RILEM TC 266-MRP: round-robin rheological tests on high performance mortar and concrete with adapted rheology—rheometers, mixtures and procedures

Feys, Dimitri; Sonebi, Mohammed; Amziane, Sofiane; Djelal, Chafika; El-Cheikh, Khadija; Fataei, Shirin; Greim, Markus; Ivanova, Irina; Keller, Helena; Khayat, Kamal H.; Libessart, Laurent; Mechtcherine, Viktor; Navarrete, Iván; Perrot, Arnaud; Secrieru, Egor; Vanhove, Yannick

doi:10.1617/s11527-023-02173-1

Cited by 8 publications

(7 citation statements)

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“…The steady-state rheological behavior of cementitious materials corresponds to the rheological behavior of the materials at the unstructured state (i.e., the state of non-flocculated cement particles: assembly with no nucleation points). As shown in [41],…”

Section: Static and Dynamic Yield Stressmentioning

confidence: 92%

“…Five concrete mixtures and three mortar mixtures were evaluated in the round-robin testing campaign. The details of their mix-design are provided as well as the results of empirical tests [41].…”

Section: Materials and Devicesmentioning

confidence: 99%

“…The various devices employed during the round-robin testing campaign that were employed for the evaluation of the structural build-up at rest are described in [41]. Among all the devices of the round-robin tests, five different rheometers and the plate tests were used to describe the structural build-up rate.…”

Section: Materials and Devicesmentioning

confidence: 99%

“…The plate test consists of measuring the mass variation with time of a rough plate or cylinder suspended in a freshly mixed cement paste [59], mortar [35,[59][60][61] and even concrete [22]. The mass variation allows to compute the evolution of the static yield stress of cement-based materials with time using a simple force balance equation as explained in [41]. Such a test is similar to the moving plate test developed in NIST [62], to the Lombardi plate cohesion as used in [63] and to the inclined plate test even if this last test does not provide a continuous measurement of the static yield stress [64].…”

Section: Materials and Devicesmentioning

confidence: 99%

“…The average results were computed using values obtained with the different rheometers for the same mixture. The methodology of baseline value computation used in [41] has not been chosen here because of the lower numbers of data available for each mixture: in the present case, each rheometer have the same weight. Data were analysed using Athix derived from two static yield stress measurements carried out after 10 and 40 minutes (Figure 4a) and also from three measurements: two static yield stress measurements carried out after 10 and 40 minutes and the dynamic yield stress value at 0 min (Figure 4b).…”

Section: Static Yield Stressmentioning

confidence: 99%

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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

Amziane,

Khayat,

Sonebi

et al. 2023

Mater Struct

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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. Five 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, Viscomat XL and eBT-V rheometers, and 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 two static yield stress values measured after 10 and 40 minutes of rest as well as three static yield stress values that combine the two static yield stress measurements and the initial dynamic yield stresses 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 to determine more accurately the various thixotropy indices.

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Section: Static and Dynamic Yield Stressmentioning

confidence: 92%

Section: Materials and Devicesmentioning

confidence: 99%

Section: Materials and Devicesmentioning

confidence: 99%