Rheology, Early Hydration Heat and Strength of Cement-based Materials Mixed with Steel Slag Powder and Silica Fume

MA Chao; YAO Zhao-long; YANG Zhao; WANG Xin-long; JIANG Dao-dong

doi:10.11988/ckyyb.20221695

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (6) : 164-170. DOI: 10.11988/ckyyb.20221695

Hydraulic Structure and Material

Rheology, Early Hydration Heat and Strength of Cement-based Materials Mixed with Steel Slag Powder and Silica Fume

MA Chao^1,2,3, YAO Zhao-long¹, YANG Zhao^1,2,3, WANG Xin-long¹, JIANG Dao-dong^1,2,3

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Abstract

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 composite 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-distance 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.

Key words

steel slag powder / silica fume / rheology / early hydration heat / strength / water absorption

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MA Chao, YAO Zhao-long, YANG Zhao, WANG Xin-long, JIANG Dao-dong. Rheology, Early Hydration Heat and Strength of Cement-based Materials Mixed with Steel Slag Powder and Silica Fume[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(6): 164-170 https://doi.org/10.11988/ckyyb.20221695

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