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Abstract In order to achieve high-volume and high-value utilization of steel slag resources, this paper proposes an innovative strategy for preparing high-strength mortar by using steel slag as the main raw material, introducing a certain amount of silica fume and supplementing it with an appropriate amount of activator to activate the hydration activity of steel slag under humid heat curing. The study concluded that after introducing silica fume into the cementitious material system with a 60% steel slag admixture, high-performance steel slag cementitious mortar(SSCM)with a strength of over 70 MPa can be successfully prepared using humid heat curing. Compared with the traditional steel slag polymer cementitious system, the introduction of silica fume to replace part of the slag while maintaining the Ca/Si of the system can effectively reduce the amount of system accelerator, so that the compressive strength of the mortar changes slightly when the accelerator content is reduced from 17% to 11%. Under the conditions of humid heat curing, extending the curing time and using a low alkali accelerator with an amount of less than 10%, the strength of the SSCM can also be sustainably developed to a suitable strength for engineering applications. At the same time, the introduction of silica fume in SSCM can effectively reduce the drying shrinkage of the mortar and exhibit better durability. The mechanism of strength formation in the system is that the introduction of silica fume can effectively provide SiO2- 3 to the system to participate in the formation of C-S-H gel, and can continuously promote the formation of C-S-H gel, increase the density of the structure, and increase the mechanical properties of SSCM.
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Published: 30 October 2025
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2025, Vol. 0 
