Micro Silica
414 Solution offers a wide range of Densified and Unidentified micro silica derived from bye products while making ferrosilicon production process. Micro silica is a highly amorphous silica in nature with a very large surface area.
In Oilfield Cementing applications Micro Silica is mainly used as densification, pozzolan, and reactivity product to attain high & early strength of cementing.
In Oil well cementing industry Strength retrogression in concrete is important. It means during the hydration products formed when cement is exposed to high temperatures (>110°C / 230°F).
Due to this, there is a decline of cement strength at elevated temperatures & therefore decreased in strength & pore diameter is observed. The strength retrogression is achieved by reacting Silica with Calcium Hydroxide to turn it into a Calcium Silicate bond this reduces permeability and zonal isolation in the concrete pore.
The strength retrogression is achieved by reacting Micro Silica with Calcium Hydroxide turn into a Calcium Silicate bond this reduces permeability and zonal isolation in the concrete pore.
Dosage
Depending upon the concrete mix design but
usually replaced to the Cement by wt. from 1% to
5% depending on several factors.
Typical Properties
| Physical State | Ultrafine powder |
|---|---|
| Color | Dark to Light Gray |
| Sio2 | 92% min |
| Fe2O3 | 1% max |
| C | ≤2% |
| Loss on ignition | ≤3% |
| Moisture | ≤1% |
| Solubility(Water) | Insoluble |
| Melting point(°C) | Approx. 1230 |
| specific Gravity | 2.2-2.3 |
| Bulk density(kg/m3) | 500-680kg/m3 |
| Particle size(μm) | Approx 0.3 |
Benefits using Micro Silica in Concrete
- Lowers concrete permeability.
- Improve Chloride resistance
- Increases concrete durability.
- Increases Compressive Strength
- Improves bond between rebars/concrete
- Reduces alkali-silica reactivity.
- Excellent resistance to sulfate or seawater attack.
- Reduces corrosion
Advantages
- Narrower Particle size
- Highly reactive with calcium hydroxide
- Improved strength
- Work well in high temp. wells
- Longer shelf life
- Pure Inorganic
- Improved durability
- Improved flow of concrete
- Non-toxic
- Compatible with glass microspheres & other plasticizers.
Specifications
- Sio2 90% Min
- Moisture < 1%
- Loss On Ignition <5%
- BET Surface area >18 m2/gm
- Color: grey
Packaging
- 25kg soluble paper bags
- 25Kg BOPP Laminated bags
- 1000 kg Super Sacks