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Digital printing of mortar in carrier liquid: comparison of approaches to predict print stability

机译：载体砂浆的数字印刷：预测印刷稳定性的方法比较

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摘要

Nowadays, 3D printing of cantilevered shape poses a great challenge within the digital construction through a carrier liquid as a temporary formwork. This technique allows the printing of truss bars shapes, hollow cylinders and act as a leap reducing the utilization of materials and the global carbon footprint. To transfer this new concept to the industrial process, it is essential to predict the stability of the cementitious material’s shape in the carrier liquid. In this work, three different criteria were investigated, the printed cementitious mortar and the carrier liquid attached to the rheological properties are taken into study. Rheometry measurements have been carried out on both cement-based materials and the carrier liquids. A cantilevered shape is printed with a home-made 3D printer. A simple stability criterion which is independent of the final shape is first highlighted. It is reliable to give a first approximation of the stability at the exit of the nozzle regarding the material properties whatever was the element shape. Besides, two different approaches based on the mechanical strength approach and the final geometry of the printed shape have also been proposed. The experimental results show that the reliability of these different approaches to predict the stability of the extruded materials or final shape are finally confirmed by flow visualizations.
机译：如今，悬臂形状的3D打印通过载体液体作为临时模板构成数字结构内的巨大挑战。该技术允许打印桁架杆形状，空心圆柱体，并充当利用材料和全球碳足迹的飞跃。为了将这种新概念转移到工业过程中，必须预测载体液体中水泥材料形状的稳定性必要的。在这项工作中，研究了三种不同的标准，将印刷的水泥砂浆和附着于流变性质的载体液体进行研究。已经在水泥基材料和载体液体上进行了流变测量。悬臂形状用自制的3D打印机打印。首先突出显示与最终形状无关的简单稳定性标准。提供关于材料特性的喷嘴出口处的稳定性的第一近似是可靠的，无论是什么是元素形状。此外，还提出了基于机械强度方法的两种不同的方法和印刷形状的最终几何形状。实验结果表明，这些不同方法预测挤出材料或最终形状的稳定性的可靠性最终通过流动可视化确认。

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