RT Journal Article
T1 Wet joint performance of 3D printed concrete beam segments under flexural loading
A1 Aramburu, A.
A1 Calderon-Uriszar-Aldaca, I.
A1 Puente, I.
AB A segmented 3D-printed concrete (3DPC) beam is designed whose structural reliability depends on a rebar that can withstand tensile stress at the joints between segments under bending moments. In this study, a new approach is for the first time presented on rebar placement after concrete hardening. It details an innovative testing procedure of joint behavior and bonding strength through the use of 3DCP beam segments assembled to form T-shaped beams with an underside groove into which a rebar is inserted. The bonding strength of the rebar embedded in mortar within the semi-circular groove and the wet joints between segments are characterized and validated. Different variables are considered in the modularization of the 3DPC beam segments and bonding stresses between rebar and concrete are studied. To do so, the beam test procedure was adapted to 3DPC beam segments with 3 rebar diameters and 2 segment lengths subjected to 3-point and 4-point bending flexural tests. As a main finding, the results of this research indicated that both rebar and matrix, when properly designed, underwent bonding failure at loads above their theoretical ultimate limit design values, at the yield point of the rebar steel, demonstrating that placement of rebars after hardening of the 3DPC segments can therefore form a structurally reliable joint.
SN 2352-7102
YR 2023
FD 2023-08-15
LA eng
NO Aramburu , A , Calderon-Uriszar-Aldaca , I & Puente , I 2023 , ' Wet joint performance of 3D printed concrete beam segments under flexural loading ' , Journal of Building Engineering , vol. 73 , 106728 . https://doi.org/10.1016/j.jobe.2023.106728
NO Publisher Copyright: © 2023 Elsevier Ltd
NO The authors wish to thank the assistance received from the staff of the 3D-printing laboratory of Tecnalia, (especially A. Salvador, R. Castaño and J. Roncero), the students (especially, O. García and M. Kawka), and the laboratory technician (A. López) from Tecnun – University of Navarra for assisting with the university laboratory tests and measurements and documenting the test results, and the technical manager of Gallardo Engineering (A. Herrero) for the ideas that helped to focus this research. Financial support is also gratefully acknowledged, both from the SPRI research program funded by the Basque Government under project ERRAIL ZL-2020/00940 and ZL-2021/00181 and project NEOMAT KK-2021/00059. Financial support is also gratefully acknowledged, both from the SPRI research program funded by the Basque Government under project ERRAIL ZL-2020/00940 and ZL-2021/00181 and project NEOMAT KK-2021/00059 .
DS TECNALIA Publications
RD 28 sept 2024