp. 997–1006 Mots-clés : Fresh  concrete;  Workability;  Rheology;  Pumping Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The variation in fresh concrete flow rate over the pipe cross section was investigated on differently coloured and highly flowable concrete mixes flowing through pipes of different materials (rubber, steel, acryl). First, uncoloured (gray) concrete was poured through the pipe and the pipe blocked. Similar but coloured (black) concrete was then poured into the pipe filled with gray concrete, flowing after the gray concrete for a while before being blocked and hardened. The advance of the colouring along the pipe wall (showing boundary flow rate) was observed on the moulded concrete surface appearing after removing the pipe from the hardened concrete. The shapes of the interfaces between uncoloured and coloured concrete (showing variation of flow rate over the pipe cross section) were observed on sawn surfaces of concrete half cylinders cut along the length axes of the concrete-filled pipe. Flow profiles over the pipe cross section were clearly seen with maximum flow rates near the centre of the pipe and low flow rate at the pipe wall (typically rubber pipe with reference concrete without silica fume and/or stabilizers). More plug-shaped profiles, with long slip layers and less variation of flow rate over the cross section, were also seen (typically in smooth acrylic pipes). Flow rate, amount of concrete sticking to the wall after flow and SEM-images of pipe surface roughness were observed, illustrating the problem of testing full scale pumping. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.bledco.com/business/Rouiba/education/Enseignement-universitaire/ECOLE [...]