Abstract

La formulation d'un beton autoplacant (BAP) est une operation complexe qui necessite de trouver une bonne combinaison de materiaux compatibles et le dosage convenable de chacun de ses constituants afin d'obtenir une formulation repondant aux proprietes des BAP (fluidite et homogeneite). De multiples approches se sont developpees a travers le monde pour la formulation d'un beton autoplacant. La plupart des methodes de formulation sont concues actuellement de maniere empirique. Ces methodes se basent essentiellement sur des approches diphasiques du beton autoplacant. Elles sont divisees en deux categories : celles qui sont axees sur l'optimisation du volume de pate (sous forme de pate pure ou de mortier) et celles qui sont focalisees sur l'optimisation du squelette granulaire. Notre contribution est d'apprehender la problematique de la formulation des BAP de facon globale en integrant a la fois l'optimisation du volume de pate par l'ajout de filler calcaire avec trois dosages et l'optimisation du squelette granulaire par la methode graphique de Dreux - Gorisse. Les resultats obtenus montrent qu'il existe un volume de pate optimum et que la composition du squelette granulaire par la methode graphique de Dreux - Gorisse est applicable par le choix des fractions granulaires et leurs analyses granulometriques qui permet de mettre en evidence les classes manquantes Mots Cles : BAP - Optimisation - Granulats -Additions - Caracterisation The mix design of a self-compacting concrete (SCC) is a complex operation that requires finding a good combination of compatible materials, and the proper dosage of each of these components in order to obtain a formulation that meets the properties of SCC(fluidity and homogeneity). Multiple approaches have been developed in the world wide for the formulation of a self-compacting concrete. Most methods of formulation are currently designed empirically. These methods are mainly based on the fact that the BAP is a two-phase material. These methods are divided into two categories: those that focus on optimizing the volume of paste (paste form pure or mortar) and those that focus on optimizing the granular skeleton. Our contribution is to apprehend the problem formulation sec in a comprehensive manner, integrating both the optimization of the paste volume by adding the limestone filler with three dosages and optimizing the skeleton by the graphical method Dreux - Gorisse. The results obtained show that to formulate a self-compacting concrete, there is an optimum paste volume. Whereas the composition of the granular skeleton by the graphical method of Dreux - Gorisse is applicable by the choice of granular fractions and particle size analysis which allows highlighting the missing classes Keywords : SCC - Formulation - Optimization -Aggregate -Additions - Characterization

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