Parallel-plate Rheometer Calibration Using Oil and Computer Simulation

Ferraris, Chiara F.; Martys, Nicos; Muzzatti, N V.

doi:10.3151/jact.5.363

Cited by 19 publications

(13 citation statements)

References 10 publications

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“…Furthermore, they claimed that this gap boundary is independent of the length L of their cleated tools, since the obtained results were insensitive to their used cleat lengths of 0.6 mm and 1.3 mm. Similar investigations have been performed by Ferraris et al [20], who analysed the influence of zeroing and serration on the measurement of calibration oils. Using a parallel-plate system as well, they determined a gap correction of 2 · δ = 270 µm for serrated upper and lower plates with a structure depth L = 381 µm.…”

Section: Introductionsupporting

confidence: 60%

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Absolute Rheological Measurements of Model Suspensions: Influence and Correction of Wall Slip Prevention Measures

et al. 2020

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Since suspensions (e.g., in food, cement, or cosmetics industries) tend to show wall slip, the application of structured measuring surfaces in rheometers is widespread. Usually, for parallel-plate geometries, the tip-to-tip distance is used for calculation of absolute rheological values, which implies that there is no flow behind this distance. However, several studies show that this is not true. Therefore, the measuring gap needs to be corrected by adding the effective gap extension δ to the prescribed gap height H in order to obtain absolute rheological properties. In this paper, we determine the effective gap extension δ for different structures and fluids (Newtonian, shear thinning, and model suspensions that can be adjusted to the behavior of real fluids) and compare the corrected values to reference data. We observe that for Newtonian fluids a gap- and material-independent correction function can be derived for every measuring system, which is also applicable to suspensions, but not to shear thinning fluids. Since this relation appears to be mainly dependent on the characteristics of flow behaviour, we show that the calibration of structured measuring systems is possible with Newtonian fluids and then can be transferred to suspensions up to a certain particle content.

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Section: Introductionsupporting

confidence: 60%

“…The difference is surely a result of Nickerson et al investigating only two cleat lengths. Furthermore, Ferraris et al [20] used a trapezoidal-like structure with a depth of 0.38 mm, which is quite similar to the pyramids (system 1). They corrected their measurements in the range of .…”

mentioning

confidence: 99%

Absolute Rheological Measurements of Model Suspensions: Influence and Correction of Wall Slip Prevention Measures

et al. 2020

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“…24 Another attempt to use oil for calibration of mortar rheometers was described by Ferraris and colleagues. 26 The approach relies on a combination of models and measurements leading to correction factors for the mortar rheometers. This approach is not easy to scale up to a concrete rheometer since various gaps are necessary to validate the correction factor.…”

Section: Reference Materialsmentioning

confidence: 99%

Concrete rheometers

Ferraris

Martys

2012

Understanding the Rheology of Concrete

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“…This yield stress can be estimated from the shear stress and shear rate in several ways. The most common method used for cement-based materials is the curve fitting the shear stress-shear rate curve with the Bingham test equation [9,10,11].…”

Section: Rheological Parametersmentioning

confidence: 99%

Re-Certification of SRM 2492: Bingham Paste Mixture for Rheological Measurements

Ferraris¹,

Olivas²,

Guthrie³

et al. 2015

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Rheological measurements are often performed using a rotational rheometer. In this type of rheometer, the tested fluid is sheared between two surfaces, one of which is rotating [1]. Usually, an angular velocity is imposed on the fluid (through the rotating surface) and this angular velocity determines the shear rate the fluid is subjected to. The response of the material is monitored by the measurement of the resultant torque on the shaft of the rheometer; this torque can then be converted to shear stress. In order to calibrate a rheometer, a standard oil of known viscosity should be tested in the rheometer to verify that the instrument is operating correctly. However, these standard oils are expensive; which makes it impractical for use in calibrating with the rheometer with a large capacity as needed for concrete. Additional, these standard oils that are not suspensions (i.e. they do not have solid particles suspended in the media), and thus using them may not capture some issues that may occur in a suspension rheology. Therefore, a relatively inexpensive, reference material is needed that incorporates aggregates for concrete rheometers. As concrete and mortar are non-Newtonian, the reference material should also be non-Newtonian. This report follows the development and serves as re-certification of a Standard Reference Material (SRM) for cement paste [2]. A multiscale approach will be utilized to develop SRMs for mortar and concrete in the future. The SRM 2492 will be the matrix fluid for a mortar SRM that will in turn become the matrix fluid for a concrete SRM. The report SP 260-174 Rev.2012 [2] describes how this SRM 2492, a "Bingham Paste Mixture for Rheological Measurements" was developed and provides all the details on the various ingredients. After an inter-laboratory study under the sponsorship of the American Concrete Institute (ACI) committee 238, Workability of Fresh Concrete, it was found that the instructions provided to prepare the SRM were inadequate to obtain reproducible data in all laboratories. Thus after establishing a better preparation method, new instructions were drafted and it was found that the certified values were no longer valid. Thus, it was necessary to redo a series of testing to obtain a new certified value. This report provides all measurements obtained, the calculation of the new rheological characteristics and the statistical analyses. This is report is the third edition of the report and is based on new data using a different method for preparing the mixture (see section 3.3

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Parallel-plate Rheometer Calibration Using Oil and Computer Simulation

Cited by 19 publications

References 10 publications

Absolute Rheological Measurements of Model Suspensions: Influence and Correction of Wall Slip Prevention Measures

Absolute Rheological Measurements of Model Suspensions: Influence and Correction of Wall Slip Prevention Measures

Concrete rheometers

Re-Certification of SRM 2492: Bingham Paste Mixture for Rheological Measurements

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