We are leading manufacturer of Microsilica
Micro silica is also known as silica. The smoke is amorphous fine silica. It is a byproduct of the industrial manufacture of ferrosilicon and metallic silicon in high-temperature electric arc furnaces. Micro silica particles are less than 1 micron (0.00004 inches) in diameter, usually 50 to 100 times thinner than average cement or fly ash particles. The ferrosilicon or silicon product is extracted as a liquid from the bottom of the furnace. The steam that rises from the furnace bed at 2000 degrees C is oxidized and, as it cools, it condenses and becomes particles trapped in huge cloth bags. The processing of condensed smoke to remove impurities and control particle size produces micro-silica. Added to concrete at around 30kg / m3, the rheology changes and reacts with cement hydration products to dramatically improve concrete strengths, durability and impermeability, allowing concrete to be used in ways never before possible.
Advantages and Characteristics:
Why use Microsilica as concrete:
- Greater resistance: faster construction, better design, reduced volume. The addition of micro silica to a concrete mix alters the structure of the cement paste. The resulting paste contains more of the strong calcium-silicate hydrates and less of the weak and easily soluble calcium hydroxides than the common cement pastes. Because the micro silica particles are so small, the cement particles are dispersed and separated. The resulting fine and uniform matrix can provide a markedly higher resistance to compression, flexure and bonding.
- Reduced permeability: more durable, less possibility of gaseous escape, less attack of chemical products.
Microsilica concrete at the Civaux ll nuclear power plant, Poitiers, France
- Reduced cement content – use of SCMs.
- Reduced heat – less cracking.
- Greater lifetime – less repairs, greater security
- Better economics and a safer construction.
Process Flow Diagram & Technical Data Sheet: