Rheology,Early Hydration Heat and Strength of Cement-based Materials Mixed with Steel Slag Powder and Silica Fume
To address the challenge of steel slag disposal,characterized by large quantities and low utilization rates,we prepared a green,low-carbon cement-based material with optimized mechanical properties by substituting part of the cement with steel slag ground into micro-powder and combined with silica fume.We conducted experimental studies on the rheological behavior,early hydration exotherm,strength,and water absorption of the prepared com-posite cement-based material system at various proportions.Our key findings are as follows:1)Steel slag powder particles exhibits a less angular and flaky micro-morphology.When replacing 15％of the cement,steel slag powder effectively enhances matrix consistency,slightly reduces strength,and significantly decreases early hydration heat release by 8.8％,which is beneficial to the control of early temperature-induced cracking.2)Incorporating silica fume notably decreases the material's plastic viscosity and pumping pressure.For applications requiring long-dis-tance pumping,such as mass concrete or high-performance concrete,silica fume content should be limited to 5％.Additionally,silica fume's space-filling effect and pozzolanic reaction enhances the material's compactness and substantially improves strength.In summary,cement-based material incorporating 15％steel slag powder and 5％silica fume not only enhances pumping performance,strength,and durability but also mitigates early hydration heat release,demonstrating promising engineering applications.
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