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Patrice Estelle, Christophe Lanos
High torque vane rheometer for concrete: principle and validation from rheological measurements

Appl. Rheol. 22:1 (2012) 12881 (7 pages)

A high torque vane rheometer is used to measure the yields stress of cement-based materials. It is shown that this apparatus is suitable for the evaluation of the yield stress of various concretes and mortars in the fresh state in comparison with slump tests realized with ASTM Abrams cone. Then, the rheological properties (yield stress and shear flow behaviour) of a homogeneous kaolin clay suspension are studied with the apparatus and favourably compared with other rheometers and geometries.

Cite this publication as follows:
Estelle P, Lanos C: High torque vane rheometer for concrete: principle and validation from rheological measurements, Appl. Rheol. 22 (2012) 12881.

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.

Patrice Estelle, Christophe Lanos, Arnaud Perrot, Sofiane Amziane
Processing the vane shear flow data from Couette analogy

Appl. Rheol. 18:3 (2008) 34037 (6 pages)

A new procedure is described to convert the vane torque and rotational velocity data into shear stress vs shear rate relationships. The basis of the procedure consists in considering locally the sheared material as a Bingham fluid and computing a characteristic shear rate from Couette analogy. The approach is first applied to experimental vane data of Newtonian fluid, then used to process vane experimental data of non-Newtonian and yield stress materials. Results, which are favourably compared with torsional flow, show that the approach correctly predicts the rheological behaviour of the materials investigated.

Cite this publication as follows:
Estelle P, Lanos C, Perrot A, Amziane S: Processing the vane shear flow data from Couette analogy, Appl. Rheol. 18 (2008) 34037.


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