Les Inscriptions à la Bibliothèque sont ouvertes en
ligne via le site: https://biblio.enp.edu.dz
Les Réinscriptions se font à :
• La Bibliothèque Annexe pour les étudiants en
2ème Année CPST
• La Bibliothèque Centrale pour les étudiants en Spécialités
A partir de cette page vous pouvez :
Retourner au premier écran avec les recherches... |
Détail de l'auteur
Auteur A. Burkert
Documents disponibles écrits par cet auteur
Affiner la rechercheDamage of stainless steel bars due to atmospheric corrosion / A. Burkert in Materials and corrosion, Vol. 63 N° 3 (Mars 2012)
[article]
in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 264–270
Titre : Damage of stainless steel bars due to atmospheric corrosion Type de document : texte imprimé Auteurs : A. Burkert, Auteur ; J. Lehmann, Auteur Année de publication : 2012 Article en page(s) : pp. 264–270 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Atmospheric corrosion; EPR test; failure; intercrystalline corrosion; stainless steel Résumé : In addition to constructional requirements in civil engineering stainless steels often have to fulfil high visual demands. Unexpected impairments of the visual appearance of stainless steels under low corrosive conditions are a widespread problem today. Frequently it is supposed that this is caused by changes in the alloy composition, worse environmental conditions or improper handling. Within a research project the systematic investigation of several cases of damaged stainless steel bars has shown that the reasons are based on well-known material defects like chemical inhomogeneities (e.g. precipitations or local carburization) or geometrical defects (e.g. undercuts, rolling defects or shell formation). Thus, the failures could be clearly identified as production failures of the respective semi-finished products. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005701/abstract [article] Damage of stainless steel bars due to atmospheric corrosion [texte imprimé] / A. Burkert, Auteur ; J. Lehmann, Auteur . - 2012 . - pp. 264–270.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 264–270
Mots-clés : Atmospheric corrosion; EPR test; failure; intercrystalline corrosion; stainless steel Résumé : In addition to constructional requirements in civil engineering stainless steels often have to fulfil high visual demands. Unexpected impairments of the visual appearance of stainless steels under low corrosive conditions are a widespread problem today. Frequently it is supposed that this is caused by changes in the alloy composition, worse environmental conditions or improper handling. Within a research project the systematic investigation of several cases of damaged stainless steel bars has shown that the reasons are based on well-known material defects like chemical inhomogeneities (e.g. precipitations or local carburization) or geometrical defects (e.g. undercuts, rolling defects or shell formation). Thus, the failures could be clearly identified as production failures of the respective semi-finished products. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005701/abstract Electrochemical investigations on the corrosion behaviour of galvanized reinforcing steels in concrete with chromate-reduced cements / G. Ebell in Materials and corrosion, Vol. 63 N° 9 (Septembre 2012)
[article]
in Materials and corrosion > Vol. 63 N° 9 (Septembre 2012) . - pp. 791–802
Titre : Electrochemical investigations on the corrosion behaviour of galvanized reinforcing steels in concrete with chromate-reduced cements Type de document : texte imprimé Auteurs : G. Ebell, Auteur ; A. Burkert, Auteur ; J. Lehmann, Auteur Année de publication : 2013 Article en page(s) : pp. 791–802 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Cement; chromate; concrete; electrochemical measurements; galvanized steel; polarization; pull-out tests; reinforcing steel; zinc Résumé : The reduction of the chromate contents in cements affects the electrochemical reactions of galvanized reinforcing steels in fresh concrete. By means of electrochemical measurements and bar pull-out tests the effect of chromates on the formation of protective coatings at the zinc and the bond behaviour have been investigated using chromate-containing and chromate-reduced cements. The results have shown that the bond zone was affected as a result of chromate reduction for cement types CEM I and CEM II. The disturbance to the bond zone should be considered as long-term in relation to the pore structure which is formed. The effects on the bond are largely compensated for as the concrete ages. The results of the related bond strength with displacement paths of 0.1 and 0.5 mm, respectively, are still within the range of expected figures for non-galvanized reinforcing steel despite the structural disturbance. Under practical aspects it is not necessary that the existing structural disturbance with respect to bond strength is taken into consideration. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106311/abstract [article] Electrochemical investigations on the corrosion behaviour of galvanized reinforcing steels in concrete with chromate-reduced cements [texte imprimé] / G. Ebell, Auteur ; A. Burkert, Auteur ; J. Lehmann, Auteur . - 2013 . - pp. 791–802.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 9 (Septembre 2012) . - pp. 791–802
Mots-clés : Cement; chromate; concrete; electrochemical measurements; galvanized steel; polarization; pull-out tests; reinforcing steel; zinc Résumé : The reduction of the chromate contents in cements affects the electrochemical reactions of galvanized reinforcing steels in fresh concrete. By means of electrochemical measurements and bar pull-out tests the effect of chromates on the formation of protective coatings at the zinc and the bond behaviour have been investigated using chromate-containing and chromate-reduced cements. The results have shown that the bond zone was affected as a result of chromate reduction for cement types CEM I and CEM II. The disturbance to the bond zone should be considered as long-term in relation to the pore structure which is formed. The effects on the bond are largely compensated for as the concrete ages. The results of the related bond strength with displacement paths of 0.1 and 0.5 mm, respectively, are still within the range of expected figures for non-galvanized reinforcing steel despite the structural disturbance. Under practical aspects it is not necessary that the existing structural disturbance with respect to bond strength is taken into consideration. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106311/abstract Monitoring of corrosion processes in chloride contaminated mortar by electrochemical measurements and X-ray tomography / M. Beck in Materials and corrosion, Vol. 61 N° 6 (Juin 2010)
[article]
in Materials and corrosion > Vol. 61 N° 6 (Juin 2010) . - pp. 475–479
Titre : Monitoring of corrosion processes in chloride contaminated mortar by electrochemical measurements and X-ray tomography Type de document : texte imprimé Auteurs : M. Beck, Auteur ; J. Goebbels, Auteur ; A. Burkert, Auteur Année de publication : 2010 Article en page(s) : pp. 475–479 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : contaminated mortar; electrochemical measurements; pitting corrosion; X-ray tomography Résumé : Corrosion of steel reinforcement in concrete exposed to chloride containing environments is a serious problem in civil engineering practice. Electrochemical methods, e.g., potential mapping, provide information whether the steel reinforcement is still passive or depassivation has been initiated. By applying such techniques no information on the type of corrosion, its extent and distribution of corrosion products is available. Particular the corrosion progress is a significant problem. Especially in the case of macrocell corrosion in reinforced concrete structures, the development at the anode cannot be separated into corrosion damage resulting from macrocell corrosion or self-corrosion. Until now also in laboratory tests it is impossible to collect such information without destroying specimens after electrochemical testing was performed. To overcome this problem it was tried to study the steel surface within the mortar specimens by X-ray tomography (CT). Within the scope of these investigations it could be shown, that X-ray tomography is suitable to make corrosion pits and their development visible which are embedded in a mortar with a cover thickness of about 35 mm. In this publication the time-dependent corrosion damage of reinforced steel is documented by X-ray tomography. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905364/abstract [article] Monitoring of corrosion processes in chloride contaminated mortar by electrochemical measurements and X-ray tomography [texte imprimé] / M. Beck, Auteur ; J. Goebbels, Auteur ; A. Burkert, Auteur . - 2010 . - pp. 475–479.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 61 N° 6 (Juin 2010) . - pp. 475–479
Mots-clés : contaminated mortar; electrochemical measurements; pitting corrosion; X-ray tomography Résumé : Corrosion of steel reinforcement in concrete exposed to chloride containing environments is a serious problem in civil engineering practice. Electrochemical methods, e.g., potential mapping, provide information whether the steel reinforcement is still passive or depassivation has been initiated. By applying such techniques no information on the type of corrosion, its extent and distribution of corrosion products is available. Particular the corrosion progress is a significant problem. Especially in the case of macrocell corrosion in reinforced concrete structures, the development at the anode cannot be separated into corrosion damage resulting from macrocell corrosion or self-corrosion. Until now also in laboratory tests it is impossible to collect such information without destroying specimens after electrochemical testing was performed. To overcome this problem it was tried to study the steel surface within the mortar specimens by X-ray tomography (CT). Within the scope of these investigations it could be shown, that X-ray tomography is suitable to make corrosion pits and their development visible which are embedded in a mortar with a cover thickness of about 35 mm. In this publication the time-dependent corrosion damage of reinforced steel is documented by X-ray tomography. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905364/abstract