INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Investigation of the Printability and Mechanical Properties of 3D Printing UHPC |
BAI Gang, WANG Li, WANG Fang, CHENG Xinrui
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School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China |
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Abstract The preparation and performance optimization of concrete materials is the key of 3D printing (3DP) construction technology. The research of 3D printing ultra-high performance concrete (3DP-UHPC) can promote the popularization and application of this technology. Ultra-high performance concrete (UHPC) belongs to the pseudo-plastic fluid, and shear thickening occurs under the compression, which is not conducive to 3D printing. In this paper, a modified method of cement-based composite material, which is controlled by chemical acceleration and physical flocculation, was proposed to optimize the mix proportion of sulphoaluminate cement, cellulose and clay, and to promote the gradual change of UHPC flow pseudo-plastic fluid to bingham fluid, so as to prepare 3DP-UHPC material. The basic mechanical properties of the printing material, such as compression, tensile and bending, were tested and the micro morphology was analyzed. The results show that, adjusting the acceleration/flocculation (A/F) radio is helpful to optimize the 3D printability of UHPC and enhance the mechanical properties of UHPC. When the mass fraction of sulphoaluminate cement instead of Portland cement is 10%, the fluidity is controlled in the range of 180—200 mm, and the A/F ratio meets the corresponding 3D printable performance requirements. 3DP-UHPC has compressive strength of 129.6 MPa, bending strength of 16.3 MPa, tensile strength of 4.6 MPa and ultimate tensile rate of 1.2%. The printing process is beneficial to the formation of directional distribution of steel fiber and the improvement of toughness of UHPC.
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Published: 01 July 2021
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Fund:Natural Science Foundation of China (51878241) and Post-graduate's Innovation Fund Project of Hebei Province (CXZZBS2019042). |
About author:: Gang Bai received his B.S. degree in June 2018 from Hebei University of Technology City College in engineering. He is currently pursuing his Ph.D. degree at Hebei University of Technology, focusing on the research of 3D concrete printing (3DCP). Li Wang, master tutor, assistant to the president, YUANGUANG scholar of Hebei University of Techno-logy. He received his Ph.D. degrees in June 2017 from China University of Mining and Technology (Beijing), a visiting scholar from the University of Western Australia, a member of the innovation team of “giant program” in Hebei Province, member of 3D printing branch of China Concrete and Cement Products Association, and expert committee member of self-protection concrete materials and engineering technology branch. The main research directions are 3D printing concrete, new structure and new materials, advanced construction technology, etc. |
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