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Experimental Investigation of the Pumping of a Model-Concrete through Pipes

机译：模型混凝土管道抽水的实验研究

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摘要

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 measurements. A main problem is the optical inaccessibility of the material, which prevents estimations about, e.g., the thickness of the plug flow or particle migration. In this paper, the pneumatic pumping of a transparent model concrete is performed by means of a test plant. The flow profile over the entire pipe cross-section is resolved in time and space via Particle Image Velocimetry (PIV) measurements. This allows the comparison with the analytical flow profile from rheological measurements of the material using the Buckingham–Reiner equation. A reduction of the pressure loss to around 60% induced through segregation of the material is found. These measurements reflect the rheology of the material under realistic pumping conditions including particle migration. This makes it possible for the first time to observe a transparent material with concrete-like rheology under pulsating pumping conditions and to compare the true and calculated time-resolved pressure loss.
机译：处理新鲜混凝土的许多实际方面取决于其流变性，例如材料的泵送。已知在该过程中形成润滑层，其显着降低了泵送压力。但是，在通常的流变测量中几乎不能考虑这些现象。主要问题是材料的光学不可及性，这妨碍了对例如活塞流的厚度或颗粒迁移的估计。在本文中，通过试验设备对透明模型混凝土进行气动泵送。通过粒子图像测速（PIV）测量，可以在时间和空间上解析整个管道横截面上的流量分布。这可以与使用白金汉-莱纳方程进行的材料流变学测量得到的分析流动曲线进行比较。发现通过材料的分离引起的压力损失降低到约60％。这些测量值反映了在包括颗粒迁移在内的实际泵送条件下材料的流变性。这使得首次在脉动泵送条件下观察具有混凝土流变特性的透明材料成为可能，并可以比较真实的和计算出的时间分辨压力损失。

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