The physical properties of silicon powder

The main quality indicators of silicon powder are its SiO content and fineness. SiO: The higher the content and finer the fineness, the better its modification effect on concrete. Due to different testing methods in different countries, their regulations on the main quality indicators of silicon powder are also different (1) Silicon powder is a very fine powder, mainly composed of amorphous silica with extremely fine particles (0.1-0.2 bucket meters). Its average particle size is 100 times smaller than cement, and its specific surface area is about 15-20m2/g (2) Because silicon is obtained by condensation from steam, its powder has a spherical shape

(3) This powder contains over 85% to 95% glassy active silica (4) The density of silicon powder is 2.2-2.59/cm3, and the bulk density is 200-300kg/in5 The effect of silicon powder added to concrete on newly mixed hardened concrete is related to the above characteristics. The physical properties of silica fume determine that the small particles of silica fume have a high degree of dispersion, which can be fully filled between cement particles to improve the compactness of the hardened slurry