Influence of printing parameters on 3D printing engineered cementitious composites (3DP-ECC)

被引：82
作者：
Zhou, Wen [1 ]
Zhang, Yamei [2 ]
Ma, Lei [2 ]
Li, Victor C. [1 ]
机构：
[1] Univ Michigan, Dept Civil & Environm Engn, Ann Arbor, MI 48109 USA
[2] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China
来源：
CEMENT & CONCRETE COMPOSITES | 2022年 / 130卷
关键词：
Engineered cementitious composites (ECC); 3D printing; Mechanical properties; Micro-structure; Printing parameter; MECHANICAL PERFORMANCE; DIGITAL FABRICATION; FRESH PROPERTIES; BOND STRENGTH; CONCRETE; EXTRUSION; DESIGN;
D O I：
10.1016/j.cemconcomp.2022.104562
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
3D printing of engineered cementitious composites (3DP-ECC) serves as an effective means to enable digital and automated construction while removing the dependence of steel reinforcement typical in normal concrete construction. As generally recognized, process control in 3DP is as crucial as material constituents to the per-formance of the printed structure. Printing parameters pose direct influence on the micro-structure of material, which further impacts the macro-scale properties of printed ECC. In this paper, the effects of different nozzle standoff distances and nozzle travelling speeds are investigated. It is found that lowering the nozzle standoff distance within a certain range increases the in-plane tensile strength and strain capacity of 3DP-ECC by 39% and 30%, respectively. The tensile performance is also enhanced by a moderate printing speed. In addition, a 141% increase in interfacial fiber bridging force is found with elevated nozzle standoff distance. Furthermore, the micro-structure observed via mu-CT correlates well with the printing parameters, micro-structure and macro-scale properties of 3DP-ECC.
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页数：12
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