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What is Silica Fume

Updated: Feb 23, 2021

Silica Fume originates from the oxidation of the SiO gas produced during the fabrication of Silicon, Ferrosilicon alloys and CaSi alloys in electric furnaces. The SiO2 formed is then condensed into spherical particles and recovered in bag house filters.

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Pozzolanic Reaction

Silica Fume Concrete reacts with lime during cement hydration to form additional calcium silicate hydrates (C-S-H gel) which bonds the components together creating a dense matrix.

Filler Effect

Silica Fume Concrete is 100 to 150 times smaller than a cement particle and can fill the interstitial voids. The packing effect reduces strongly the concretes porosity and permeability.


Silica Fume Concrete improves component packing and adhesion, which has a direct impact on the mechanical properties, especially on strength.

Porosity/ Permeability/ Resistance to Corrosion

Addition of Silica Fume Concrete reduces porosity by decreasing pore size. Porosity and permeability reductions inhibit the penetration of aggressive agents. The use of Silica Fume Concrete is beneficial to prevent concrete from corrosion in difficult environments: harbors, airports, chemical areas, and coastal buildings are common examples.

Alkali Reaction

Silica Fume Concrete protects the concrete against the alkali reaction. Its fine and amorphous particles react with cement alkalies and reduce their content in the concrete before hardening.


By reducing concrete permeability, Silica Fume Concrete reduces water movements and internal pressures leading to irreversible degradation.

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