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
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
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.
作者简介: 崔天龙,河北工业大学土木与交通学院硕士研究生,主要研究方向为3D打印混凝土和特种水泥材料。王里,副教授,博士生导师,河北工业大学元光学者。澳大利亚The University of Western Australia访问学者,CCPA-3D打印分会委员,CCPA自防护混凝土材料与工程技术分会专家委员,CECS建筑机器人委员会专家委员。主要从事建筑3D打印材料与结构基础研究与创新应用,目前主持国家自然科学基金项目3项,主持河北省重点研发计划、河北省优秀青年科学基金、天津市自然科学基金等10余项科研项目。
引用本文:
崔天龙, 王里, 马国伟, 李之建, 白明科. HB-CSA与膨胀剂对3D打印混凝土收缩开裂性能的影响[J]. 材料导报, 2022, 36(2): 20120078-7.
CUI Tianlong, WANG Li, MA Guowei, LI Zhijian, BAI Mingke. Effect of HB-CSA and Expansion Agent on Shrinkage and Cracking Performance of 3D Printing Concrete. Materials Reports, 2022, 36(2): 20120078-7.
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2022, Vol. 36 
