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Microsilica
What is microsilica
Microsilica (silica dust) is a byproduct of the manufacturing process of ferroalloys such as metallic silicon and ferrosilicon. It consists of silicon dioxide granules with a diameter of 0.1-0.2 µm, which are 100 times smaller than cement particles. Microsilica is an amorphous material with strong pozzolanic properties.
Silica dust increases the mechanical properties of concrete, such as compressive, flexural and tensile strength, as well as adhesion to aggregate and reinforcement. It also affects the modulus of elasticity and reduces concrete creep. Microsilica increases the strength and durability of concrete, improving resistance to frost and chemical compounds.
Application of microsilica
Microsilica is used as an additive in the production of, among other things:
- Architectural concretes
- Refractory concretes
- GRC Concretes
- Mortars and plasters
- Adhesives and sealants
- Ready-mixed high-strength concrete
- Concrete products such as slabs, 3D panels, flower pots
- Refractory materials
Advantages of using microsilica in construction
Increases the durability of concrete
Microsilica fills the spaces between the particles of cement and aggregates, which increases the strength of concrete. Its durability is due to its compact structure with low porosity and the properties of hydration products (predominance of amorphous C-S-H phase at the expense of reduced calcium hydroxide content).
Reduces the permeability of concrete
Reducing the permeability coefficient of concrete below the limit of 10-14 m/s by adding microsilica at a level of up to 20% by weight of the binder, in the absence of fluxing agents - are confirmation of the beneficial effect of silica dust on increasing the durability of concrete.
Increases resistance to chemical aggression
Silica dust significantly increases the resistance of concrete to attack by the aggressive water abundant in sulphates Concretes have increased resistance to chemical corrosion, and their durability results from a combination of relatively lower content of calcium hydroxide and the packed, tight structure.
Effectively protects the reinforcement
Microsilica improves corrosion protection of the reinforcement, increases the resistance of the finished concrete product to water penetration, and promotes strength increase through secondary pozzolanic reaction. It also enhances creep and shrinkage in the concrete mix.
Increases frost resistance
With a low water-binder ratio in concrete (0.25-0.30) and with the replacement of 5-10% of cement with silica dust, an increase in frost resistance is observed.
Reduces abrasiveness
Microsilica causes less abrasion in concretes, which gives an increase in the hardness of the compact joint matrix, as well as the adhesion of grout to aggregate. Concrete with silica dust is also more resistant to erosion.
Unconsolidated microsilica
It is an amorphous light gray silicon oxide powder obtained by filtering dust extracted from silicon and ferrosilicon production in an electric arc furnace.
Application:
- High and ultra-high strength concretes
- Torkret
- Mortars and grouts
- Mortars and plasters
- Drilling cement
- Mixed elements
MIKROSILL compacted microsilica
It is a gray-colored silica dust formed as a byproduct of the production of ferrosilicon and silymetal in an electric arc furnace.
Application:
- High and ultra-high strength concretes
- Sprayed concrete
- Mortars and grouts
- Drilling cement
- Mixed cements
Compacted microsilica (F)
It is an amorphous light gray silicon oxide powder obtained by filtering dust extracted from silicon and ferrosilicon production in an electric arc furnace.
Application:
- High and ultra-high strength concretes
- Torkret
- Mortars and grouts
- Drilling cement
- Mixed elements
Mikrosilika Trade
Natalia Wianecka
ul. Kwiatkowskiego 1/223
37-450 Stalowa Wola
POLAND
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