Rheological models for predicting plastic viscosity and yield stress of fresh concrete

Mahmoodzadeh, Fathollah; Chidiac, S.E.

doi:10.1016/j.cemconres.2013.03.004

Cited by 72 publications

(26 citation statements)

References 35 publications

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“…(9). The size of particles should be considered when estimating (Mahmoodzadeh and Chidiac 2013), so the approach has been adopted in this formula,where is instrinsic viscosity, y is a function of concentration , is the maximum packing density.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Pipe flow of pumping wet shotcrete based on lubrication layer

et al. 2016

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Wet shotcrete can reduce dust and improve supporting strength, however, safe and efficient pipage is a key technical part of wet shotcrete process. The paper studied the pipe flow law of wet shotcrete based on lubrication layer by build the experimental pumping circuit of wet shotcrete that can carry out a number of full-scale pumping tests. The experimental results show there was a linear relationship between pressure loss and flow rate. Combined with the Buckingham rheological equation, the computing equations of the yield shear stress and plastic viscosity were deduced through linear regression. A simple analytical method allowing for a rough estimation of the pumping pressure was proposed and used when considering the lubrication layer of wet shotcrete in pipes. In addition, two kinds of particulate distributive models were established along the time axial to analyze the formation of lubrication layer which is related with particles migration. By computational fluid dynamics simulation, the lubrication layer thickness of different mix proportions was estimated. A new method for measuring the thickness of lubrication layer was proposed to verify it by binarization processing. Finally, according to the comparative analysis of experiments, simulation and computed value, it can be seen that the lubrication layer plays a key role in the process of wet shotcrete flow and with the increase of lubrication layer thickness pipe pressure declines gradually.

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Section: Experimental Results and Analysismentioning

confidence: 99%

Pipe flow of pumping wet shotcrete based on lubrication layer

et al. 2016

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“…In summary, the instability caused by vibration is a critical issue in fresh concrete, and it is necessary to present a convenient and visual methodology to reveal the problem of CA settlement in vibrated concrete. In recent years, the theoretical models of rheological properties of cement-based materials have been extensively studied [32][33][34][35][36][37]. However, these developments have not been applied on the evaluation of CA settlement, and most knowledge is still based on experimental observations described above.…”

Section: Introductionmentioning

confidence: 99%

An experimental and numerical investigation of coarse aggregate settlement in fresh concrete under vibration

Cai¹,

Liu²,

Yu³

et al. 2021

Cement and Concrete Composites

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“…The constitutive models aiming at structural-scale applications consider concrete as a homogeneous non-Newtonian fluid, whose rheological properties are derived from the mix composition, e.g. [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Computational homogenization of fresh concrete flow around reinforcing bars

Kolařík

Patzák

Zeman

2018

Computers & Structures

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Motivated by casting of fresh concrete in reinforced concrete structures, we introduce a numerical model of a steady-state non-Newtonian fluid flow through a porous domain. Our approach combines homogenization techniques to represent the reinforced domain by the Darcy law with an interfacial coupling of the Stokes and Darcy flows through the Beavers-Joseph-Saffman conditions. The ensuing two-scale problem is solved by the Finite Element Method with consistent linearization and the results obtained from the homogenization approach are verified against fully resolved direct numerical simulations.

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Rheological models for predicting plastic viscosity and yield stress of fresh concrete

Cited by 72 publications

References 35 publications

Pipe flow of pumping wet shotcrete based on lubrication layer

Pipe flow of pumping wet shotcrete based on lubrication layer

An experimental and numerical investigation of coarse aggregate settlement in fresh concrete under vibration

Computational homogenization of fresh concrete flow around reinforcing bars

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