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Cement grinding aid is a chemical additive added during the grinding process of cement materials that can significantly improve the grinding efficiency or reduce energy consumption without damaging the performance of the cement.

Silica fume (also known as "microsilica"), is amorphous and powdery silicon dioxide (SiO₂) collected by specially designed dust collectors after the oxidation of silicon vapor discharged through the flue during the smelting of ferrosilicon and industrial silicon. The average particle size of silica fume is between 0.1μm and 0.15μm, which is a few hundredths of the average particle size of cement. Its specific surface area is 15 - 27 m²/g, and it has extremely strong surface activity.