Table 1.

D₅₀ particle size and specific surface of raw materials.

Material	Particle Size D50		Specific Surface Area (m2/g)
Silica sand (0.7 mm)	0.750	mm	-
Cement (type I–52.5R)	9.630	µm	1.31
Metakaolin (Metamax)	3.240	µm	12.56
Silica fume (Norway SF)	2.820	µm	21.59
Nano silica (Aerosil OX-50)	0.040	µm	50 ± 15
Nano silica (Aerosil 200)	0.012	µm	200 ± 25