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Author index ►Nicolas Roussel, Hela Bessaies-Bey, Philippe Coussot

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The 1st International RILEM Symposium on Rheology and Processing of Construction Materials

Appl. Rheol.24:1 (2014) 46-47 ►

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Roussel N, Bessaies-Bey H, Coussot P: The 1st International RILEM Symposium on Rheology and Processing of Construction Materials, Appl. Rheol. 24 (2014) 46.

We discuss the possibility of using penetrometry technique for measuring the yield stress of concentrations made of grains immersed in a colloidal phase, such as concrete or muds. In that aim we used model materials made by suspending glass beads at different concentrations in a kaolin-water paste. We then show that a uniform shear stress develops along the object (plate or cylinder) beyond the entrance length. This shear stress plotted versus the object velocity exhibits a shape similar to the flow curve of the material determined from rheometry. For materials exhibiting the typical flow curve of a simple yield stress fluid, i.e. at bead concentrations smaller than 30 %, the stress associated with an inflection point located at low velocities of this curve appears to correspond to the material yield stress. At larger concentrations of beads the suspensions have a more complex behaviour likely affected by its granular nature at a local scale and the possibility of migration or frictional effects, so that neither conventional rheometry nor penetrometry provide relevant data. We conclude by describing two practical penetrometry techniques for precisely measuring the yield stress of simple pastes.► Cite this publication as follows:

Tikmani M, Boujlel J, Coussot P: Assessment of penetrometry technique for measuring the yield stress of muds and granular pastes, Appl. Rheol. 23 (2013) 34401.

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Coussot P, Kissi NE, Tassin J-F: De Gennes Discussion Conference 2009, a brief survey, Appl. Rheol. 19 (2009) 250.

We show that the rheological characteristics of a fresh cement paste can be determined from inclined plane tests.The apparent flow curve measured from inclined plane flows coincides with the apparent rheogram from classical rheometer tests and the flow curve obtained from local Couette flow measurements with magnetic resonance imaging (MRI). In order to describe the thixotropic properties of these fluids we suggest to use a simple model, the four parameters of which may be determined from specific, practical, inclined plane experiments.► Cite this publication as follows:

Jarny S, Roussel N, LeRoy R, Coussot P: Thixotropic behavior of fresh cement pastes from inclined plane flow measurements, Appl. Rheol. 18 (2008) 14251.

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Coussot P, Barrat J: Flow in Glassy Systems. European School of Rheology, Appl. Rheol. 17 (2007) 228.

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Rheological Societies, Mielke W, Coussot P, Mavrantzas VG, Wagner MH, Zatloukal M: Society's Site Sep 2005 - Feb 2006, Appl. Rheol. 15 (2005) 252.

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Rheological Societies, Petrie CJS, Mielke W, Coussot P, Kissi NE, Fischer P, Mavrantzas VG, Grizzuti N, Jarvela P, Wanger MH: Society's Site Mar 2005 - Aug 2005 , Appl. Rheol. 15 (2005) 59.

We examine the validity of the slump test for predicting the yield stress of polymeric suspensions and mineral suspensions. First we propose a modification of this test: in order to make measurements on fluids with high yield stress (of the order of several hundreds of Pascal) we add a mass at the sample top. From detailed observations of the slump in time we show that, for polymeric suspensions (hair gel and sewage sludges), two critical stresses can be distinguished which almost exactly correspond to the two critical stresses (respectively corresponding to a regime change and to the asymptotic slump) observed in rheometry during creep tests. Thus the slump test appears as a practiceful and relevant means to determine the intrinsic properties of these fluids. For mineral suspensions it is shown that the flow abruptly stops after a short time, a behaviour in agreement with the results of rheometrical tests carried out by progressively decreasing the applied stress. In that case the slump also appears to significantly depend on the procedure and cannot be related to a single property of the material.► Cite this publication as follows:

Baudez J-C, Chabot F, Coussot P: Rheological Interpretation of the Slump test, Appl. Rheol. 12 (2002) 133.

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