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]  inCement 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

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Extrudable reactive powder concretes / Pierre Mounanga in European journal of environmental and civil engineering, Vol. 16 Supplément N° 1 (Juin 2012)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 16 Supplément N° 1 (Juin 2012) . - pp. s99-s114 Titre : Extrudable reactive powder concretes : Hydration, shrinkage and transfer properties Type de document : texte imprimé Auteurs : Pierre Mounanga, Auteur ; Khalid Cherkaoui, Auteur ; Abdelhafid Khelidj, Auteur Année de publication : 2012 Article en page(s) : pp. s99-s114 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Reactive powder concrete Extrusion Hydration Shrinkage Durability Résumé : The behaviour of five reactive powder concretes (RPC), with four of them being extrudable, has been studied from the first minutes up to more than 90 days. The extrusion force, hydration rate, free autogenous shrinkage at early age, mechanical properties and durability parameters were measured. The performance analysis showed the benefits of a partial substitution of silica fume with crushed quartz on the RPC properties. The cost/performances analysis highlighted that the main advantage of using RPC lies in their potential of durability, which is 10 to 100 times higher than that of ordinary or high-performance concretes, according to the property considered. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.681961 [article] Extrudable reactive powder concretes : Hydration, shrinkage and transfer properties [texte imprimé] / Pierre Mounanga, Auteur ; Khalid Cherkaoui, Auteur ; Abdelhafid Khelidj, Auteur . - 2012 . - pp. s99-s114. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 Supplément N° 1 (Juin 2012) . - pp. s99-s114 Mots-clés : Reactive powder concrete Extrusion Hydration Shrinkage Durability Résumé : The behaviour of five reactive powder concretes (RPC), with four of them being extrudable, has been studied from the first minutes up to more than 90 days. The extrusion force, hydration rate, free autogenous shrinkage at early age, mechanical properties and durability parameters were measured. The performance analysis showed the benefits of a partial substitution of silica fume with crushed quartz on the RPC properties. The cost/performances analysis highlighted that the main advantage of using RPC lies in their potential of durability, which is 10 to 100 times higher than that of ordinary or high-performance concretes, according to the property considered. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.681961

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