Silica fume, also known as microsilica, is widely used in the fields of concrete, refractory materials, ceramics and rubber. This material, a by-product of the manufacture of silicon metal or ferrosilicon alloy, is derived from the reduction of high-purity quartz (SiO2) with coal in an electric arc furnace. Silica fume is mainly composed of amorphous silicon dioxide (SiO2), and is characterized by extremely fine particles, about 1/100 the size of the average cement particle. Due to its remarkable chemical and physical properties, such as its high silica content and exceptional fineness, silica fume acts as a very effective pozzolanic material. Consequently, concrete containing silica fume can exhibit exceptional strength and durability. Microsilica fume, on the other hand, represents a finer particle compared to cement. It is produced by chemical processing of ash and is primarily used in high-strength concrete mixes (e.g., M50, M60 and higher grades). Its purpose is to fill small voids that cement alone cannot fill. It is worth noting that the surface area of ​​fine silica ranges from about 30,000 to 45,000 square meters/kg, which is a great contrast to the surface area of ​​cement, which is typically in the range of 350 to 600 square meters/kg.