Two-step approach to manufacture sustainable artificial steel slag aggregate used in alkali-activated concrete
Article
Kong, Jiafeng, Wang, Shu, Wu, Wenhao, Li, Yujiao, Chen, Mingxu, Zhou, Xiaolong, Zhang, Zuhua and Quan, Hongzhu. 2024. "Two-step approach to manufacture sustainable artificial steel slag aggregate used in alkali-activated concrete." Construction and Building Materials. 445. https://doi.org/10.1016/j.conbuildmat.2024.137850
Article Title | Two-step approach to manufacture sustainable artificial steel slag aggregate used in alkali-activated concrete |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Kong, Jiafeng, Wang, Shu, Wu, Wenhao, Li, Yujiao, Chen, Mingxu, Zhou, Xiaolong, Zhang, Zuhua and Quan, Hongzhu |
Journal Title | Construction and Building Materials |
Journal Citation | 445 |
Article Number | 137850 |
Year | 2024 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2024.137850 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S0950061824029921 |
Abstract | This study utilized 3 mol/L hydrochloric acid to activate steel slag powder in combination with carbonation and produced the artificial steel slag aggregate (ASSA) for the use in alkali-activated concrete. The composition, microstructure, and properties of the ASSA were investigated. The results indicated that acid activation enhanced the compressive strength of the ASSA by 26.7 %, reduced the total porosity by 5.2 %, and facilitated the formation of portlandite, C-S-H gel, and monocarbonate in the hydration products. Carbonation enhanced the compressive strength of the ASSA by 28.5 %, reduced the total porosity by 14.5 %, and led to the formation of calcite and aragonite. The effect of acid activation coupled with carbonation on the ASSA manifested in a 43.6 % enhancement in compressive strength, a 17.9 % reduction in porosity, and an expansion rate reduction to 1.2 %. The alkali-activated concrete produced with the modified ASSA exhibited enhanced compressive strength by up to 21 % compared with the control group, facilitated internal curing to balance internal humidity, and mitigated drying shrinkage deformation. This study provides a viable and secure approach to the reutilization of steel slag. |
Keywords | Acid activation; Steel slag; Carbonation; Artificial aggregate; Microstructure |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Qingdao Agricultural University, China |
Tongji University, China | |
Centre for Future Materials |
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