for Concrete Products
Concrete Properties Containing Silica Fume
Silica Fume reacts with lime during cement hydration to form additional calcium silicate hydrates (C-S-H gel) which bond the components together creating a dense matrix.
Silica Fume 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 improves component packing and adhesion, which directly impacts the mechanical properties, especially on strength.
Porosity/ Permeability/ Resistance to Corrosion
The addition of Silica Fume reduces porosity by decreasing pore size. Porosity and permeability reductions inhibit the penetration of aggressive agents. The use of Silica Fume is beneficial to prevent concrete from corrosion in difficult environments: harbors, airports, chemical areas, and coastal buildings are common examples.
Silica Fume 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.
Silica Fume reduces concrete permeability. A reduction in chloride and sulfate ingress has shown to significantly slows down irreversible degradation.
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High Performance Concrete
Silica Fume is widely used in concrete and fiber cement industries. In addition to its pozzolanic properties, it is also a very good filler due to its particle size. These combined properties lead to an extended life expectancy in corrosive environments (resistance to chlorides, acids, and sulphates) and improved strength.
High-Performance Concrete containing silica fume is one of the more important advanced materials necessary to rebuild our nation's infrastructure. Silica fume delivers increased toughness and resistance to abrasion and corrosion, improving sustainability and life-cycle cost efficiency.
Some examples of Silica Fume include use for highway bridges, parking decks, marine structures, and bridge deck overlays, and other applications typically subject to deterioration caused by corrosion, abrasion, and chemical degradation. Silica fume improves concrete protection against deicing salts, seawater, traffic, and heavy impact, and other destructive environments.