
Microsilica Fume For Improved Concrete Durability
Microsilica fume is typically packaged in 25kg or 50lb paper or plastic bags, or in bulk bags (also known as FIBCs) that can hold several hundred or thousand kilograms of material.
Опис
Benefits
Microsilica fume, also known as silica fume, is often used as an additive in concrete to improve its durability and longevity. Concrete made with microsilica fume is commonly used in critical infrastructure such as bridges, highways, and buildings, as well as in marine environments.
Increased compressive strength: Microsilica fume can significantly increase the compressive strength of concrete, making it better able to withstand heavy loads and resist cracking.
Reduced permeability: The addition of microsilica fume to concrete can reduce its permeability, making it more resistant to water penetration and corrosion.
Improved resistance to chemical attack: Microsilica fume can increase the resistance of concrete to chemical attack from substances such as sulfates and chlorides, which can cause concrete to deteriorate over time.
Reduced thermal cracking: The use of microsilica fume can help reduce the incidence of thermal cracking in concrete, which can occur due to temperature changes and differential expansion and contraction.
Improved workability: Despite its densifying effect, microsilica fume can improve the workability of concrete, making it easier to handle and place during construction.
Specification
| Property | Specification |
|---|---|
| Silica fume content | ≥ 85% |
| Loss on ignition (LOI) | ≤ 5% |
| Specific surface area | ≥ 15 m2/g |
| Bulk density | ≥ 550 kg/m3 |
| Color | Grey or black powder |
| pH | 5-9 |
| Chloride content | ≤ 0.1% by mass |
| Sulfate content | ≤ 3% by mass |
| Carbon content | ≤ 3% by mass |
| Moisture content | ≤ 3% by mass |
| Compressive strength | Increased by up to 20-40% |
| Permeability | Reduced by up to 50% |
| Chemical resistance | Improved |
| Thermal cracking | Reduced |



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