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Fresh concrete: A Herschel-Bulkley material

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Abstract

Some preliminary results of an experimental program on the rheological behavior of fresh concrete are presented. In the rheological tests, performed with a plane-to-plane rheometer, it appears tha the relationship between torque and rotation speed is not exactly linear. The fresh concrete behavior is better described by the Herschel-Bulkley model:\(\tau = \tau \prime _0 + a \dot \gamma ^b \); τ and\(\dot \gamma \) are the shear stress and the strain gradient applied to the specimen, respectively. τ′0,a andb are three material parameters describing the concrete behavior. Among other advantages, this new description avoids the problem of negative yield stress encountered with the Bingham model.

Résumé

Quelques résultats préliminaires d'un programme expérimental de grande envergure, traitant de la rhéologie du béton frais, sont présentés. Les caractéristiques rhéologiques des mélanges sont mesurées avec le rhéomètre BTRHEOM. Il apparaît que la relation entre couple et vitesse de rotation n'est pas strictement linéaire; une description plus fine est fournie par le modèle de Herschel-Bulkley, de la forme\(\tau = \tau \prime _0 + a \dot \gamma ^b \); τ est la contrainte de cisaillement, et\(\dot \gamma \) le gradient de vitesse imposé à l'échantillon. Les paramètres τ′0, a and b décrivent le comportement du béton. Entre autres avantages, cette nouvelle approche permet d'éviter le problème des seuils négatifs, recontré avec le modèle de Bingham.

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Authors and Affiliations

  1. Laboratoire Central des Ponts et Chaussées (LCPC), Paris, France

    F. de Larrard

  2. NIST, Gaithersburg

    C. F. Ferraris

  3. LCPC, Paris

    T. Sedran

Authors
  1. F. de Larrard
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  2. C. F. Ferraris
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  3. T. Sedran
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Additional information

Editorial Note F. de Larrard and T. Sedran work at Laboratoire Central des Ponts et Chaussées (LCPC), France, a RILEM Titular Member. Dr. de Larrard is a RILEM Senior Member and a member of the Technical Advisory Committee (TAC). He participates in the work of TCs 145-WSM (Workability of Special Concrete Mixes), 158-AHC (The role of Admixtures in High Performance Concrete) and 174-SCC (Self Compacting Concrete). He was awarded the Robert L'Hermite Medal for excellence in research in 1989. C. F. Ferraris works at the National Institute of Standards and Technology (NIST), USA, a RILEM Titular Member. Dr. Ferraris is a RILEM Senior Member and a corresponding member of TC 158-AHC.

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de Larrard, F., Ferraris, C.F. & Sedran, T. Fresh concrete: A Herschel-Bulkley material. Mat. Struct. 31, 494–498 (1998). https://doi.org/10.1007/BF02480474

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  • DOI: https://doi.org/10.1007/BF02480474

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