Microsilica Powder
Description
Description: Microsilica Powder
Microsilica powder is a gray powder that contains about 94-96% of silicon dioxide (sio2), which is obtained from the production stages of ferrosilicon in electric arc furnaces and to improve some properties of concrete during production and construction. , is added to concrete. In this way, by adding this material, the structure of the cement paste will be compressed and the permeability will decrease and the resistance will increase.
Features and benefits:
- Increasing compressive, tensile and bending strength of concrete
- Increasing the erosion resistance of concrete
- Increasing the electrical properties of concrete, preventing corrosion of reinforcements
- Increasing durability and reliability of concrete
Application:
- Making concretes with high compressive strength
- Production of strong concrete with high mechanical properties
- Suitable for producing dense and impermeable concrete
- Suitable for use in all structural elements
Technical specification table:
| State | Pozzolan powder |
| Color | Light or dark gray |
| Specific weight | 3% gr/cm3 |
| Standard | SSIRI 13278 – ASTM C1240 |
| Shape of spherical | Non-crystalline particles |
Packing :
20 to 40 kg bag
Janbo 300 to 500 kilos
Product Description – Micro Silica Powder (Silica Soot)
Among the prominent reasons for concrete permeability, we can mention the fine and microscopic discontinuities between concrete aggregates, which are caused by the lack of filler and fine grains. Microsilica powder is a gray powder containing about 94-96% silicon dioxide (SiO2), which is obtained from the ferrosilicon production process in electric arc furnaces and is added to concrete to improve some of the properties of concrete during production and construction. In this way, by adding this material, the structure of the cement paste is compacted, permeability will decrease and strength will increase. Another reason for concrete permeability is the formation of capillary tubes after water evaporation during the hydration process. Silica fume or microsilica powder is a suitable additive for filling these empty spaces. Because silica fume particles are much smaller than cement grains and fill very small microscopic spaces well. Also, using this product has the ability to protect concrete against chemical attacks.
Silica fume is a very fine powder that is used as a pozzolanic material in concrete with high efficiency. Microsilica powder ( microsilica gel ) improves the durability of concrete and can reduce the separation of components and particles. Silica fume plays an important role in increasing the properties of building materials. It also significantly increases the durability of concrete by reducing permeability.
Micro silica powder packaging
10 to 40 kg bag
300 to 500 kg jumbo
Consumption of micro silica powder
The amount of microsilica powder used depends on the degree of improvement in the desired properties of the concrete, and is recommended to be 7 to 12 percent of the weight of the cement used. Note that the amount of cement used can be reduced by the amount of silica fume added. Adding silica fume alone is not recommended due to its fine grain and easy dispersion in space, and due to its water absorption properties, it is better to use concrete lubricants together to prevent cracking, reduced efficiency, and lack of compaction of the concrete.
Micro silica powder storage
Duration: Three years in original packaging.
Conditions: Away from cold and frost, heat and direct and prolonged sunlight.
Best storage temperature: +10 to +30 degrees
How to use micro silica powder
Silica fume can be added to the mixture in one of the following ways:
1 – The best method of application is to mix microsilica powder with a portion of the mixing water and a certain amount of concrete lubricant, mix and disperse thoroughly with a high-speed mixer, and then add it to the concrete.
2 – Microsilica powder can be combined with a portion of the mixing water, made into a slurry, and then added to the mixture.
3 – Silica fume can be added to dry ingredients when making concrete.
Properties and effects of micro silica powder
- Preventing corrosion of reinforcements
- Increasing the compressive, tensile and flexural strength of concrete
- Increasing the electrical properties of concrete
- Reducing the alkaline reaction potential of aggregates
- Increasing the erosion resistance of concrete
- Reducing the amount of cement consumed
- Increasing the fluidity and ease of concrete placement
- Protecting concrete from chemical attacks
- Increasing the strength and durability of concrete
- Preventing the possibility of developing cervical cancer
- Increasing cohesion and reducing permeability of concrete
- Increasing the density of concrete mass
Applications of micro silica powder
- Suitable for producing dense and impermeable concrete
- Making concrete with high compressive strength
- Production of strong concrete with high mechanical properties
- Applicable in concreting road and water transmission tunnels
- Suitable for use in all structural elements
- Suitable for implementing all water structures such as: pools, tanks, treatment plants, etc.
- Suitable for concreting bridge piers and decks
Table of physical and chemical properties of micro silica powder
| Title | Feature |
| Mode | Pozzolan powder |
| Color | Light or dark gray |
| Specific gravity | 0.03g/cm3 |
| Particle shape | Spherical and non-crystalline |
| Particle size | 0.2 to 0.3 microns |
Mechanism of action of micro silica powder
By adding silica fume to the concrete mix, the active SiO2 in the silica fume mixes with the free calcium hydroxide solution Ca(OH)2 in the capillary and microscopic pores of the concrete, producing insoluble calcium silicate crystals, which ultimately increases the density of the concrete, reduces its permeability, and enhances some of the properties of the concrete.
Safety of micro silica powder
- If you inhale silica fume powder, drink plenty of milk.
- Be sure to wear a special mask when working with microsilica powder to prevent silica fume from entering the respiratory tract.
- Wear gloves and protective glasses when using.
- This material is not toxic or hazardous to the environment.
Micro silica powder standard
ASTM C1240 – SSIRI 13278 standard
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