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 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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How do concrete rheology, tribology, flow rate and pipe

Feb 01, 2016 · With the recent developments in assessing the thickness of the lubrication layer, pumping pressure in straight pipes can be calculated if the rheological properties of the micro-mortar and concrete are known. In another approach, developed in the early 2000's, the lubrication layer properties are reproduced in a tribometer,,, . This device

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Pumping of Concrete Mixtures: Rheology, Lubrication Layer

The relatively thin lubrication layer has a lower viscosity than the bulk concrete (Choi et al. 2013). Morinaga (1973) and Secrieru et al. (2018b) stated that concrete cannot be pumped without

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Effect of Ultrasound on the Formation of a Lubrication

It was also found that the rheological properties of the lubricating layer remained constant during pumping, whereas the rheological properties of the concrete were found to vary. View Show abstract

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How do concrete rheology, tribology, flow rate and pipe

Feb 01, 2016 · With the recent developments in assessing the thickness of the lubrication layer, pumping pressure in straight pipes can be calculated if the rheological properties of the micro-mortar and concrete are known. In another approach, developed in the early 2000's, the lubrication layer properties are reproduced in a tribometer,,, . This device

Learn More

Estimation of Lubrication Layer Thickness and Composition

Apr 11, 2020 · 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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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

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EFFECTIVE SELECTION OF PUMP FOR WATER AND …

Effective Selection of Pump for Water and Concrete Pumping System 65 EFFECTIVE SELECTION OF PUMP FOR WATER AND CONCRETE studied the properties of the lubrication layer, which rough estimation of the pumping pressure. The thickness of the lubrication layer depends on the concrete mix design and potentially on pipe diameter. X. Sun, H. Ye

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Prediction of Concrete Pumping: Part I—Development of New

The character of the lubricating layer formed near the wall of a pipe during the flow of pumped concrete is a dominant factor facilitating concrete pumping. To predict flow rates of concrete transported by pumping, it is necessary to measure the rheological properties of the lubricating layer before pumping.

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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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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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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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Pumping of Fresh Concrete: Insights and Challenges

4 Lubrication layer formation While pumping, the fresh concrete does not remain homogenous, due to the formation of a lubrication layer near the pipe wall (sometimes also misleadingly called 'slip layer' while no slip between concrete and surface occurs - [19-20] provide evidence of negligible flow velocity near the pipe wall).

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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

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Development of a tribometer to characterize lubrication

Nov 01, 2014 · During pumping of concrete, aggregates tend to move to the center of the pipe, while a more fluid layer, rich with cement paste, is formed near the wall; this layer is called the lubrication layer. In the work of Kaplan [6], the rheological properties of the concrete are described by the Bingham model, identifying a yield stress (Pa) and a

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Effect of lubrication layer on velocity profile of concrete

formation and the properties of the lubrication layer near the pipe surface, in order to be able to accurately that occurs during the concrete flow through a pumping pipe. This friction

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A new method to estimate rheological properties of

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

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Lubrication layer properties during concrete pumping

9 rows · Mar 01, 2013 · Abstract. In order to progress in the understanding of the physical phenomena involved in the

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RILEM - Publications

lubrication layer near the surface pipe. The influence of rheological properties of the fresh concrete pump test on a construction site, specifically focusing on the risk of thixotropy. occurring during a short stop of the pumping operations, showed to provoke major problems while trying to resume pumping. The lessons-learnt helped to

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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 …

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