What is Silica Fume? Why use it?

Silica fume as a veryfine non-crystalline silica produced in electric arc furnaces as a by product of production of elemental silicon or alloys containing silicon.Silica Fume is a high performance, densified silica fume powdered product.

Silica fume has been recognized as a pozzolanic admixture that is effective in enhancing the mechanical properties to a great extent.It is used in pre-mixed concrete for enhancing mechanical properties of concretes with special performance requirements, including increased strength, reduced permeability, improved abrasion resistance and increased corrosion resistance.

The addition of Silica Fume can provide:Increased compressive strength, Increased abrasion resistance, enhanced sulphate resistance, reduced chloride ion permeability, enhanced resistance to chemical attack and deterioration, Improved durability, Increased bond strength.

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Precast Concrete Box Culverts

• In refractory and ceramic applications silica fume is used for its’ ability to modified flow characteristics and for the unique particle packing ability.

• Silica-fume Shotcrete—delivers greater economy, greater time savings and more efficient use of sprayed concrete.

• Technically speaking these parameters include Sio2 content,specific surface area by BET,moisture content,loss on ignition,and the amount of several trace elements that may be present.

Mortars or grouts modified with silica fume can be tailored to perform in many different applications—overhead and vertical mortars benefit from silica fume’s ability to increase surface adhesion.

    Reduced Permeability
  • A high permeability concrete(left) allows water to move into and through the concrete readily.Lowering the W/cm and adding silica fume can reduce permeability to essentially zero.Such a reduction makes it very difficult for water and aggressive chemicals such as chlorides or sulfates to enter the concrete.

    • Chloride damage to reinforcing steel
  • corrosion of reinforcing steel is the most significant and costly cause of concrete deterioration. At the anode chloride ions interact with iron to produce Fe++ ions.The electons released flow through the reinforcing steel to the cathode.The electrical path is completed by OH-ions flowing through the pore solution(electrolyte).

Silica fume NR85


  • Most of them are light-colored microsilicon powder, which is widely used in grouting materials and cement precast products.To improve the strength and other physical and mechanical properties.

Silica fume NR90


  • It is widely used in the construction field, with good activity and large specific surface area.The use of beneficial to prevent concrete from corrosion in difficult environments

Silica fume NR92


  • To improve the strength and other physical and mechanical properties (compactness and permeability resistance) of concrete or mortar;

Silica fume NR95


  • To improve the strength and other physical and mechanical properties (compactness and permeability resistance) of concrete or mortar;