Materials and Structures

, Volume 38, Issue 1, pp 17–24 | Cite as

Characterization of rheology of fresh fiber reinforced cementitious composites through ram extrusion

  • X. Zhou
  • Z. Li
Scientific Reports
Received:
Accepted:

Abstract

Rheology behavior of fresh short fiber reinforced cementitious composites was investigated through ram extrusion. The experimental results were interpreted by a six-parameter Benbow-Bridgwater model. The effects of water contents, matrix composition, fiber volume and fiber types on the die entry and die land pressure were investigated and related to the compositions of the fresh short fiber reinforced cementitious composites. The six rheological parameters, together with the dynamic bulk stress and dynamic surface shear stress, were derived and compared for various composites. It was found that fresh short fiber reinforced cementitious composites had an obvious pseudo-plasticity and shear-thinning behavior. The water content, fiber concentration, fiber type and cement matrix influenced the rheology of the fresh composites in different mechanisms. The quantitative rheology parameters, such as bulk yield stress, dynamic bulk stress, wall shear yield stress and dynamic surface shear stress, provided promising interpretations for experimental results.

Keywords

Cement Matrix Extrusion Pressure Fiber Concentration Slag Powder Water Binder Ratio 
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

Le comportement rhéologique de composites cimentaires, frais, renforcés de fibres courtes a été identifié à l'aide d'une extrudeuse à piston. Les résultats expérimentaux sont interprétés en utilisant le modèle de Benbow-Bridgwater. L'influence du dosage en eau, de la composition du ciment, du type de fibres et de leur pourcentage sur le diamètre d'entrée de la filière ainsi que le champ de pression dans la filière est étudiée et reliée à la composition de ces composites cimentaires. Six paramètres rhéologiques dont les seuils de cisaillement, interne et aux interfaces, sont identifiés et comparés pour les différentes compositions. Les composites cimentaires, renforcés de fibres courtes, étudiés présentent une pseudo-plasticité et un comportement rhéofluidifiant. Le dosage en eau, le pourcentage de fibre ainsi que le type de fibre et la composition du ciment, influencent le comportement rhéologique de ces composites cimentaires de différentes manières. Les valeurs numériques obtenues pour les paramètres rhéologiques et tribologiques, tels que les seuils et les contraintes de cisaillement, internes et aux interfaces, sont très encourageantes et permettent de conclure sur la fiabilité de ces résultats expérimentaux.

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Copyright information

© RILEM 2004

Authors and Affiliations

  • X. Zhou
    • 1
  • Z. Li
    • 1
  1. 1.Department of Civil Engineeringthe Hong Kong University of Science and TechnologyHong Kongthe People's Republic of China

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