INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Effect of HB-CSA and Expansion Agent on Shrinkage and Cracking Performance of 3D Printing Concrete |
CUI Tianlong1, WANG Li1,2, MA Guowei1,2, LI Zhijian1, BAI Mingke3
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1 School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401,China 2 Tianjin Key Laboratory of Prefabricated Building and Intelligent Construction,Tianjin 300401,China 3 Yaobai Special Cement Technology R & D Co., Ltd., Xi'an 710100,China |
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Abstract Limited by the requirements of continuous extrusion process and the size of nozzle, 3D printing materials are usually fine aggregate compo-sites. Due to the large specific surface area of fine aggregate, printing composites need more slurry to wrap the aggregate, resulting in a high proportion of cementitious materials. The inherent layer-upon-layer stacking process improve the water evaporation rate of printing materials, leading to high shrinkage and cracking risks. 3D printing cement-based composites were prepared by mixing high Belite sulphoaluminate cement (HB-CSA) and UEA expansive agent, and the printability, mechanical properties and shrinkage cracking properties were experimentally tested and evaluated. The results show that the 90 d shrinkage rate and early cracking area of the prepared material can be reduced by 8% and 35% respectively when 5% HB-CSA is adopted. The flowability of the prepared material is 190 mm, and the initial setting time is 45 min, which can meets the requirements of 3D printing extrusion process; when 5% HB-CSA and 10% UEA expansion agent are mixed, the 90 d shrinkage rate and early cracking area of the prepared material can be reduced by 30% and 33% respectively.
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Published: 25 January 2022
Online: 2022-01-26
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Fund:National Natural Science Foundation of China(51808183,51878241),Natural Science Foundation of Tianjin (20JCYBJC00710) and Natural Science Foundation of Hebei for Outstanding Youth Scholar (E2021202039). |
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