Passing ability of fresh concrete: A probabilistic approach / N. Roussel in Cement and concrete research, Vol. 39 N° 3 (Mars 2009)  

Public ISBD [article]  inCement and concrete research > Vol. 39 N° 3 (Mars 2009) . - pp. 227–232 Titre : Passing ability of fresh concrete: A probabilistic approach Type de document : texte imprimé Auteurs : N. Roussel, Auteur ; T.L.H. Nguyen, Auteur ; O. Yazoghli, Auteur Année de publication : 2009 Article en page(s) : pp. 227–232 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Rheology  Casting  Aggregates  Blocking Résumé : In the present paper, it is first reminded that the probability of granular blocking of a suspension crossing a flow contraction increases with the number of particles crossing the obstacles, their volume fraction and the ratio between the diameter of the particles and the contraction gap. It is moreover reminded that this phenomenon can be described using a simple dimensionless geometric parameter as this phenomenon only slightly depends on the rheology of the suspending fluid. An adaptation of this dimensionless parameter to the specific case of concrete is proposed and compared to experimental results. Finally, an application to the prediction of the passing ability of Ordinary Rheology Concrete (ORC) and Self Compacting Concrete (SCC) is proposed and compared to the European technical recommendations. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884608002184 [article] Passing ability of fresh concrete: A probabilistic approach [texte imprimé] / N. Roussel, Auteur ; T.L.H. Nguyen, Auteur ; O. Yazoghli, Auteur . - 2009 . - pp. 227–232. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 3 (Mars 2009) . - pp. 227–232 Mots-clés : Rheology  Casting  Aggregates  Blocking Résumé : In the present paper, it is first reminded that the probability of granular blocking of a suspension crossing a flow contraction increases with the number of particles crossing the obstacles, their volume fraction and the ratio between the diameter of the particles and the contraction gap. It is moreover reminded that this phenomenon can be described using a simple dimensionless geometric parameter as this phenomenon only slightly depends on the rheology of the suspending fluid. An adaptation of this dimensionless parameter to the specific case of concrete is proposed and compared to experimental results. Finally, an application to the prediction of the passing ability of Ordinary Rheology Concrete (ORC) and Self Compacting Concrete (SCC) is proposed and compared to the European technical recommendations. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884608002184

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