期刊
AUTOMATION IN CONSTRUCTION
卷 123, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.autcon.2020.103546
关键词
3D concrete printing; Additive manufacturing; Interlayer bond strength; Synchronized system; Bonding agent
资金
- National Research Foundation, Prime Minister's Office, Singapore
- Singapore Centre for 3D Printing
- CES_SDC Pte Ltd.
- Chip Eng Seng Corporation Ltd.
The proposed synchronized concrete and bonding agent deposition system addresses the weak interlayer bond strength issue in extrusion-based 3D concrete printing. By using cement paste as the bonding agent, a relative bond strength as high as 267% can be achieved through the system.
A synchronized concrete and bonding agent deposition system is proposed to address the weak interlayer bond strength issue in extrusion-based 3D concrete printing (3DCP). In the proposed system, printable concrete and bonding agent are deposited concurrently via a rotatable nozzle with two outlets. Therefore, the interlayer bond strength is improved by the bonding agent deposited on the interface between printed filaments. Various bonding agents, including water, cement strengthener, polymer solution, and cement paste, were investigated. The results indicate that when the cement paste with a 0.26 water-to-cement mass ratio is adopted as the bonding agent, a relative bond strength as high as 267% can be obtained via the proposed system. Continuous printing was conducted to demonstrate that the proposed system has great potential for practical engineering applications. The proposed system has the potential to eliminate the weakness in interlayer bond strength of 3DCP processes and to widen 3DCP applications.
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