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This study investigates the feasibility of using steel slag (SS) as fine aggregate for 3DCP. Ninety mixtures with varying steel slag aggregate-to-cement ratios (SA\/C), water-to-cement ratios (W\/C), and silica fume (SF) contents were designed to study the workability and compressive strength of the 3D-printed concrete. Additionally, the actual components were printed to evaluate the printability of these mixtures. The experimental results indicate that it is feasible to fully employ SA in concrete for 3D printing. Mixtures with slump values ranging from 40 to 80\u00a0mm and slump flow values varying from 190 to 210\u00a0mm are recommended for 3D printing. The optimal mix is determined to have SA\/C and W\/C ratios of 1.0 and 0.51, respectively, and an SF content of 10% by cement weight. A statistical approach was utilized to construct the prediction models for slump and slump flow. Moreover, to predict the plastic failure of the 3D-printed concrete structure, the modified prediction model with an SA roughness coefficient of 4 was found to fit well with the experimental data. This research provides new insights into using eco-friendly materials for 3D concrete printing.<\/jats:p>","DOI":"10.1186\/s40069-024-00705-9","type":"journal-article","created":{"date-parts":[[2024,9,21]],"date-time":"2024-09-21T23:01:44Z","timestamp":1726959704000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Eco-Friendly 3D-Printed Concrete Using Steel Slag Aggregate: Buildability, Printability and Mechanical Properties"],"prefix":"10.1186","volume":"18","author":[{"given":"Nhi","family":"Tran","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2581-031X","authenticated-orcid":false,"given":"Mien","family":"Van Tran","sequence":"additional","affiliation":[]},{"given":"Phuong","family":"Tran","sequence":"additional","affiliation":[]},{"given":"An Khanh","family":"Nguyen","sequence":"additional","affiliation":[]},{"given":"Cuong Quoc","family":"Nguyen","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2024,9,22]]},"reference":[{"issue":"3","key":"705_CR1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.3390\/su13031568","volume":"13","author":"MI \u00c1lvarez-Fern\u00e1ndez","year":"2021","unstructured":"\u00c1lvarez-Fern\u00e1ndez, M. 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