Bonding strength of steel rebars perpendicular to the hardened 3D-printed concrete layers

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URI: https://hdl.handle.net/11556/3754
ISSN: 0950-0618
DOI: 10.1016/j.conbuildmat.2022.127827
Publication date
2022-07-18
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Abstract
Passive rebars are inserted into interior hollow channels within a 3D-printed mortar geometry and then bonded with a wet joint of filling mortar, in order to test the bonding strength of the rebars within the mortar structure. Standardized test procedures are adapted for the test procedure. The test results revealed bonding strengths with shear stresses within an interval between 16.75 MPa and 18 MPa, dependent upon rebar diameter, and good early strength development of the bonding mortar of at least 14 MPa during the first week. No specimen failed because of debonding between the filling mortar and the 3D-printed cylinder, nor because of debonding of the cylinder and the concrete poured around its exterior.
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Publisher Copyright: © 2022 Elsevier Ltd
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3D concrete printing , Additive manufacturing , Bonding strength , Pull-out test , Reinforcement , Civil and Structural Engineering , Building and Construction , General Materials Science , SDG 9 - Industry, Innovation, and Infrastructure
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journal article
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Aramburu , A , Calderon-Uriszar-Aldaca , I & Puente , I 2022 , ' Bonding strength of steel rebars perpendicular to the hardened 3D-printed concrete layers ' , Construction and Building Materials , vol. 340 , 127827 . https://doi.org/10.1016/j.conbuildmat.2022.127827