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Ram extrusion force for a frictional plastic material: model prediction and application to cement paste

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Abstract

We developed a model to predict the ram extrusion force of frictional plastic materials such as cement-based pastes. The extrusion of cement-based materials has already been studied, but the interaction between shaping force and paste behaviour still have to be understood. Our model is based on the plastic frictional behaviour of cement-based materials and integrates the physical mechanisms that govern material extrusion flow and extrusion force increase. When the process starts, a pressure gradient is created in the extruder due to wall friction of the paste that is submitted to plug flow. It induces a consolidation of the material. As a result, a large increase of extrusion force appears. A Coulomb law is used to model cement-based materials, which is considered as consolidating granular media. Such modelling is compared with experimental results. Tests were carried out on extrudible cement pastes. Modelling and experimental results are in good agreement.

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Authors and Affiliations

  1. LGCGM équipe matériaux, INSA de Rennes 20, avenue des buttes de Coesmes, 35043, Rennes, France

    Arnaud Perrot, Patrice Estellé & Yannick Melinge

  2. LGCGM équipe matériaux, IUT de Rennes 3, rue du Clos Courtel-BP 90422, 35704, Rennes, CEDEX 7, France

    Christophe Lanos

Authors
  1. Arnaud Perrot
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  2. Christophe Lanos
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  3. Patrice Estellé
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  4. Yannick Melinge
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Correspondence to Arnaud Perrot.

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Paper presented at the Annual European Rheology Conference, Grenoble, April 2005

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Perrot, A., Lanos, C., Estellé, P. et al. Ram extrusion force for a frictional plastic material: model prediction and application to cement paste. Rheol Acta 45, 457–467 (2006). https://doi.org/10.1007/s00397-005-0074-y

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  • DOI: https://doi.org/10.1007/s00397-005-0074-y

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