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Prediction of the ram extrusion force of cement-based materials
Appl. Rheol. 24:5 (2014) 53320 (7 pages) ►
The aim of this study is to propose a theoretical frame that is able to lead someone to an appropriate way of modeling cement-based material extrusion. It clearly appears that different extrusion scenarios may occur. Cement-based materials are viscoplastic materials that may undergo drainage during an extrusion process carried out at low velocity. Four material behaviors can be encountered: perfect plastic, viscoplastic, frictional plastic (with evolving properties) and frictional viscoplastic (that has never been reported in the literature as drainage occurs when ram velocity is low and thus when viscous effects can be neglected). In this work, criteria are proposed to choose the more relevant way to model extrusion. Then, models are proposed for the possible extrusion scenarios.► Cite this publication as follows:
Perrot A, Rangeard D, Melinge Y: Prediction of the ram extrusion force of cement-based materials, Appl. Rheol. 24 (2014) 53320.
Arnaud Perrot, Yannick Melenge, Patrice Estelle, Damien Rangeard, Christophe Lanos
The back extrusion test as a technique for determining the rheological and tribological behaviour of yield stress fluids at low shear rates
Appl. Rheol. 21:5 (2011) 53642 (10 pages) ►
A new method is developed to determine the rheological and tribological behaviour of viscoplastic fluids using a back extrusion test. In back extrusion geometry, the material is forced to flow in the gap between the inner and the outer cylinder. Such a flow is modelled by a Bingham constitutive law under different wall boundary conditions (stick, slip with friction and perfect slip). When steady-state flow is reached, an apparent shear rate is computed. The analysis of the inner cylinder penetration force versus the penetration depth helps us to develop a method to identify the fluid rheological and tribological properties. This method is based on an inverse analysis to identify the fluid behaviour parameters from experiments performed at different ram velocities and with different apparatus geometries. In order to study more complex fluids (Herschell-bulkley rheological behaviour, for example), an equivalent flow curve is plotted from tests characterized by different average shear rates. The tribological behaviour is identified using different wall boundary conditions, varying the surface roughness of the cylinders. The method is applied to oil/sugar suspension and plasticine. Rheological and tribological behaviours are identified and results are compared with those obtained under steady state shear flow. The obtained rheological parameters are close to those provided by the common rheological methods (difference lower than 15 %).► Cite this publication as follows:
Perrot A, Melinge Y, Estelle, Rangeard D, Lanos C: The back extrusion test as a technique for determining the rheological and tribological behaviour of yield stress fluids at low shear rates, Appl. Rheol. 21 (2011) 53642.
Arnaud Perrot, Damien Rangeard, Yannick Melinge, Patrice Estelle, Christophe Lanos
Extrusion criterion for firm cement-based materials
Appl. Rheol. 19:5 (2009) 53042 (7 pages) ►
The stability of the flow induced by the extrusion forming process of a cement based material is largely influenced by the relative migration between the lubricating liquid phase and the granular skeleton. In the present work,we propose linking rheological concepts and soil mechanics (consolidation theory, Darcy's law) to reach a simple criterion which predicts the extrusion ability of a mortar. Extrusion tests on studied mortar are performed at different ram velocities for criterion validation.► Cite this publication as follows:
Perrot A, Rangeard D, Melinge Y, Estelle P, Lanos C: Extrusion criterion for firm cement-based materials, Appl. Rheol. 19 (2009) 53042.
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