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Interlayer reinforcement of 3D printed concrete by the in-process deposition of U-nails
journal contribution
posted on 2021-08-16, 13:10 authored by Li Wang, Guowei Ma, Tianhao Liu, Richard BuswellRichard Buswell, Zhijian Li3D concrete printing has tremendous potential for construction manufacturing; however, weak interface bonding between adjacent layers remains a well-known issue that affects the mechanical properties of printed structures. The layers introduce anisotropy and reduce the capacity to resist tensile and shear loads. Reinforcements, inserted perpendicular to the printed layers to traverse the interfaces, can improve these limitations, but the insertion of reinforcements is difficult to achieve in practice, and there are few published studies exploring appropriate methods. This study presents a promising approach using U-shaped nails inserted into concrete during the printing process. The bridging effect and dowel action of the applied U-nails are visualised and analysed to elucidate the toughness improvement. The ultimate tensile strength and shear strength of 3D printed concrete are significantly increased by 145.0% and 220.0%, respectively. U-nails with a filament thickness of 2–2.5 mm are recommended to yield optimal improvement in the interlayer strength.
Funding
National Natural Science Foundation of China (Nos. 5191102015, and 51808183)
Natural Science Foundation of Tianjin (Nos. 18JCZDJC39300, and 20JCYBJC00710)
Natural Science Foundation of Hebei (No. E2019202484)
History
School
- Architecture, Building and Civil Engineering
Published in
Cement and Concrete ResearchVolume
148Publisher
ElsevierVersion
- VoR (Version of Record)
Rights holder
© ElsevierPublisher statement
This paper was accepted for publication in the journal Cement and Concrete Research and the definitive published version is available at https://doi.org/10.1016/j.cemconres.2021.106535Acceptance date
2021-07-09Publication date
2021-07-23Copyright date
2021ISSN
0008-8846Publisher version
Language
- en