Insights in thixotropic concrete pumping by a Poiseuille Related Information

RILEM - Publications

concrete pump test on a construction site, specifically focusing on the risk of thixotropy. Fresh concrete has been pumped in a horizontal closed-loop pumping pipe with a total length of 600 meter. In steady-state pumping conditions, the pumping operation was very successful, and in agreement with the expectations. However, the thixotropic effects,

Rheology of cement paste under high pressure - ScienceDirect

Mar 01, 2017 · 1. Introduction. Pumping is a general way to transport cement-based materials at construction sites, .Such pumped mixtures are subjected to high pressure during pumping, especially in large-scale construction such as high-rise buildings, long-span bridges, long-distance tunnels, oil-well cementing applications, and ground strengthening by injection of paste or mortar,,, .

Prediction of pumping pressure by means of new tribometer

Mar 01, 2015 · The placing boom of the concrete pump was not used. Instead, the 30 m loop circuit was directly attached to the concrete pump, as can be seen in Fig. 1.The main components of the circuit were two straight horizontal sections each measuring 11 m in length with two different diameters: 100 and 125 mm (4" and 5"), as indicated in Fig. 2.A combination of reducers was installed at the beginning

Thixotropic effects during large-scale concrete pump test

During recent years, the fundamentals of pumping fresh concrete have been intensively studied worldwide. New insights have been gained concerning the important role of the lubrication layer near the surface pipe. The influence of rheological properties of the fresh concrete, like yield stress, viscosity, and shear thickening behavior, is now well understood, and can be fairly accurately modelled.

Rheology of polysulfone-N-methylpyrrolidone solutions used

Insights in thixotropic concrete pumping by a Poiseuille flow extension. Rheology of polysulfone-N-methylpyrrolidone solutions used in the technology of lithium-ion batteries. Rheological behavior of a bentonite mud. Correlating Coating Quality of Coverage with Rheology for Mica-Based Paints. See more

Pumping of Fresh Concrete: Insights and Challenges

formed in front of the concrete, is based on the friction principle [12, 14-15]. If the concrete transitions from a suspension into a soil-like material in a small section of the pipes, it may block the entire line. 3.2 Flow regime Assuming concrete is a suspension, to predict pumping pressure, it is essential to know in which regime concrete is

Thixotropic effects during large-scale concrete pump tests

Due to thixotropic effects, restarting the pumping operation can be a very challenging task. This paper reports on a large-scale concrete pump test on a construction site, specifically focusing on the risk of thixotropy. Fresh concrete has been pumped in a horizontal closed-loop pumping pipe with a …

Insights in thixotropic concrete pumping by a Poiseuille

Insights in thixotropic concrete pumping by a Poiseuille flow extension De Schryver Robin, De Schutter Geert; Affiliations De Schryver Robin Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Faculty of Engineering and Architecture, Ghent University, Technologiepark-Zwijnaarde 60, B-9052 Ghent, East

How do concrete rheology, tribology, flow rate and pipe

Feb 01, 2016 · Seen the good correlation between concrete plastic viscosity and pumping pressure, one can wonder if a similar correlation exists between pumping pressure and V-Funnel flow time. This is demonstrated in Fig. 9, showing a good correlation between the pressure loss in the 100 mm pipes at a flow rate of 8 l/s, and the V-Funnel flow time for SCC.

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Experimental Insights into Concrete Flow-Regimes Subject

To do so, deeper insights and more experimental evidence on shear-induced particle migration of concrete during pumping are required. Shear-induced particle migration occurs when the granular phase of concrete is subject to non-uniformly distributed shear stresses and shear rates; see Figure 1 for the pumping process.

Metrology Needs for Predicting Concrete Pumpability

Jun 22, 2015 · With the increasing use of pumping to place concrete, the development and refinement of the industry practice to ensure successful concrete pumping are becoming important needs for the concrete construction industry. To date, research on concrete pumping has been largely limited to a few theses and research papers. The major obstacle to conduct research on concrete pumping is that it …

Insights in thixotropic concrete pumping by a Poiseuille

Insights in thixotropic concrete pumping by a Poiseuille flow extension Rheology of polysulfone-N-methylpyrrolidone solutions used in the technology of lithium-ion batteries Rheological behavior of a bentonite mud Correlating Coating Quality of Coverage with Rheology for Mica-Based Paints

Rheological parameters, thixotropy and creep of 3D-printed

Apr 01, 2020 · The 3D-printed CSA cement paste was continuously extruded by a screw mixing under a constant air pump pressure of 0.3 MPa, loading speed of 15 mm/s, and feed rate of 10 mm/s. In addition, the distance from the nozzle to the printed layers was set to 2.4 mm, which was lower than the diameter of the nozzle, to eliminate interface defects.

Changes in rheology of self-consolidating concrete induced

Feb 02, 2016 · Pumping is an easy and flexible process to place concrete inside a formwork. Many studies have recently been performed to understand and optimize the pumping process and identify the main differences between pumping of conventional vibrated concrete and self-consolidating concrete (SCC). However, due to pumping, changes in fresh concrete properties and the air-void system have …

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Prediction of pumping pressure by means of new tribometer

Mar 01, 2015 · The placing boom of the concrete pump was not used. Instead, the 30 m loop circuit was directly attached to the concrete pump, as can be seen in Fig. 1.The main components of the circuit were two straight horizontal sections each measuring 11 m in length with two different diameters: 100 and 125 mm (4" and 5"), as indicated in Fig. 2.A combination of reducers was installed at the beginning

University of Louisville ThinkIR: The University of

The thixotropic behaviors of concrete can be good representatives of its flow behaviors on the job site. For example, the break-down aspect of thixotropy can help to explain how its flow behavior can impact concrete pumping and its buildup aspect can help to estimate the lateral pressure on formwork and concrete resistance to segregation.

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Applied Rheology: Publications

Extension of the Poiseuille formula for shear-thickening materials and application to Self-Compacting Concrete Appl. Rheol. 18:6 (2008) 62705 (11 pages) In practice, while placing concrete in a formwork by pumping, the pressure generated by the pump is not controlled.