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85% Undensified Silica Fume
| Place of Origin: China | Color: Grey |
| Existing Form: Powder | SiO2: ≥85.0% |
| Bulk Density: 280-350kg/m3 | Specific Surface: 15-30m2/g |
| Package: 25kg/ plastic bag OR 500kg/ jumbo bag | Application: Insulation materials, large concrete projects, mortar, pipe piles, etc. |
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85% Undensified Microsilica (Silica Fume Grade 85) is black or gray in color. Complied with ASTM C1240 silica fume standard. Was widly used as concrete admixture.
Bulk Density: 280-350Kg/m3
Tag: 85% Undensified Microsilica, 85% Undensified Silica Fume, Undensified Silica Fume Grade 85, Undensified Microsilica Grade 85, Concrete Silica Fume.
Microsilica ( Silica Fume ) Has the Following Features:
● Lowers concrete permeability.
● Significantly increases concrete durability.
● Increases ultimate strength gain.
● Beneficial in all types of high strength concrete applications.
● Improves bond strength to steel.
● Significantly reduces alkali-silica reactivity.
● Provides excellent resistance to sulfate or seawater attack.
● Reduces steel corrosion.
● Improves freeze/ thaw durability of concrete.
| 85% Microsilica ( Silica Fume ) | ||||
| Chemical & Physical Analysis Chemical & Physical Analysis | ASTM C1240 - 03 | EN 13263 : 2005 | ||
| Spec. | Frequency | Spec. | Frequency | |
| SiO2 (%) | > 85.0 | 400 MT | > 85 | Weekly |
| SO3 (%) | < 2.0 | Weekly | ||
| Cl (%) | < 0.3 | Weekly | ||
| Free CaO (%) | < 1.0 | Weekly | ||
| Free Si (%) | < 0.4 | Monthly | ||
| Alkalies (As Equivalent Na2O. %) | Report | 400 MT | ||
| Moisture (%) | < 3.0 | 400 MT | ||
| Loss On Ignition. LOI (%) | < 6.0 | 400 MT | < 4.0 | Weekly |
| Specific Surface (BET - m2/gram) | > 15 | 3200 MT/ 3 Months | > 15 & <35 | Monthly |
| Bulk Density (kg/m3) | Report | 400 MT | ||
Pozz. Activity Index (%) - 7 Days Accelerated Curing | > 105 | 3200 MT/ 3 Months | ||
Pozz. Activity Index (%) - 28 days Normal curing | > 100 | Monthly | ||
| Retained On 45 Micron Sieve (%) | < 10 | 400 MT | ||
Variation From Avg. Retained On 45 Micron (%-points) | < 5 | Avg. Of Last 10 Tests | ||
| Density (kg/m3) | Report | 400MT | ||
(1). Silica fume in Concrete:
● Increacing strength
● Increasing density
● Frost resistance
● Early strength
● Abrasion resistance performance, anti-cavitations
(2). Silica fume in Cement
● Strengthens the fibre cement product.
● Increases the packing density of the cement matrix.
● Thereby enhance the durability of the fibre cement product.
● Enhances the plasticity of the fresh mix.
● Increases the bending strength of fibre reinforced cement
(3). Silica fume is used in refractory
● Instead of aluminum oxide to be used as refractory material
● As additive in amorphous and shappely refractory products, greatly improved products strength and high temperature performance.
● As casting combination accelerators in integral teeming ladle
● Agglomerating agent, agglutinant, accelerator and additive in other refractory products..
(4). Other Applications for Silica Fume:
● Rubber industry
● Anti-caking industry
● Pellet binder
● Waterglass industry
● Shotcrete
● Self-Compacting Concrete
