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Crack effects on gas and water permeability of concretes / Vincent Picandet 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. 537–547 Titre : Crack effects on gas and water permeability of concretes Type de document : texte imprimé Auteurs : Vincent Picandet, Auteur ; Abdelhafid Khelidj, Auteur ; Hervé Bellegou, Auteur Année de publication : 2009 Article en page(s) : pp. 537–547 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Permeability;  Microcracking;  Durability;  High-performance  oncrete;  Fiber  reinforcement Résumé : The relationship between load-induced cracking and concrete permeability is studied. Ordinary concrete (OC) and high-performance concrete (HPC), including steel fiber-reinforced concrete (HPFRC), are used. Two discs, 50 mm-thick slices, cut from 110–220 mm cylindrical specimens are diametrically loaded, as for a normal splitting test. The lateral displacement, also called the crack opening displacement (COD) is monitored for each loading cycle. After unloading, gas and finally water permeability tests are both performed, using constant head permeameter, to compare the influence of the percolating fluid and the COD. Due to the wide range of measured gas flow, Klinkenberg's and Dupuit-Forcheimer's laws are applied to compute the intrinsic gas permeability. Results suggest it increases proportionally to the cube of the COD and it matches water permeability, if only the first water percolating time is considered. The roughness parameter of the cracks induced in each concrete, is compared and discussed. REFERENCE : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000696 [article] Crack effects on gas and water permeability of concretes [texte imprimé] / Vincent Picandet, Auteur ; Abdelhafid Khelidj, Auteur ; Hervé Bellegou, Auteur . - 2009 . - pp. 537–547. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 6 (Juin 2009) . - pp. 537–547 Mots-clés : Permeability;  Microcracking;  Durability;  High-performance  oncrete;  Fiber  reinforcement Résumé : The relationship between load-induced cracking and concrete permeability is studied. Ordinary concrete (OC) and high-performance concrete (HPC), including steel fiber-reinforced concrete (HPFRC), are used. Two discs, 50 mm-thick slices, cut from 110–220 mm cylindrical specimens are diametrically loaded, as for a normal splitting test. The lateral displacement, also called the crack opening displacement (COD) is monitored for each loading cycle. After unloading, gas and finally water permeability tests are both performed, using constant head permeameter, to compare the influence of the percolating fluid and the COD. Due to the wide range of measured gas flow, Klinkenberg's and Dupuit-Forcheimer's laws are applied to compute the intrinsic gas permeability. Results suggest it increases proportionally to the cube of the COD and it matches water permeability, if only the first water percolating time is considered. The roughness parameter of the cracks induced in each concrete, is compared and discussed. REFERENCE : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000696