Evaluation on the effects of Cu(II) on the properties of blast furnace slag–cement composites with adding Cu-bearing solid wastes
Zhang Q. Liu B. An C. Li Q. Liu J. Wei S. Fan J. Sun Z. Zhang D. Pulatov B.
December 2025University of Science and Technology Beijing
International Journal of Minerals, Metallurgy and Materials
2025#32Issue 123072 - 3085 pp.
The effect of heavy metals on the properties and hydration of blast furnace slag–cement composites (BFS-CC) remain unclear. In this study, two BFS-CC (denoted as DBFS-CC and WBFS-CC) were prepared by dry and wet grinding of BFS, respectively. The effect of Cu(II) on BFS-CC’s properties and hydration was investigated by adding representative copper contaminants (CuO, CuCl2, and CuS) to the composites. Adding 1.0wt% CuO and 0.5wt% CuS increased the 3-d compressive strength of DBFS-CC by 14.9% and 5.7%, respectively, but suppressed the 3-d strength of WBFS-CC. This trend reversed at 28-d curing, where adding 1.5wt% CuO, 2.0wt% CuCl2, and 1.5wt% CuS enhanced the compressive strength of WBFS-CC by 23.4%, 6.2%, and 13.6%, respectively, but adversely affected the strength of DBFS-CC. For 28-d hydration, adding CuCl2 decreased the hydration degree of DBFS-CC but enhanced that of WBFS-CC. Adding CuO promoted the hydration degree of both composites, while adding CuS exhibited inhibitory effects. DBFS-CC immobilized CuCl2 better due to a higher hydration degree, while WBFS-CC immobilized CuO and CuS better due to having finer unhydrated BFS particles and a denser matrix. This study not only focuses on the Cu(II) immobilization effect but also reveals the differential effects of Cu(II) species on the hydration process, providing novel insights into heavy metal interactions in BFS-CC systems and their safe disposal.
blast furnace slag–cement composites , copper contaminants , hydration process , immobilization process , mechanical properties
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Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Xinjiang Research Institute for Nonferrous Metals Co., Ltd., Urumqi, 830009, China
Department of Civil and Environmental Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana, 010000, Kazakhstan
Research Institute of Environment and Nature Conservation Technologies, Tashkent, 100043, Uzbekistan
Institute for Advanced Materials and Technology
Xinjiang Research Institute for Nonferrous Metals Co.
Department of Civil and Environmental Engineering
Research Institute of Environment and Nature Conservation Technologies
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