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Y. Yuan, X. Wang, Y. Tao, "Mechanical performance of stiffening-controllable concrete using a two-component system", in P. Ivanyi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Seventeenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 6, Paper 4.3, 2023, doi:10.4203/ccc.6.4.3

Keywords: digital fabrication, 3D concrete printing, twin-pipe pumping, mechanical behavior, helical static mixer, limestone powder.

Abstract

To control the stiffness of 3D printable concrete, a two-component system (twin-pipe pumping) has been devised. This system involves pumping a cement-based mixture (without an accelerator) and a limestone-based mixture (with a high dosage of the accelerator) separately, which are then combined through a helical static mixer before being extruded. As these two mixtures pass through the helical static mixer, the accelerator present in the limestone-based mixture interacts rapidly with the cement in the cement-based mixture, resulting in a swift stiffening process. This research aims to investigate how the mechanical properties of printed elements are affected by the number of mixing baffles (ranging from 6 to 30) employed in the helical static mixer. To evaluate the printed elements, flexural, compressive, and tensile strength were measured using prismatic, cubic, and cylindrical specimens extracted from printed wall elements. The experimental findings reveal that the printed specimens exhibit anisotropic behavior. Furthermore, an increase in the number of mixing baffles from 6 to 30 enhances the mechanical strength gradually due to improved mixing homogeneity.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 6 PROCEEDINGS OF THE SEVENTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: P. Ivanyi, J. Kruis and B.H.V. Topping Paper 4.3 Mechanical performance of stiffening-controllable concrete using a two-component system Y. Yuan¹, X. Wang^1,2 and Y. Tao² ¹College of Civil Engineering, Tongji University, Shanghai, China ²Department of Structural Engineering and Building Materials, Ghent University, Ghent, Belgium doi:10.4203/ccc.6.4.3 Full Bibliographic Reference for this paper Y. Yuan, X. Wang, Y. Tao, "Mechanical performance of stiffening-controllable concrete using a two-component system", in P. Ivanyi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Seventeenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 6, Paper 4.3, 2023, doi:10.4203/ccc.6.4.3 Keywords: digital fabrication, 3D concrete printing, twin-pipe pumping, mechanical behavior, helical static mixer, limestone powder. Abstract To control the stiffness of 3D printable concrete, a two-component system (twin-pipe pumping) has been devised. This system involves pumping a cement-based mixture (without an accelerator) and a limestone-based mixture (with a high dosage of the accelerator) separately, which are then combined through a helical static mixer before being extruded. As these two mixtures pass through the helical static mixer, the accelerator present in the limestone-based mixture interacts rapidly with the cement in the cement-based mixture, resulting in a swift stiffening process. This research aims to investigate how the mechanical properties of printed elements are affected by the number of mixing baffles (ranging from 6 to 30) employed in the helical static mixer. To evaluate the printed elements, flexural, compressive, and tensile strength were measured using prismatic, cubic, and cylindrical specimens extracted from printed wall elements. The experimental findings reveal that the printed specimens exhibit anisotropic behavior. Furthermore, an increase in the number of mixing baffles from 6 to 30 enhances the mechanical strength gradually due to improved mixing homogeneity. download the full-text of this paper (PDF, 7 pages, 220 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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