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Interlayer reinforcement of 3D printed concrete by the in-process deposition of U-nails

journal contribution
posted on 16.08.2021, 13:10 by Li Wang, Guowei Ma, Tianhao Liu, Richard BuswellRichard Buswell, Zhijian Li
3D 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 Research

Volume

148

Publisher

Elsevier

Version

VoR (Version of Record)

Rights holder

© Elsevier

Publisher 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.2021.106535

Acceptance date

09/07/2021

Publication date

2021-07-23

Copyright date

2021

ISSN

0008-8846

Language

en

Depositor

Prof Richard Buswell. Deposit date: 16 August 2021

Article number

106535