Silica Fume - Micro Silica
Silica Fume – Is a high performance pozzolan with unique chemical and physical properties that enable cement based systems and mix designs to achieve higher levels of performance and durability. Silica Fume allows engineers and specifiers to meet and exceed design and performance criteria.
Silica Fume will greatly increase concrete strength and reduce permeability which in turn contributes to increased durability for chemical resistance, chloride attack, sulfate attack, and abrasion resistance. Increased cohesion using Silica Fume aids in Self Consolidating Concrete and Shotcrete applications.
Micro Silica (Silica Fume)
Approx. Rs 16 / KgGet Latest Price
Product BrochureProduct Details:| Minimum Order Quantity | 1000 Kg |
| Grade | ABOVE 90 % |
| Packaging Size | 25 KG |
| Color | Gray |
| State | Powdered |
| Packaging Type | BAG |
| Brand | OEM |
Silica fume, also known as micro silica is an amorphous (non-crystalline) polymorph of silicon dioxide, silica. It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production and consists of spherical particles with an average particle diameter of 150 nm. The main field of application is as pozzolanic material for high performance concrete.
Technical Specifications:
- SiO2 – Silica : >90%
- Humidity : <2%
- Particle size (microns) : <25
- Color : Grey
- Loss on ignition at 800°C : <4%
- pH value : 8.0
Application
Because of its extreme fineness and high silica content, silica fume is a very effective pozzolanic material. Standard specifications for silica fume used in cementitious mixtures are ASTM C1240,[8] EN 13263.[9]
Silica fume is added to cement concrete to improve its properties, in particular its compressive strength, bond strength, and abrasion resistance. These improvements stem from both the mechanical improvements resulting from addition of a very fine powder to the cement paste mix as well as from the pozzolanic reactions between the silica fume and free calcium hydroxide in the paste.
Addition of silica fume also reduces the permeability of concrete to chloride ions, which protects the reinforcing steel of concrete from corrosion, especially in chloride-rich environments such as coastal regions and those of humid continental roadways and runways (because of the use of deicing salts) and saltwater bridges.
Effects of silica fume on different properties of fresh and hardened concrete include
a) Workability: With the addition of silica fume, the slump loss with time is directly proportional to increase in the silica fume content due to the introduction of large surface area in the concrete mix by its addition. Although the slump decreases, the mix remains highly cohesive.
b) Segregation and bleeding: Silica fume reduces bleeding significantly because the free water is consumed in wetting of the large surface area of the silica fume and hence the free water left in the mix for bleeding also decreases. Silica fume also blocks the pores in the fresh concrete so water within the concrete is not allowed to come to the surface.
Application Areas:
- High performance concrete
- High strength, low permeability concrete
- Concrete in marine environments
- Industrial flooring
- Water tanks and sumps
- Chemical storage tanks
- Basements and sewerage pipelines
- Refractory mixes etc.
- Petroleum Referineries
- Tunnels
Additional Information:
- Pay Mode Terms: L/C (Letter of Credit),T/T (Bank Transfer),D/P,D/A
- Port of Dispatch: All Indian Port
- Delivery Time: EX-STOCK
- Packaging Details: Silica Fume is avalible in 25 kg and 1 Tone Jumbo Bag Packing.
Elkem Microsilica 920 NA
Product Price :Get Latest Price
Product BrochureProduct Details:| Grade | 920NA |
| Material | SILICA FUME |
| Packaging Size | 25 KG |
| Color | Gray |
| State | Powdered |
| Packaging Type | BAG |
| Brand | Elkem |
| SiO2 | Minimum 85.0 % |
| H2O | Maximum 3.0 |
Description: Elkem Microsilica® 920 NA is a dry silica fume powder. In use, Elkem Microsilica® 920 NA improves the performance of concrete and mortar formulations. It acts physically to optimise particle packing of the concrete or mortar mixture and chemically as a highly reactive pozzolan.
Elkem Microsilica® 920 NA is available in two forms: Undensified (U) and Densified (D)
Applications:Batch the product into the concrete mixer and mix thoroughly ensuring full dispersion. Dosage varies depending on application. Contact Elkem for information and advice.
Chemical & physical data:
|
Property |
Unit |
Value |
|
SiO2 |
% |
Minimum 85.0 |
|
H2O |
% |
Maximum 3.0 |
|
Retained on 45µm sieve |
% |
Maximum 10.00 |
|
+ 45µm variation from average |
|
Maximum 5.0 |
|
Loss on ignition |
|
Maximum 6.0 |
|
Specific surface area |
m2 /g |
Minimum 15.0 |
|
Pozzolanic activity index* |
% |
Minimum 105 |
|
Bulk density U |
kg/m3 |
200 - 350 |
|
Bulk density D |
kg/m |
500 - 700 |
Elkem Microsilica 920 EN
Product Price :Get Latest Price
Product BrochureProduct Details:| Grade | 920D |
| Material | SIO2 |
| Packaging Size | 25 KG |
| Color | Gray |
| State | Powdered |
| Packaging Type | BAG |
| Brand | Elkem |
| SiO2 | Minimum 85.0 % |
Description:
Elkem Microsilica® 920 EN is a dry silica fume powder certified to EN 13263 ‘Silica fume for concrete’. In use, Elkem Microsilica® 920 EN improves the performance of concrete and mortar formulations.
It acts physically to optimise particle packing of the concrete or mortar mixture and chemically as a highly reactive pozzolan.
Elkem Microsilica® 920 EN is available in two forms: Undensified (920 EN U), with a typical bulk density of 200 to 350 kg/m3 and Densified (920 EN D), with a typical bulk density of 500 to 700 kg/m3 .
Applications: Batch the product into the concrete mixer and mix thoroughly ensuring full dispersion. Dosage varies depending on application. Contact Elkem for information and advice.
Chemical & physical data:
|
Property |
Unit |
Value |
|
SiO2 |
% |
Minimum 85.0 |
|
SO3 % |
% |
Maximum 2.0 |
|
Cl |
% |
Maximum 0.3 |
|
Free CaO |
% |
Maximum 1.0 |
|
Free Si |
% |
Maximum 0.4 |
|
Loss on ignition |
% |
Maximum 4.0 |
|
Specific surface area |
m2 /g |
Minimum15.0 and Maximum 35.0 |
|
Pozzolanic activity index |
% |
Minimum 100 |
Packaging: The product is available in 25 kg bags, various other size bags and bulk road tanker. Please contact our representative for more details.
Storage and handling: Elkem Microsilica® 920 EN should be stored in dry conditions and not exposed to moisture
Additional Information:
- Item Code: ElkemMicrosilica920
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