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Materials and Structures

, Volume 31, Issue 7, pp 494–498 | Cite as

Fresh concrete: A Herschel-Bulkley material

  • F. de Larrard
  • C. F. Ferraris
  • T. Sedran
Technical Reports

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.

Keywords

Rotation Speed Strain Gradient Fresh Concrete Plastic Viscosity Bingham Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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Copyright information

© RILEM 1998

Authors and Affiliations

  • F. de Larrard
    • 1
  • C. F. Ferraris
    • 2
  • T. Sedran
    • 3
  1. 1.Laboratoire Central des Ponts et Chaussées (LCPC)ParisFrance
  2. 2.NISTGaithersburg
  3. 3.LCPCParis

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