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Compression triaxial behavior of concrete / Cedric Poinard in European journal of environmental and civil engineering, Vol. 16 Supplément N° 1 (Juin 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 Supplément N° 1 (Juin 2012) . - pp. s115-s136 Titre : Compression triaxial behavior of concrete : The role of the mesostructure by analysis of X-ray tomographic images Type de document : texte imprimé Auteurs : Cedric Poinard, Auteur ; Ewa Piotrowska, Auteur ; Yann Malécot, Auteur Année de publication : 2012 Article en page(s) : pp. s115-s136 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete  Triaxial  loading  X-ray  tomography  Porosity  Damage  mechanisms Résumé : This paper is intended to assess the mesostructural damage mechanisms of concrete under hydrostatic and triaxial loadings. Such a study is possible thanks to two state-of-the-art laboratory instruments: a high-pressure triaxial press, and an X-ray computed tomography instrument. The laboratory protocol consists of scanning the concrete prior to the initial loading and after each cycle. An analysis of the resulting images indicates that under high hydrostatic loading, significant damage is visible in cement paste at the mesoscopic scale. For two triaxial tests conducted at 50 and 650 MPa of confining pressure, results reveal major differences in both damage and failure mechanisms. At the lower pressure, shear loading creates a localised failure mechanism characterised by sliding on an inclined plane, whereas at the higher pressure, the strain and damage mode are much more homogeneous with a failure localisation after unloading. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.682458 [article] Compression triaxial behavior of concrete : The role of the mesostructure by analysis of X-ray tomographic images [texte imprimé] / Cedric Poinard, Auteur ; Ewa Piotrowska, Auteur ; Yann Malécot, Auteur . - 2012 . - pp. s115-s136. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 Supplément N° 1 (Juin 2012) . - pp. s115-s136 Mots-clés : Concrete  Triaxial  loading  X-ray  tomography  Porosity  Damage  mechanisms Résumé : This paper is intended to assess the mesostructural damage mechanisms of concrete under hydrostatic and triaxial loadings. Such a study is possible thanks to two state-of-the-art laboratory instruments: a high-pressure triaxial press, and an X-ray computed tomography instrument. The laboratory protocol consists of scanning the concrete prior to the initial loading and after each cycle. An analysis of the resulting images indicates that under high hydrostatic loading, significant damage is visible in cement paste at the mesoscopic scale. For two triaxial tests conducted at 50 and 650 MPa of confining pressure, results reveal major differences in both damage and failure mechanisms. At the lower pressure, shear loading creates a localised failure mechanism characterised by sliding on an inclined plane, whereas at the higher pressure, the strain and damage mode are much more homogeneous with a failure localisation after unloading. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.682458