Use of silica fume in concrete - Decarbonizing cement industry Innovation Insights - CLIMAX
Silica fume is a byproduct of producing silicon metal or ferrosilicon alloys. One of the most beneficial uses for silica fume is in concrete. It consists primarily of amorphous (non-crystalline) silicon dioxide (SiO2). The individual particles are extremely small, approximately 1/100th the size of an average cement particle.
Because of its fine particles, large surface area, and the high SiO2 content, silica fume is a very reactive pozzolan when used in concrete. The quality of silica fumes is specified by ASTM C 1240 and AASHTO M 307.
Concrete containing silica fumes can have very high compressive strength, in excess of 15,000 psi and can be very durable.
Source: National Precast Concrete Association
Source: Jamia Millia Islamia University, India
Core sciences & engineering