Effect of cement mixture technological properties on the layered 3D-printed elements quality
DOI:
https://doi.org/10.24866/2227-6858/2025-1/139-154Keywords:
3D printing, mixture plasticity, plasticity control method, 3D-printed concrete strengthAbstract
In connection with the relevance of quality control problem of the 3D printing process, the aim of the work was to substantiate the rational range of mixture technological properties to ensure the stability of the printed structure and the 3D-printed concrete strength properties., The patented composition of powder-like 3D printable mixture was used in the experiments. In order to evaluate the technological properties, we used a complex criterion for assessing the manufacturability of the 3D printable mixture in terms of plastic strength, determined using a specially designed conical plastometer. According to the results of the approval of the device, its suitability for operational control of the mixture quality in the whole technologically possible range of printing conditions was established. As part of the research, a model element was printed on a laboratory 3D printer and its quality and stability were evaluated. After curing, the element was sawn into samples of standardised sizes for compressive and flexural tests along and across the layer’s printing direction. It was found that to ensure the quality and stability of the printed structure, the reasonable range of plastic strength values is 0.8–2.8 kPa. According to the strength criteria of layered 3D printed concrete the re-asonable range of plastic strength is 0.8–1.8 kPa. When the plasticity values increase above 1.8 kPa, a decrease in the bonding strength of the layers and the compressive and flexural strength of the 3D printed concrete is recorded.
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