Insights in thixotropic concrete pumping by a Poiseuille flow

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  • Pressure exerted on formwork by self-compacting concrete

    Self-Compacting Concrete (SCC) is a flowable concrete that exerts high pressure on formwork. SCC is the most commonly used concrete worldwide for construction applications due to its cost-effectiveness. The high flow of SCC reduces both the number of

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    The direction of flow is from greater to lower pressure. Flow rate Q is directly proportional to the pressure difference P 2 −P 1, and inversely proportional to the length l of the tube and viscosity η of the fluid. Flow rate increases with r 4, the fourth power of the radius.

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  • Insights in thixotropic concrete pumping by a Poiseuille

    Jan 01, 2020 · Insights in thixotropic concrete pumping by a Poiseuille flow extension Rheology of polysulfone-N-methylpyrrolidone solutions used in the technology of …

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  • Metrology Needs for Predicting Concrete Pumpability

    Jun 22, 2015 · 2.2. Slip-Layer. Several research groups have investigated the slip-layer of concrete flow in a pipe. Choi et al. [5, 6] measured the thickness of the slip-layer using an Ultrasonic Velocity Profiler (UVP) in pumping circuits using industrial equipment and found that there is a 2 mm thick layer along the inner surface of the pipe.However, the layer thickness could vary depending on the mixture

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    3D printing has been getting increasing attention from both industry and academy in recent years. Unlike traditional construction processes, 3D cementitious material printing requires more accurate control on the pumping flow rate, which is known to be affected by the material rheology. In this paper, the effect of fresh rheology on the flow rate of cementitious material was studied

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  • Materials | Free Full-Text | Effect of Admixtures on the

    Chemical admixtures can change the shear field of concrete under the pumping process . Shearing flow, similar to Poiseuille flow, describes the pumping flow of self-consolidating concrete, whereas the plug flow of conventional concrete is dominant on a lubricating layer of the inner surface of the pipeline.

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    Poiseuille's law, volume flow rate through a blood vessel is proportional to its radius to the fourth power i.e. V ∝ R4). A. blood flow would decrease to half (1/2) the value for an artery with diameter 2 mm. B. blood flow would decrease to a quarter (1/4) of the value for an artery with diameter 2 mm.

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  • 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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  • Changes in rheology of self-consolidating concrete induced

    Feb 02, 2016 · Pumping of concrete is the fastest and most efficient way to place concrete inside a formwork. In the past, several practical guidelines were developed to optimize concrete mix designs, to predict pumping pressure or to optimize the layout of pumping circuits [1–3].More recently, scientific studies have contributed to understanding the flow process of concrete inside a pipe.

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  • Dimitri Feys *, Ronny Verhoeven, Geert De Schutter

    the Poiseuille formula, for shear-thickening materials with a yields stress, described by the modified Bingham equation. This formula is applied to flow-tests with self-compacting concrete. The results prove the applicabil-ity of this extended Poiseuille formula, showing that the flow is occurring in laminar regime, with no significant wall slip.

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  • How do concrete rheology, tribology, flow rate and pipe

    Feb 01, 2016 · More details on the pump, pressure and flow rate measuring systems and procedures can be found in Ref. . 2.2. Measurement procedure. Each concrete was delivered to the laboratory by a ready-mix truck. After adjusting the mixture to achieve the targeted slump flow, the concrete …

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  • Thixotropy of SCC and Its Effects on Formwork Pressure

    Due to thixotropy, concrete exhibits higher viscosity when at rest than when flowing. 2 Flows Under Its Own Mass When SCC is flowing, a low viscosity means minimal resistance to flow. Formwork Pressure When SCC is at rest, a high viscosity reduces formwork pressure… Segregation Resistance …and prevents particles from settling. + +

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