pumping of concrete mixtures rheology lubrication layer
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Pumping of Concrete Mixtures: Rheology, Lubrication Layer ...

Pumping is the most utilized placement technique to deliver fresh concrete from the concrete mixer to the formwork on construction site. Compared to other available placement methods, such as bucket-and-crane or conveyor belts, pumping offers superior placement rates while reducing the required labor cost. Despite the fact that concrete pumping has been utilized on job sites around the world ...

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

Corpus ID: 139186376. Pumping of concrete mixtures: rheology, lubrication layer properties and pumping pressure assessment @inproceedings{Vosahlik2018PumpingOC, title={Pumping of concrete mixtures: rheology, lubrication layer properties and pumping pressure assessment}, author={J. Vosahlik}, year={2018} }

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Prediction of Concrete Pumping Using Various Rheological ...

08-07-2014  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 ...

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Read Download Pumping Of Concrete Mixtures PDF – PDF

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 pumping pressure on concrete fresh properties and the ...

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A new method to estimate rheological properties of ...

A new method to estimate rheological properties of . lubricating layer for prediction of concrete pumping . Kyong Pil Jang1a, Woo Jae Kim2b, Myoung Sung Choi3c and Seung Hee Kwon 1. 1Department of Civil and Environmental Engineering, Myongji University, Republic of Korea . 2Engineering Center, POSCO Engineering and Construction, Republic of Korea

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Rheological and pumping behaviour of 3D printable ...

01-01-2021  In the current study, the rheological parameters of bulk concrete and lubrication layer for printable mixtures with increasing aggregate content are determined by a dynamic shear rheometer and tribometer, respectively. The pumping studies were carried out with a screw-pump.

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Assessment and prediction of concrete flow and 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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Prediction of Concrete Pumping Using Various Rheological ...

08-07-2014  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 ...

Get Price

Read Download Pumping Of Concrete Mixtures PDF – PDF

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 pumping pressure on concrete fresh properties and the ...

Get Price

Rheological and pumping behaviour of 3D printable ...

01-01-2021  In the current study, the rheological parameters of bulk concrete and lubrication layer for printable mixtures with increasing aggregate content are determined by a dynamic shear rheometer and tribometer, respectively. The pumping studies were carried out with a screw-pump.

Get Price

Assessment and prediction of concrete flow and 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.

Get Price

A new method to estimate rheological properties of ...

The most crucial factor determining the pumping performance of concrete is the characteristics of the lubricating layer formed between the pipe wall and the inner concrete. Thus, it is important to accurately identify the rheological properties of the lubricating layer to predict the pumping of concrete. In this study, a new method is proposed for measuring the rheological properties of the ...

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Experimental Investigation of the Pumping of a Model ...

Many practical aspects of processing fresh concrete depend on its rheology, such as the pumping of the material. It is known that a lubricating layer is formed in the process, which significantly reduces the pumping pressure. However, these phenomena can hardly be considered in the usual rheological

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Formation of lubricating layer and flow type during ...

30-07-2018  Formation of lubricating layer is a prerequisite of concrete pumpability. • Lubricating layer thickness amounts to a few millimetres. • Concrete exhibits either plug flow or shear flow or a combination of both. • Flow type is defined at low flow rates. • Pumping pressure estimated using rheological tools is verified on laboratory scale.

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State of the Art on Prediction of Concrete Pumping

rheological properties of slip layer (or called lubricating layer) are first introduced. 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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A Review on the Pumping Behavior of Modern Concrete

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 al. 2013; Jo et al. 2012). The friction at the pipe-concrete

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Estimation of Lubrication Layer Thickness and Composition ...

11-04-2020  of concrete and its constituent (micro-) mortar [12–14]. In the latter case, the thickness of the lubrication layer needs to be known before applying capillary rheometer principles on pipe flow. In case of the interface rheometers and the Sliper, the thickness of the lubrication layer is not necessary, but can also not be retrieved from the ...

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Prediction of Concrete Pumping Using Various Rheological ...

08-07-2014  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 ...

Get Price

Experimental Investigation of the Pumping of a Model ...

Many practical aspects of processing fresh concrete depend on its rheology, such as the pumping of the material. It is known that a lubricating layer is formed in the process, which significantly reduces the pumping pressure. However, these phenomena can hardly be considered in the usual rheological

Get Price

Download Pumping-Of-Concrete-Mixtures eBook PDF and Read ...

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 pumping pressure on concrete fresh properties and the ...

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Effect of lubrication layer on velocity profile of ...

22-01-2015  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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A new method to estimate rheological properties of ...

The most crucial factor determining the pumping performance of concrete is the characteristics of the lubricating layer formed between the pipe wall and the inner concrete. Thus, it is important to accurately identify the rheological properties of the lubricating layer to predict the pumping of concrete. In this study, a new method is proposed for measuring the rheological properties of the ...

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Prediction of Concrete Pumping Part I-Development of New

Many practical aspects of processing fresh concrete depend on its rheology, such as the pumping of the material. It is known that a lubricating layer is formed in the process, which significantly reduces the pumping pressure. However, these phenomena can hardly be considered in the usual rheological

Get Price

State of the Art on Prediction of Concrete Pumping

rheological properties of slip layer (or called lubricating layer) are first introduced. 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.

Get Price

A Review on the Pumping Behavior of Modern Concrete

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 al. 2013; Jo et al. 2012). The friction at the pipe-concrete

Get Price

Estimation of Lubrication Layer Thickness and Composition ...

11-04-2020  of concrete and its constituent (micro-) mortar [12–14]. In the latter case, the thickness of the lubrication layer needs to be known before applying capillary rheometer principles on pipe flow. In case of the interface rheometers and the Sliper, the thickness of the lubrication layer is not necessary, but can also not be retrieved from the ...

Get Price

"Prediction of Pumping Pressure by Means of New Tribometer ...

Predicting pressure during pumping has received special attention in recent years. For conventional vibrated concrete (CVC), Kaplan et al. developed a tribometer to characterize the properties of the lubrication layer that is formed when concrete flows in a pipeline, to predict pressure. As this approach is limited to CVC, a new tribometer and data treatment procedure were recently developed ...

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