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http://hdl.handle.net/10397/111997
Title: | Development of sustainable strain-hardening cementitious composites containing diatomite for 3D printing | Authors: | Teng, F Xu, F Yang, M Yu, J Zhang, D Weng, Y |
Issue Date: | 1-Jun-2025 | Source: | Journal of building engineering, 1 June 2025, v. 103, 112170 | Abstract: | 3D concrete printing (3DCP) faces challenges in the automated integration of reinforcement. The use of strain-hardening cementitious composites (SHCCs) with high ductility offers a promising solution to this issue. However, the high cement content in printable SHCC increases the carbon footprint, contributing to heavy environmental burden. This study investigates using diatomite (DE), a natural sedimentary rock, to develop sustainable SHCC for 3DCP. Diatomite partially replaces ordinary Portland cement, and the effects of various DE replacement ratios (10 %, 20 %, 30 %) on fresh properties, mechanical properties, hydration, and microstructure are experimentally examined. Sustainability analysis is conducted using life cycle assessment (LCA). Results show that a 30 % DE replacement ratio increases the dynamic yield stress, static yield stress, and plastic viscosity by 31.7 %, 79.7 %, and 239.5 %, respectively. A 10 % DE replacement achieves the highest mechanical properties, with tensile, compressive, and flexural strengths increased by 54.6 %, 14.0 %, and 27.4 %, respectively, compared to the reference group. A 10 % DE replacement ratio enhances the hydration process with increased calcium silicate hydrate gels formation and refines the microstructure. DE replacement ratio above 20 % negatively impacts hydration due to insufficient portlandite, while the porous structure of unhydrated DE increases the total porosity by 18.4 %. LCA results show a 25.8 % reduction in global warming potential can be achieved. The findings reveal that the developed DE-SHCC has the potential to facilitate sustainability and enhance the mechanical properties in construction 3D printing. | Keywords: | 3D concrete printing Diatomite Mechanical properties Strain-hardening cementitious composites Sustainability |
Publisher: | Elsevier | Journal: | Journal of building engineering | EISSN: | 2352-7102 | DOI: | 10.1016/j.jobe.2025.112170 | Rights: | © 2025 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). The following publication Teng, F., Xu, F., Yang, M., Yu, J., Zhang, D., & Weng, Y. (2025). Development of Sustainable Strain-hardening Cementitious Composites Containing Diatomite for 3D Printing. Journal of Building Engineering, 103, 112170 is available at 10.1016/j.jobe.2025.112170. |
Appears in Collections: | Journal/Magazine Article |
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