Prediction on pipe flow of pumped concrete based on shear
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Prediction on pipe flow of pumped concrete based on shear .

Prediction on pipe flow of pumped concrete based on shear ...

2013-10-1  In the pipe flow of pumped concrete, the shear stress is the highest at the wall of the pipe and linearly decreases as the position moves to the center of the pipe. The stress gradient is a driving force to move particles toward the center of the pipe as described in

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Prediction on pipe flow of pumped concrete based on shear ...

Prediction on pipe flow of pumped concrete based on shear-induced particle migration Author links open overlay panel Myoung Sung Choi a b Young Jin Kim a Seung Hee Kwon c Show more

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Prediction on pipe flow of pumped concrete based on shear ...

Request PDF Prediction on pipe flow of pumped concrete based on shear-induced particle migration When concrete is being transported through a pipe, the lubrication layer is formed at the ...

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Prediction of Concrete Pumping Using Various Rheological ...

2014-7-8  In the pipe flow of pumped concrete, the shear stress is the highest at the wall of the pipe and linearly decreases as the position moves to the center of the pipe. The stress gradient is a driving force to move particles toward the center of the pipe as described in the first term of the right side in Eq. (1).

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Assessment and prediction of concrete flow and pumping ...

2020-3-1  Concrete flow in a pipeline is a complex material response to the induced pressure accompanied by shear in LL [ 18 ], friction between solid particles and pipe wall [ 10, 18, 19 ], and significant hydrodynamic interactions among particles within the partially sheared concrete bulk [

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(PDF) Prediction of Concrete Pumping Using Various ...

1. When concrete is being pumped, the lubrication layer. which is formed at the interface between the concrete. and the wall of the pipe plays a dominant role to. facilitate the concrete pumping ...

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Effect of the Mineral Admixtures on Pipe Flow of Pumped ...

high enough to make the concrete flow and the lubrica-tion layer is fully sheared were assumed. Fig. 1 illus-trated the schematic velocity profile in the pipe flow of pumped concrete and more detail information like deri-vation processes could be found in early paper (Choi et al. 2014). 12 0 44 3 3,0 44 3 3,0 22 2 [3 ( ) 8 ( ) 24 3( )8( )] p L ...

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Numerical Prediction on the Effects of the Coarse ...

(2012) tried to simulate the concrete flow inside the pipe considering the formation of lubrication layer. Choi et al. (2013a) developed the numerical prediction method based on the consideration of the particle shape effects on pumped concrete flow. However, Jo et al.’s work has some limitations in

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(PDF) State of the Art on Prediction of Concrete Pumping

2016-6-16  Second, based on the rheological properties of slip layer and parent concrete, models to predict concrete pumping (flow rate, pumping pressure, and pumpable distance) are explained.

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Effect of the coarse aggregate size on pipe flow of pumped ...

2014-9-15  The objective of this study is to find the influence of the coarse aggregate size on pipe flow of pumped concrete. Six different concrete mixes having two mixture proportions (24 and 50 MPa) and three maximum coarse aggregate sizes (10, 20 and 25 mm) were selected and pumped into 170 m and 1000 m pipelines at different pumping pressures.The rheological properties of the concrete and the ...

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Assessment and prediction of concrete flow and pumping ...

2020-3-1  Concrete flow in a pipeline is a complex material response to the induced pressure accompanied by shear in LL [], friction between solid particles and pipe wall [10,18,19], and significant hydrodynamic interactions among particles within the partially sheared concrete bulk [20,21]; cf. Fig. 2.The extent to which frictional resistance is active depends on the state of saturation of the concrete ...

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Vol.8, No.4, pp.269–278, December 2014 DOI

2017-8-26  In the pipe flow of pumped concrete, the shear stress is the highest at the wall of the pipe and linearly decreases as the position moves to the center of the pipe. The stress gradient is a driving force to move particles toward the center of the pipe as described in

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A first-order physical model for the prediction of shear ...

1. Introduction. Concrete is a visco-plastic material. As such, its pumping in a cylindrical pipe combines features from two standard fluid mechanics flow typologies, namely the benchmark Poiseuille flow for a Newtonian viscous fluid and the extrusion of a yield stress material [].This flow is macroscopically described by two external state parameters, the pressure gradient applied to the ...

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State of the Art on Prediction of Concrete Pumping ...

2016-6-16  Effect of the coarse aggregate size on pipe flow of pumped concrete. Construction and Building Materials, 66, 723–730. Article Google Scholar Choi, M. S., Kim, Y. J., Kwon, S. H. (2013a). Numerical prediction on pipe flow of pumped concrete based on shear-induced particle migration. Cement and Concrete Research, 52, 216–224.

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Effect of the Mineral Admixtures on Pipe Flow of Pumped ...

high enough to make the concrete flow and the lubrica-tion layer is fully sheared were assumed. Fig. 1 illus-trated the schematic velocity profile in the pipe flow of pumped concrete and more detail information like deri-vation processes could be found in early paper (Choi et al. 2014). 12 0 44 3 3,0 44 3 3,0 22 2 [3 ( ) 8 ( ) 24 3( )8( )] p L ...

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Effect of the coarse aggregate size on pipe flow of pumped ...

2014-9-15  The objective of this study is to find the influence of the coarse aggregate size on pipe flow of pumped concrete. Six different concrete mixes having two mixture proportions (24 and 50 MPa) and three maximum coarse aggregate sizes (10, 20 and 25 mm) were selected and pumped into 170 m and 1000 m pipelines at different pumping pressures.The rheological properties of the concrete and the ...

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Prediction of Concrete Pumping: Part II-Analytical ...

Request PDF Prediction of Concrete Pumping: Part II-Analytical Prediction and Experimental Verification The primary objective of this study is to verify if the rheological properties of the ...

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Numerical Prediction on the Effects of the Coarse ...

2017-7-11  Numerical Prediction on the Effects of the Coarse Aggregate Size to the Pipe Flow of Pumped Concrete Myoung Sung Choi 1) 2) 1) Civil Engineering Research Team, Daewoo Institute of Construction Technology, Suwon, Korea.

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Prediction of Concrete Pumping: Part I—Development of

2013-11-1  The American Concrete Institute. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete

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Pipe Flow Calculations - Clarkson University

2014-7-3  fully developed, incompressible, Newtonian flow through a straight circular pipe. Volumetric flow rate . 2 4 Q DV π = where D is the pipe diameter, and V is the average velocity. Reynolds Number: 44 Re DV DV Q m DD ρ µ ν πν π µ = = = = where . ρ is the density of the fluid, µ is its dynamic viscosity, and ν µρ= / is the kinematic ...

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Vol.8, No.4, pp.269–278, December 2014 DOI

2017-8-26  In the pipe flow of pumped concrete, the shear stress is the highest at the wall of the pipe and linearly decreases as the position moves to the center of the pipe. The stress gradient is a driving force to move particles toward the center of the pipe as described in

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A new method to estimate rheological properties of ...

the prediction of concrete pumping. In order to predict concrete pumping, it is important to first . understand the mechanism of the flow inside. the piping such as lubrication layer formation and . velocity distribution in the pipe and to analyze the material to be pumped. When concrete is . pumped, a lubricating layer forms between the pipe ...

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Estimation of the Pumping Pressure from Concrete ...

A new method is proposed to estimate pumping pressure based on concrete composition without experimental measurements. Previous studies show that the pumping pressure depends on the interface friction between concrete and the wall of the pumping pipes. This friction is determined by the thickness and the rheology of the boundary layer formed at the interface.

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Experimental Simulation of the Effect of Shear on ...

For experimental simulation of the shear process during pipelining, shear rates of turbulent pipe flow, and flow through centrifugal pumps and throttle valves are necessary. Stirred vessels are usually used for shear simulation in laboratory, therefore shear rate in the stirred vessels has to be known before shear

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Fluid Flow - NCSU

2017-2-16  • For pipe flow, –Max shear stress •4V/ R3OR 4u/R. 8. Shear Stress Shear Rate for Pipe Flow • Shear stress –Maximum at wall –Zero at center of pipe ... based on the velocity profile during pipe flow 22. Factors Affecting Type of Flow in a Pipe • What factors affect if flow in a pipe is going to be

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OPERATIONAL PROBLEMS IN PUMPING NON ... - Pipe

2020-7-1  compressible pipe flow, waterhammer, ... where the fluid shear stress is direshear ctly proportional to rate. The proportionality constant is the viscosity of the fluid. ... Based on the fact that the NPSH showed no problems in the analysis, the focus ...

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(PDF) Prediction of the lateral pressure exerted by self ...

The pressure values were estimated by comparing the force measured on the tie-bars with the area of the where ô0 is the yield shear stress, g is the gravity relevant form, i.e. (2 3 1784)/4, or in other words acceleration, r is the density of the material and S is 0892 m2 . the spread of the fresh concrete measured with the flow In both ...

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Pipe Flow Calculations - Clarkson University

2014-7-3  fully developed, incompressible, Newtonian flow through a straight circular pipe. Volumetric flow rate . 2 4 Q DV π = where D is the pipe diameter, and V is the average velocity. Reynolds Number: 44 Re DV DV Q m DD ρ µ ν πν π µ = = = = where . ρ is the density of the fluid, µ is its dynamic viscosity, and ν µρ= / is the kinematic ...

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Pipe Flow Calculator Hazen–Williams Equation

2021-2-3  The hydraulic radius, R, is the proportion between the area and the perimeter of your pipe. If the pipe is circular, you will find it according to the following equation: R = A / P = πr² / 2πr = r / 2 = d / 4. where r is the pipe radius, and d is the pipe diameter. You can view and modify all these parameters (area, perimeter, hydraulic radius) in the advanced mode of this pipe flow calculator.

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Flow Rate Calculator - Calculate the flow rate of a pipe

Flow Rate Calculator. Easily calculate the volumetric flow rate of a pipe (a.k.a. discharge rate) given its dimensions and either a pressure difference between its ends or the velocity of the liquid or gas flowing through it. The flow rate calculator can also calculate the mass flow rate of a fluid given its density is known. Input and output support metric and imperial measurement units.

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