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lubrication layer properties during concrete pumping

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Lubrication layer properties during concrete pumping ...

Mar 01, 2013  This layer is often called in literature lubrication layer or sometimes slippage layer. Its existence was first suggested by Aleekseev and Weber .Morinaga noted that, from a theoretical point of view, considering the rheological parameters of the material, pumping of concrete would not be possible without the formation of this lubrication layer. . Sakuta et al. went further and showed that the ...

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Lubrication layer properties during concrete pumping ...

The rheological properties of the lubrication layer between the bulk concrete and the wall of the pumping pipe is a key factor governing the pumpability of concrete.

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Lubrication layer properties during concrete pumping ...

Abstract. In order to progress in the understanding of the physical phenomena involved in the pumping process of concrete, we study in this work the properties of the lubrication layer, which forms between the pipe and the bulk material. Using ultrasonic velocity profiler, we measure the thickness of this lubrication layer in the case of real ...

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Estimation of Lubrication Layer Thickness and

During concrete pumping, a lubrication layer is formed near the pipe wall. Extensive research has been performed on measuring and modeling the properties of this layer and using these values to predict pumping pressures. However, there are numerous discussions in

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(PDF) Effect of lubrication layer on velocity profile of ...

The rheology of concrete is predominant for the required pressures in a pumping pipe. However, more detailed information is required on the formation and the properties of the lubrication layer ...

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Pumping of Concrete Mixtures: Rheology, Lubrication Layer ...

A four-phase research study was carried out to: (1) improve the existing methodology of rheological characterization of the lubrication layer formed during pumping, (2) evaluate the effect of concrete mixture constituents and proportioning on rheological properties of concrete and the lubrication layer, (3) asses the effect of pumping and ...

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Viscoelastic Properties of Fresh Cement Paste to Study the ...

The existence of the lubrication layer was first suggested by Aleekseev (1952) and Weber (1968). Morinaga (1973) noted that based on theoretical flow behaviors of concrete, the pumping of concrete would not be possible without the formation of the lubrication layer. Sakuta et al. (1979) reported that the flow properties of the bulk material were

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Estimation of Lubrication Layer Thickness and Composition ...

During concrete pumping, a lubrication layer is formed near the pipe wall. Extensive research has been performed on measuring and modeling the properties of this layer and using these values to predict pumping pressures. However, there are numerous discussions in

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Pumping of concrete mixtures: rheology, lubrication layer ...

A four-phase research study was carried out to: (1) improve the existing methodology of rheological characterization of the lubrication layer formed during pumping, (2) evaluate the effect of concrete mixture constituents and proportioning on rheological properties of concrete and the lubrication layer, (3) asses the effect of pumping and ...

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Effect of lubrication layer on velocity profile of ...

Jan 22, 2015  The rheology of concrete is predominant for the required pressures in a pumping pipe. However, more detailed information is required on the formation and the properties of the lubrication layer near the pipe surface, in order to be able to accurately predict the pressure-discharge relation. By means of experimental research in combination with advanced numerical simulations, the lubrication ...

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Changes in fresh properties of flowable concrete induced ...

fresh concrete properties are affected in diverse ways by pumping, with the results being dependent on the concrete fresh properties, and pumping parameters. Additionally, an attempt was performed to reverse engineer the composition of the so called “lubrication layer” through the science of rheology.

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Changes in concrete properties during pumping and ...

Jun 01, 2018  The hydraulic pressure gradient within concrete during pumping triggers the formation of the lubricating layer mainly due to flow-induced particle migration [12,13], but also due to the separation of water from the fines paste . The water separation is facilitated by the fines of concrete matrix which act as a filter.

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Estimation of Lubrication Layer Thickness and Composition ...

During concrete pumping, a lubrication layer is formed near the pipe wall. Extensive research has been performed on measuring and modeling the properties of this layer and using these values to predict pumping pressures. However, there are numerous discussions in the literature about the composition and thickness of this layer: can it be ...

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PCC : Pumping of concrete

Behavior of concrete in pipes, including the formation, composition and properties of the lubrication layer; Mechanisms of blocking, and including the influence of thixotropy; Preparation of pumping pipes before pumping; Test methods to characterize the lubrication layer properties; Monitoring equipment during pumping (P, Q, velocities, )

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Publications George Scherer’s Materials Research Group ...

Myoung Sung Choi, Nicolas Roussel, Young Jin Kim, Jin Keun Kim, “Lubrication layer properties during concrete pumping”, Cement and Concrete Research, 45 (2013) 69-78. 6. Myoung Sung Choi , Young Jin Kim, Seung Hee Kwon, “Prediction on pipe flow of pumped concrete based on shear-induced particle migration”, Cement and Concrete Research ...

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Pipe flow of pumping wet shotcrete based on lubrication layer.

Jun 30, 2016  The different thickness of lubrication layers had different numerical simulation results that the thicker the lubrication layer is, the smaller the pipe pressure is. The simulated pumping pressure of 1 mm lubrication layer was approximately 1.7 times higher than those of

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Report No. K-TRAN: KSU-14-2 Best Practices for Concrete ...

research evidenceas to what affects concrete pumpability and how pumping changes concrete properties. A three-phase research study was carried out to (1) investigate performance of pumped concrete in field conditions, (2) identify concrete properties affecting pumpability, and (3) assess the effects of pumping on concrete air void system.

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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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10.1016/j.cemconres.2012.11.001 10.1016/j ... - DeepDyve

Jun 11, 2020  However, in order to apply concrete pumping to large-scale construction projects, a priori prediction of concrete flow rates, which induce the construction process duration, is necessary from a practical logistic point of view. This prediction shall be based on the analysis of the concrete flow typology within a pumping pipe.

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1. Introduction

Besides, the lubrication layer is of vital importance in concrete pumping process, which relates to the shear-induced migration of particle inside the pumping pipe [12]. Based on the theory of tribology, the rheological properties of the lubricating layer can be obtained, and the friction on the boundary can be calculated accurately [ 13 ].

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Experimental Observation on Variation of Rheological ...

Dec 29, 2018  Workability of concrete varies during pumping. Even though concrete satisfies the required workability before pumping, it often does not satisfy the required standard after pumping. Moreover, serious problem could happen such as segregation and blockage. In this study, the rheological properties of concrete change during pumping from the pressure distribution over the pipe length

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Lubrication layer properties during concrete pumping - 科研通

Lubrication layer properties during concrete pumping ... 期刊:Cement and Concrete Research ... On Creep during Primary Consolidation of Clays 2510 Recurrent Hyperparathyroidism in a Patient with Chronic Renal Failure after Total Parathyroidectomy and Autotransplantation 1500

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Estimation of Lubrication Layer Thickness and Composition ...

During concrete pumping, a lubrication layer is formed near the pipe wall. Extensive research has been performed on measuring and modeling the properties of this layer and using these values to predict pumping pressures. However, there are numerous discussions in the literature about the composition and thickness of this layer: can it be ...

View More

Estimation of Lubrication Layer Thickness and Composition ...

During concrete pumping, a lubrication layer is formed near the pipe wall. Extensive research has been performed on measuring and modeling the properties of this layer and using these values to predict pumping pressures. However, there are numerous discussions in the literature about the composition and thickness of this layer: can it be considered mortar, a micromortar, or is it cement

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A Review on the Pumping Behavior of Modern Concrete

The hydraulic pressure gradient created during pumping facilitates the formation of lubrication layer (Secrieru et al. 2018a). The lubrication layer is a mortar-like layer formed on the pipe wall during the pumping process. The pumping resistance is in essence determined by the fric-tion between the pipe and the lubrication layer (Kwon et

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Pipe flow of pumping wet shotcrete based on lubrication layer

Jun 30, 2016  Myoungsung C, Roussel N, Kim Y, Kim J (2013) Lubrication layer properties during concrete pumping. Cem Concr Res 45:69–78. Article Google Scholar Roussel N (2006) A thixotropy model for fresh fluid concretes: theory validation and applications. Cem Concr Res 36(10):1797–1806. Article Google Scholar

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Effects of Ultrafine Powders on the Properties of the ...

May 05, 2020  The effects of these ultrafine powders on rheology of the concrete and the properties of the lubrication layer, near the steel pipe–concrete interface, are studied by a portable rheometer and tribometer. The thickness of the lubrication layer of each concrete mixture is determined using a microindentation test method.

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

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 lubricating layer obtained from the newly developed tribometer can give a good prediction of

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Publications George Scherer’s Materials Research Group ...

Myoung Sung Choi, Nicolas Roussel, Young Jin Kim, Jin Keun Kim, “Lubrication layer properties during concrete pumping”, Cement and Concrete Research, 45 (2013) 69-78. 6. Myoung Sung Choi , Young Jin Kim, Seung Hee Kwon, “Prediction on pipe flow of pumped concrete based on shear-induced particle migration”, Cement and Concrete Research ...

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A new method to estimate rheological properties of ...

pipe section during concrete pumping. The flow rate per unit hour can be calculated by integrating the velocities of the lubricating layer in the pipe section, the shearing flow layer of the inner concrete, and the plug flow layer (Tattersall and Banfill 1983), and the following Eq.

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Report No. K-TRAN: KSU-14-2 Best Practices for Concrete ...

research evidenceas to what affects concrete pumpability and how pumping changes concrete properties. A three-phase research study was carried out to (1) investigate performance of pumped concrete in field conditions, (2) identify concrete properties affecting pumpability, and (3) assess the effects of pumping on concrete air void system.

View More

Changes in rheology of self-consolidating concrete induced ...

Feb 02, 2016  The properties of the lubrication layer are measured through tribology carried out on concrete [8, 14], or are assumed to be the rheological properties of a wet-screened mortar [11–13]. It is also well known that the concrete properties can alter during the pumping operation.

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Experimental Observation on Variation of Rheological ...

Dec 29, 2018  Workability of concrete varies during pumping. Even though concrete satisfies the required workability before pumping, it often does not satisfy the required standard after pumping. Moreover, serious problem could happen such as segregation and blockage. In this study, the rheological properties of concrete change during pumping from the pressure distribution over the pipe length

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RILEM - Publications

Using tribology, or by combining the rheological properties of the concrete and its constituent mortar and knowing the thickness of the lubrication layer, it is shown that pressure losses during pumping of concrete can be successfully predicted.

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Viscoelastic Properties of Fresh Cement Paste to Study the ...

During concrete pumping, the migration and redistribution of particles occur in a pipe and the lubrication layer that forms between the bulk concrete and the pipe wall is the governing factor determining the flow behavior.

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