Journal
CEMENT AND CONCRETE RESEARCH
Volume 155, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2022.106785
Keywords
3D printing cementitious material; Additive manufacturing; Shaping plate; Mechanical properties; Microstructure; Single-phase computational fluid dynamics; simulation
Funding
- National Natural Science Foundation of China [51738003, 11772120]
- Primary Research & Development Plan of Jiangsu Province [BE2016187]
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This study achieved precise control of the shape of 3D printed cement-based structures, elimination of curved sides and internal stress concentration, and enhancement of mechanical properties through a specially designed shaping plate apparatus. Results show that the shaping plate apparatus effectively constrains the expansion of extrudate, improves the surface finish quality and mechanical properties of the printed structure.
Precisely controlling the shape of the printed-layers, eliminating the curved sides and internal stress concentration, and increasing the mechanical properties are essential to guarantee the quality of 3D printed cementbased structures. This work aims at achieving the above-mentioned targets through a specially designed shaping plate apparatus. The pressure (stress) distribution in the printed structure with a shaping plate apparatus (SP-3DPC), and the cross-sectional shape, microstructure and mechanical properties of SP-3DPC were systematically investigated. Results indicate that using the shaping plate apparatus may slightly reduce the printing speed, but it can effectively constrain the free expansion of extrudate, control its cross-sectional geometry, and improve the surface finish quality and mechanical properties of the printed structure. This study provides a theoretical basis and technical guidance for the design and application of the shaping plate apparatus.
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