Extension of the Reiner–Riwlin equation to determine modified Bingham parameters measured in coaxial cylinders rheometers

Feys, Dimitri; Wallevik, Jon Elvar; Yahia, Ammar; Khayat, Kamal H.; Wallevik, Ólafur H.

doi:10.1617/s11527-012-9902-6

Cited by 193 publications

(79 citation statements)

References 26 publications

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“…ReinerRiwlin), transforming best-fitting curve parameters (e.g. intercept with T-axis and slope) into rheological parameters (yield stress and viscosity), instead of a point-to-point transformation of T to shear stress and velocity to shear rate, are also used [44,47,[51][52][53]. For static yield stress measurements, one can simply calculate the stress as τ o = T / 2 π R i 2 L in coaxial cylinders, as only a very small portion of the sample is sheared.…”

Section: Transformation Equations 44mentioning

confidence: 99%

Measuring Rheological Properties of Cement Pastes: Most common Techniques, Procedures and Challenges

et al. 2017

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The science of rheology is increasingly used to describe the properties of fresh cement paste. Compared to standard workability tests, rheological properties allow for more fundamental investigation, more precise phenomenological description of flow properties and serve as input for numerical simulations. Standard commercially available rheometers are typically used to perform those measurements. However, the results of the measurement depend on the geometry, testing procedure and a number of potential artefacts. This technical letter describes the most common techniques and procedures used to assess the rheological properties of cement paste, as well as challenges during measurements and actions to counter these challenges.

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Section: Transformation Equations 44mentioning

confidence: 99%

Measuring Rheological Properties of Cement Pastes: Most common Techniques, Procedures and Challenges

et al. 2017

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“…Paint, slurries, pastes, and food substances like margarine, mayonnaise and ketchup are good examples of Bingham fluids [31]. However, more complicated yield stress fluid also exists, like the modified Bingham fluid [32,33] or the Herschel-Bulkley fluid [34]. Regardless of type, these materials are generally referred to as viscoplastic fluids [35].…”

Section: Definitionsmentioning

confidence: 99%

“…This transformation procedure is called the Reiner-Riwlin equation (not to be confused with Reiner-Rivlin equation, which is a constitutive equation [45]). Its derivation is for example available in [45,33,47], and it transforms a relationship between torque and rotational (or angular) velocity into a relationship between shear stress and shear rate. It does not provide a point-topoint transformation, but it expresses the obtained relationship in fundamental units (Pa and Pa s): Fig.…”

Section: Importance Of Transformation Equationsmentioning

confidence: 99%

“…Although the Bingham model is commonly used for cement-based materials, several authors have reported nonlinear rheological behavior of special cement-based materials [47,[51][52][53][54]33]. In most cases, the material showed shear-thickening behavior due to the high shear rates applied and/or a very low water content [52].…”

Section: Choice Of Rheological Modelmentioning

confidence: 99%

“…Logically, when n = 1 or c/ μ = 0, the Bingham model is obtained. Extended versions of the Reiner-Riwlin equation have been proposed to deal with such non-linear models [33,47].…”

Section: Choice Of Rheological Modelmentioning

confidence: 99%

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Avoiding inaccurate interpretations of rheological measurements for cement-based materials

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Prüfen der Pumpbarkeit von Beton – Vom Labor in die Praxis

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Für die Beurteilung der Pumpbarkeit von Frischbeton existieren bislang keine normativen Regelungen, in denen die Anforderungen an seine rheologischen Eigenschaften festgeschrieben sind. Zur Prüfung der Pumpbarkeit von Frischbeton – vor allem auf der Baustelle – ist die Etablierung einfacher, robuster und dennoch aussagekräftiger rheologischer Messtechniken von elementarer Bedeutung. Im vorliegenden Beitrag werden die neuen prüftechnischen Ansätze für eine zielsichere Optimierung des Pumpens von Frischbeton vorgestellt. Insbesondere wird die Funktionsweise des sog. Gleitrohr‐Rheometers (Sliding Pipe Rheometer, SLIPER) erläutert, mit dem Fördermengen, Druckverhältnisse und resultierende Bewegungszustände des Frischbetons in einer Betonförderleitung in guter Näherung quantitativ abgeschätzt werden können. Im Rahmen einer Parameterstudie werden die unter Verwendung von SLIPER erzielten Ergebnisse analysiert und mit denen eines stationären Betonviskosimeters verglichen. Es werden die ermittelten Zusammenhänge zwischen Rheologie und Pumpbarkeit sowohl von Normalbetonen als auch von Sonderbetonen (selbstverdichtender Beton (SVB) und hochduktiler Beton (SHCC)) dargestellt. Schließlich wird die Vorhersagefähigkeit des Pumpverhaltens von Beton auf der Basis der SLIPER‐Untersuchungen durch Messung des Pumpdruckes unter Baustellenbedingungen validiert. Testing pumpability of concrete – From laboratory into practice In assessing concrete pumpability, there are still no norms or regulations providing guidelines with regard of fresh concrete's rheological properties. For testing concrete pumpability, especially on the construction site, the establishment of simple, robust but reliable testing techniques is of great importance. The paper at hand gives an overview of the new approaches in estimating pumpability of fresh concrete. In particular, the idea and working principle of the so‐called Sliding Pipe Rheometer (SLIPER) are explained. Using SLIPER, pumping pressure vs. discharge rate relationships can be reliably estimated for various pipe lengths and diameters. A parameter study on the effect of concrete composition on its pumpability is also presented. The results obtained from the SLIPER tests are analysed and compared with those obtained during tests with a stationary concrete viscometer and testing using conventional, empirical tests. The correlations between the rheological properties according to the BINGHAM model and the pumpability of four various ordinary concretes and two high performance concretes (self‐compacting concrete (SCC) and strain‐hardening cement‐based composite (SHCC)) are investigated. Finally, based on the investigations the predictive capacity of the SLIPER in respect of concrete pumpability is validated by measuring the discharge pressure under field conditions.

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Extension of the Reiner–Riwlin equation to determine modified Bingham parameters measured in coaxial cylinders rheometers

Cited by 193 publications

References 26 publications

Measuring Rheological Properties of Cement Pastes: Most common Techniques, Procedures and Challenges

Measuring Rheological Properties of Cement Pastes: Most common Techniques, Procedures and Challenges

Avoiding inaccurate interpretations of rheological measurements for cement-based materials

Prüfen der Pumpbarkeit von Beton – Vom Labor in die Praxis

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