Abstract
A factorial design was carried out to model the influence of key mixture parameters on properties affecting the performance of self-consolidating concrete (SCC). Such responses included slump flow and rheological parameters, filling capacity and V-funnel flow to assess restrained deformability, surface settlement to evaluate stability after casting, and compressive strength. Thirty two mixtures were prepared to derive the statistical models and nine others to evaluate their accuracy. The models are valid for a wide range of mixture proportioning. The paper presents the derived models that unable the identification of underlying primary factors and thier interactions that influence the modelled responses of interest for self-consolidating concrete. Such parameters can be useful to reduce the test protocol needed for the proportioning of self-consolidating concrete. The use-fulness of the models to better understand trade-offs between mixture parameters and compare the responses obtained from various test methods are highlighted.
Résumé
Pour la formulation du béton autoplaçant (BAP) plusieurs gâchées s'imposent, étant donné qu'il faut maîtriser tous les facteurs affectant les propriétés à l'état frais et durci du béton. Des modèles statistiques ont été générés à partir de la réalisation d'un plan d'expérience. Ces modèles identifient les paramètres importants de la formulation sur la performance du béton autoplaçant: la déformabilité caractérisée par l'essai de l'étalement, les paramètres rhéologiques, la capacité de remplissage, et l'entonnoir; la stabilité traduite par le test du tassement et la résistance à la compression. La modélisation a nécessité un total de 32 gâchées de béton. Neuf autres mélanges ont été ajoutés afin dè vérifier la validation des modèles établis. Ce papier présente les modèles générés qui traduisent l'effet des paramètres principaux ainsi que leur intéractions sur les réponses mesurées. L'utilité des modèles à établir une meilleure compréhension entre les paramètres des mélanges et de trouver des corrélations entre les différents test réalisés est discutée.
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Editorial Note Prof. Dr. K. H. Khayat works at the University of Sherbrooke, a RILEM Titular member. He participates to the work of RILEM TC 145-WSM (Workability of special concrete mixes) and of RILEM TC 174-SCC (Self-Compacting Concrete).
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Khayat, K.H., Ghezal, A. & Hadriche, M.S. Factorial design model for proportioning self-consolidating concrete. Mat. Struct. 32, 679–686 (1999). https://doi.org/10.1007/BF02481706
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DOI: https://doi.org/10.1007/BF02481706