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Being an effective pozzolanic material, silica fume is commonly added to concrete to improve its properties, in particular bond strength, міцність на стиск, and corrosion resistance.
- Silica fume presents a neutral inorganic filler with incredibly stable chemical and physical properties. It does not participate in the curing reaction, does not contain crystalline water, and does not affect the reaction metabolism.
- Adding silica fume to concrete can increase thermal conductivity and flame retardant, as well as change adhesive viscosity.
- It has great adsorption performance, produces no agglomeration phenomenon, is easy to mix, and offers good infiltration for various types of resin.
- The addition of silica fume allows reducing epoxy resin’s exothermic peak temperature of curing reaction, the shrinkage rate of solidified products, and their linear expansion coefficient. This allows preventing cracking by eliminating internal stress.
Applications of Silica Fume in Concrete
Silica Fume Concrete Properties
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.
Сила
Silica Fume Concrete improves component packing and adhesion, which has a direct impact on the mechanical properties, especially on strength.
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.
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: гавані, airports, chemical areas, and coastal buildings are common examples.
Filler Effect
Silica Fume Concrete is 100 до 150 times smaller than a cement particle and can fill the interstitial voids. The packing effect reduces strongly the concretes porosity and permeability.
Freeze-Thaw
By reducing concrete permeability, Silica Fume Concrete reduces water movements and internal pressures leading to irreversible degradation.
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