Abstract
This paper presents the results of a round-robin testing program undertaken by RILEM TC-266-Measuring Rheological Properties of Cement-Based Materials in May 2018 at the Université d’Artois in Bethune, France. Seven types of rheometers were compared; they consisted of four ICAR rheometers, Viskomat XL rheometer, eBT-V rheometer, Sliding Pipe Rheometer (SLIPER), RheoCAD rheometer, and 4SCC rheometer, as well as the plate test. This paper discusses the results of the evolution of the static yield stress at rest of three mortar and five concrete mixtures that were determined using two ICAR rheometers, Viskomat XL, and eBT-V rheometers, as well as the plate test. For the measurements carried out with rheometers, three different structural build-up indices (i.e., structural build-up rate, critical time, and coupled effects of initial static yield stress and rate of structural build-up) were determined. The indices were established using: (i) two static yield stress values measured after 10 and 40 min of rest; and (ii) two static yield stress values measured after 10 and 40 min of rest plus the initial dynamic yield stress (no rest and obtained from the flow curves). The paper discusses the test results and highlights inaccuracies that could be encountered in determining the static yield stress. Test results indicate that the ICAR rheometers and the selected thixotropic indices can provide similar results, and that the spread of results obtained from different rheometers can be considerably reduced when using three yield stress values to calculate the rate of the static yield stress at rest. In order to enhance the accuracy of measurements, it is recommended to increase the number of measurements of the yield stress to at least three points over one hour after mixing.
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Acknowledgements
The authors recognize the help of the scientific and technical team at the Université d’Artois, LGCgE Laboratoire de Génie Civil et Géo-Environnement. The authors are grateful to Mr. Faber Fabbris from concrete producer EQIOM for planning and providing “just in time” mortar and concrete mixtures of different rheological properties. The authors are very thankful to all other participants in the round-robin testing compaign: Geert De Schutter, Chafika Djelal, Khadija El Cheikh, Faber Fabbris, Shirin Fataei, Dimitri Feys, Markus Greim, Irina Ivanova, Laurent Libessart, Helena Keller, Viktor Mechtcherine, Ivan Navarrete, Egor Secrieru, Yannick Vanhove and their organisations.
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This document is the result of an experimental campaign supported by and carried out by a task group of RILEM TC 266-MRP. Other members of the task group who contributed to the experimental campaign and data treatment are: DF, ES, HK, KE, YV, CD, SF, MG, II, LL, VM, and IN. Other members of RILEM TC 266-MRP, not involved in the task group are: RC, GDS, SF, SG, MH, SJ, KL, JL, DL, TP, NR, WS, JV, JEW, AY, and JZ. This paper was reviewed and approved by all members of the committee.
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RILEM TC 266-MRP: Chair: Mohammed Sonebi.
Deputy Chair: Dimitri Feys.
TC Members: Sofiane Amziane, Rolands Cepuritis, Chafika Djelal-Dantec, Khadija El Cheikh, Siamak Fakhryee Nejad, Shirin Fataei, Dimitri Feys, Markus Greim, Steffen Grünewald, Michael Haist, Irina Ivanova, Stefan Jacobsen, Helena Keller, Kamal Khayat, Karel Lesage, Laurent Libessart, Julian Link, Dirk Lowke, Viktor Mechtcherine, Ivan Navarrete, Arnaud Perrot, Tilo Proske, Nicolas Roussel, Wolfram Schmidt, Geert de Schutter, Egor Secrieru, Mohammed Sonebi, Yannick Vanhove, Jon E. Wallevik, Ammar Yahia, Jiang Zhu.
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Amziane, S., Khayat, K., Sonebi, M. et al. RILEM TC 266-MRP: Round-Robin rheological tests on high performance mortar and concrete with adapted rheology—evaluating structural build-up at rest of mortar and concrete. Mater Struct 56, 150 (2023). https://doi.org/10.1617/s11527-023-02236-3
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DOI: https://doi.org/10.1617/s11527-023-02236-3