Effect of CaO Activator on the Activity of Ferrous Extraction Tailing of Nickel Slag-Cementitious System
FENG Qiong1,2,*, SUN Xiaoxia1,2, QIAO Hongxia1,2, SONG Yanning1,2, WEI Chao1,2
1 School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Gansu Province Engineering Research Center for Advanced Civil Engineering Materials, Lanzhou 730050, China
Abstract: To address the bottleneck issue of low cementitious activity in ferrous extraction tailing of nickel slag that restricts their resource utilization, this work incorporates CaO as an activator to regulate the hydration process of a ferrous extraction tailing of nickel slag-cement composite cementitious system. By using a combination of micro- and macro-scale testing methods, the activation mechanism of CaO in enhancing the system’s reactivity was systematically investigated, with the aim of enhancing the utilization efficiency of ferrous extraction tailing of nickel slag in cement-based materials. The experimental results demonstrate that the addition of CaO significantly promotes the hydration process of the ferrous extraction tailing of nickel slag-cement composite system. At the micro-level, CaO effectively stimulates the formation of C-S-H gel and ettringite;these hydration products fill the pore structure of the material, resulting in a denser microstructure. In terms of macroscopic properties, CaO accelerates the early-age hydration, resulting in a remarkable improvement in the mechanical performance of the composite cementitious system, with the 3-day and 28-day compressive strength increasing by an average of 16.46% and 15.41%, respectively. This research provides a theoretical basis and technical support for the efficient utilization of iron-extracted nickel slag tailings in cement-based materials.
冯琼, 孙晓霞, 乔宏霞, 宋彦宁, 魏超. CaO激发剂对镍渣提铁尾渣-水泥胶凝体系活性的影响[J]. 材料导报, 2026, 40(17): 25080139-7.
FENG Qiong, SUN Xiaoxia, QIAO Hongxia, SONG Yanning, WEI Chao. Effect of CaO Activator on the Activity of Ferrous Extraction Tailing of Nickel Slag-Cementitious System. Materials Reports, 2026, 40(17): 25080139-7.
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2026, Vol. 40 
