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| Study on the Influence of Vertical Roller Mill Grinding Slag Powder Particle Size on the Mechanical Properties of Cement Mortar |
| LIU Chang, LI Yong
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CNBM Equipment Group, Hefei Zhongya Building Material Equipment Co., Ltd. , Hefei Anhui 230601, China
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Abstract This study analyzes the significant influence of slag powder particle size on the mechanical properties of cement mortar when used as a raw material in cement production. Slag powders of different fineness levels were prepared using a vertical roller mill grinding test system. The intrinsic relationship between the particle morphology of vertical mill-ground slag powder, particle size, and cement mortar strength was systematically investigated through laser particle size analysis, scanning electron microscopy, and grey correlation analysis. The results indicate that the particle group of vertical mill-ground slag powder exhibits more pronounced polydispersity. Particles in the 0~5μm range primarily enhance the 7d early strength of cement mortar, while particles in the 5~10μm range contribute most significantly to the 28d later strength. The particles in the 0~5μm and 5~10μm ranges exhibit the highest correlation with the 7d and 28d activity indices of slag powder (0.842 and 0.716, respectively). The study also found that the particle size uniformity of vertical mill-ground slag powder decreases as the particle size increases. However, optimizing the proportion of particles in the 0~20μm range can significantly improve the mechanical properties of cement mortar, providing a theoretical basis for process control in the production of high-performance slag powder using vertical roller mill systems.
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Received: 19 February 2025
Published: 22 September 2025
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