Chen, M;
Li, J;
Zhang, T;
Zhang, M;
(2025)
3D printability of recycled steel fibre-reinforced ultra-high performance concrete.
Construction and Building Materials
, 462
, Article 139877. 10.1016/j.conbuildmat.2025.139877.
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Abstract
3D printing ultra-high performance concrete (UHPC) can be used for additive construction of structural components, which significantly reduces the reliance on steel reinforcement. This study investigates the effects of water-to-binder (w/b) ratios, recycled steel fibre (RSF) volume fraction and thickener content on the rheological behaviour, flowability, extrudability, buildability and shape retention ability of 3D printing RSF-reinforced UHPC. The results show that decreasing the w/b ratio, RSF incorporation and thickener incorporation increase the static and dynamic yield stress of the mixture. The dynamic yield stress of the mixture increases by 27.37 % when the volume fraction of RSF is increased from 1 % to 3 % at the same w/b ratio and thickener content. The addition of thickener increases the extrudability and buildability of 3D printing RSF-reinforced UHPC, which is mainly related to the adsorption of the thickener on the surface of the cementitious material particles and the introduction of bridging forces in the system of neighbouring cementitious material particles. The shape retention ability of 3D printing RSF-reinforced UHPC can be improved by increasing RSF volume fraction and thickener content. In addition, the mixture with a w/b ratio of 0.16, RSF volume fraction of 3 % and thickener content of 0.1 % shows the best printability.
| Type: | Article |
|---|---|
| Title: | 3D printability of recycled steel fibre-reinforced ultra-high performance concrete |
| DOI: | 10.1016/j.conbuildmat.2025.139877 |
| Publisher version: | https://doi.org/10.1016/j.conbuildmat.2025.139877 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10204922 |
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