Journal Article10.1122/1.1879041
“Fifty-cent rheometer” for yield stress measurements: From slump to spreading flow
Nicolas Roussel,Philippe Coussot +1 more
474
TL;DR: In this article, the authors extend the theoretical analysis of the slump test by including different flow regimes according to the ratio between the radius (R) and the height (H) of the slumped cone.
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Abstract: The slump test, originally used to determine the “workability” of fresh concrete, has since been used in many industrial fields (e.g., mining and food industries). It offers a quick and easy way to measure the yield stress of suspensions or pasty materials. The model used for estimating the yield stress from the measured conical slump was first written by Murata [Mater. Struct. 98, 117–129 (1984)], corrected by Schowalter and Christensen [J. Rheol., 42, 865–870 (1988)] and adapted for a cylindrical geometry by Pashias [J. Rheol. 40, 1179–1189 (1996)]. However, a discrepancy between experimental and predicted slumps still appears in the case of conical slumps [Clayton et al., Int. J. Miner. Process. 70, 3–21 (2003)] and for high-yield stress materials. In the present paper, we extend the theoretical analysis of this simple practical test by including different flow regimes according to the ratio between the radius (R) and the height (H) of the slumped cone. We propose analytical solutions of the flow for t...
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Citations
Extension of the Reiner–Riwlin equation to determine modified Bingham parameters measured in coaxial cylinders rheometers
Dimitri Feys,Jon Elvar Wallevik,Ammar Yahia,Kamal H. Khayat,Kamal H. Khayat,Olafur H. Wallevik,Olafur H. Wallevik +6 more
TL;DR: In this paper, the Reiner-Riwlin transformation equation for coaxial cylinders rheometers is developed for the modified Bingham model, which is an extension of the Bingham Model with a second order term in the shear rate, and its validation is further proven by means of numerical simulations applied on experimental data.
222
Distinguishing dynamic and static yield stress of fresh cement mortars through thixotropy
Ye Qian,Shiho Kawashima +1 more
TL;DR: In this article, the dynamic and static yield stress of fresh cement mortar were measured in a rotational rheometer with a vane geometry using shear rate and shear stress-controlled protocols, respectively.
Rheology of fresh concrete: from measurements to predictions of casting processes
TL;DR: In this article, the authors make a link between the measurements of the rheological properties of fresh concrete (yield stress and thixotropy) and casting processes and make use of them for the prediction of formwork filling, pressure formwork or multilayer casting occurrence.
213
Yield stress criteria to assess the buildability of 3D concrete printing
TL;DR: In this article, the Mohr-Coulomb-based buildability criterion was developed and validated with laboratory experiments and numerical simulations to identify the buildability criteria based on the green strength of concrete and the effect of early age material properties on the stability of printed structures.
195
A Physical Model for the Prediction of Lateral Stress Exerted by Self-Compacting Concrete on Formwork
TL;DR: In this paper, a model is proposed to describe the evolutions of the lateral stress exerted by self compacting concrete (SCC) on a formwork during and after casting.
185
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