Rheology of concentrated suspensions

Chong, J. S.; Christiansen, E. B.; Baer, A. D.

doi:10.1002/app.1971.070150818

Cited by 641 publications

(388 citation statements)

References 17 publications

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“…There have been various studies to illustrate the behavior of suspensions and suggested some viscosity models (Liu 2000;Krieger 1959;Chong and Baer 1971;Farris 1968). When taking into account the concrete, suggested viscosity models can be divided into two categories depending on the scale-level of constituents: unimodal suspension model and multimodal suspension model.…”

Section: Effects Of Particle Concentration and Particle Shape On Rheomentioning

confidence: 99%

“…The last model was provided by Chong and Baer (1971) predicting the relative viscosity as a function of particle volume fraction and maximum packing fraction, which is defined as following:…”

Section: Effects Of Particle Concentration and Particle Shape On Rheomentioning

confidence: 99%

“…Various rheological models (Hafid et al 2010;Chateau and Trung 2008;Liu 2000;Krieger 1959;Chong and Baer 1971;Farris 1968) were suggested to describe the rheological behavior of suspension. However, very few studies have been performed to establish comprehensive prediction methodology for concrete pumping, that is, there have been few studies investigating the role of these rheological models on determining the pipe flow of pumped concrete, more specifically, for the formation and material properties of lubrication layer.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Concrete Pumping Using Various Rheological Models

Choi

Kim

2014

Int J Concr Struct Mater

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When concrete is being transported through a pipe, the lubrication layer is formed at the interface between concrete and the pipe wall and is the major factor facilitating concrete pumping. A possible mechanism that illustrates to the formation of the layer is the shear-induced particle migration and determining the rheological parameters is a paramount factor to simulate the concrete flow in pipe. In this study, numerical simulations considering various rheological models in the shear-induced particle migration were conducted and compared with 170 m full-scale pumping tests. It was found that the multimodal viscosity model representing concrete as a three-phase suspension consisting of cement paste, sand and gravel can accurately simulate the lubrication layer. Moreover, considering the particle shape effects of concrete constituents with increased intrinsic viscosity can more exactly predict the pipe flow of pumped concrete.

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Section: Effects Of Particle Concentration and Particle Shape On Rheomentioning

confidence: 99%

Section: Effects Of Particle Concentration and Particle Shape On Rheomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction of Concrete Pumping Using Various Rheological Models

Choi

Kim

2014

Int J Concr Struct Mater

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“…Among these factors, the dependence of suspension viscosity on the particle concentration is of great interest in the sediment field [2,3,19,20]. Experiments have been performed to study this relationship, and some models have been used to describe it [21][22][23][24][25][26]. However, a simple relationship may not exist because the particle in a suspending medium can Water 2017, 9, 474 2 of 14 be subject to hydrodynamic, Brownian, colloidal force and other effects, which are not easily modelled in a simple form [16,[27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Dependence of Sediment Suspension Viscosity on Solid Concentration: A Simple General Equation

Zhu

Wang

Peng

2017

Water

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Abstract:In this study, a simple and new parametric equation is proposed that describes the relative viscosity of a suspension as a function of suspended solid concentration, covering a range from very dilute to highly concentrated states, based on Costa (2005). The proposed viscosity law depends mainly on the solid volumetric concentration φ and maximum packing fraction φ m at which a regime transition occurs. Furthermore, the viscosity of dilute as well as a highly-concentrated kaolinite suspension (in excess of 40% and lower than 50%) was measured in a coaxial cylinder rheometer. The proposed formula shows a capability of fitting the measured bulk viscosity into the hyper-concentrated regime in the experiment. Finally, the proposed equation could also be found to show a good fitting relationship with published experimental results on partially crystallised Li 2 Si 2 O 5 melt and partially melted granite with solid contents from 75% to 95%.

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“…where η susp and η cont are the viscosities of the suspension system and that of the continuous phase, respectively; c is a constant; φ ∞ is usually between 60 % and 74 % related to close packing of the NaCl particles [18]. When φ v,disp is close to φ ∞ , η susp increases sharply and leads to very poor flowability of the mixture.…”

Section: Development Of the Sc/vv/pl Methodsmentioning

confidence: 99%

Fabrication of poly(lactic acid) scaffolds by a modified solvent casting/porogen leaching method

et al. 2010

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Abstract:A modified solvent casting/particulate leaching (SC/PL) method was developed to fabricate thick three-dimensional poly(lactic acid) (PLA) scaffolds with controlled pore size and porosity, and much shorter processing time. The pasty mixture of PLA/CHCl 3 /NaCl was sealed in a Buchner funnel by a piston with a suction flask connected. A vacuum pump was used to facilitate the volatilization of solvent. The scaffolds were obtained by subsequent removal of NaCl in deionized water. The pore size within the scaffold was in good accordance with the particle size of NaCl (< 210, 210~310, 310~420 and 420~500 μm), all of which had more than 89 % of porosity, 1.95 ± 0.2 MPa of compressive modulus and non-cytotoxic to L929 cells. To demonstrate the applicability of the SC/VV/PL method, thick cylindrical and tubular porous scaffolds have been produced in this study. Compared with the traditional SC/PL without vacuum volatilization, the modified method, namely, solvent casting/vacuum volatilization/particulate leaching (SC/VV/PL) method, provide a more efficient way to fabricate thick scaffolds.

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Rheology of concentrated suspensions

Cited by 641 publications

References 17 publications

Prediction of Concrete Pumping Using Various Rheological Models

Prediction of Concrete Pumping Using Various Rheological Models

Dependence of Sediment Suspension Viscosity on Solid Concentration: A Simple General Equation

Fabrication of poly(lactic acid) scaffolds by a modified solvent casting/porogen leaching method

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