TY - JOUR
T1 - Synchronized concrete and bonding agent deposition system for interlayer bond strength enhancement in 3D concrete printing
AU - Weng, Yiwei
AU - Li, Mingyang
AU - Wong, Teck Neng
AU - Tan, Ming Jen
N1 - Funding Information:
The authors would like to acknowledge National Research Foundation, Prime Minister's Office, Singapore under its Medium-Sized Centre funding scheme, Singapore Centre for 3D Printing, CES_SDC Pte Ltd., and Chip Eng Seng Corporation Ltd. for their funding and support in this research project.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/3
Y1 - 2021/3
N2 - 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.
AB - 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.
KW - 3D concrete printing
KW - Additive manufacturing
KW - Bonding agent
KW - Interlayer bond strength
KW - Synchronized system
UR - http://www.scopus.com/inward/record.url?scp=85100219040&partnerID=8YFLogxK
U2 - 10.1016/j.autcon.2020.103546
DO - 10.1016/j.autcon.2020.103546
M3 - Journal article
AN - SCOPUS:85100219040
SN - 0926-5805
VL - 123
JO - Automation in Construction
JF - Automation in Construction
M1 - 103546
ER -