What is Densified Micro Silica Fume?

Densified micro silica fume introduction

Densified micro silica fume is a type of silica fume that has been treated to increase its bulk density. This is done by tumbling the silica fume particles in a silo, which induces surface charges to accumulate. The increased density makes densified micro silica fume easier to handle and transport, and it also improves its performance in concrete.

The difference between Densified and undensified micro silica fume

Density

The main difference between densified and undensified micro silica fume is their density. Densified micro silica fume has a bulk density of 550~700 kg/m³, while undensified micro silica fume has a bulk density of 250~350kg/m³. This means that densified micro silica fume is more compact and easier to handle and transport.

Specific Surface Area

Densified micro silica fume also has a higher specific surface area than undensified micro silica fume. This means that it has more surface area per unit volume, which makes it more effective in improving the properties of concrete and other materials.

Properties

In terms of their properties, densified and undensified micro silica fume are very similar. Both types of micro silica fume are amorphous, which means that they do not have a crystalline structure. They are also both very fine, with particle sizes typically ranging from 0.1 to 0.2 microns.

Performance

Both densified and undensified micro silica fume are used to improve the properties of concrete and other materials. However, densified micro silica fume is more effective in improving the strength, durability, and water resistance of concrete. It is also more economical to transport and use.

Beyond that, there are some other key differences between densified and undensified micro silica fume:

• Reactivity: Densified micro silica fume is more reactive than undensified micro silica fume. This means that it can react more quickly with cement to form a stronger bond.
• Water demand: Densified micro silica fume requires less water than undensified micro silica fume. This can help to improve the workability of concrete and mortar mixes.
• Permeability: Densified micro silica fume is less permeable than undensified micro silica fume. This makes it more resistant to water and other fluids.
• Cost: Densified micro silica fume is more expensive than undensified micro silica fume.

PropertyDensified micro silica fumeUndensified micro silica fumeBulk density550~700 kg/m³250~350kg/m³Specific surface areaHigherLowerReactivityMore reactiveLess reactiveWater demandLess water demandMore water demandPermeabilityLess permeableMore permeableCostMore expensiveLess expensive

The best type of micro silica fume to use will depend on the specific application. For applications where density and reactivity are important, such as in high-performance concrete, densified micro silica fume is the better choice. For applications where cost is a major factor, undensified micro silica fume may be a better option.

Densified micro silica fume applications

Densified micro silica fume has the same properties as undensified silica fume, but it is more effective in improving the properties of concrete and other materials. It is used in a variety of applications, including:

• Concrete: Densified micro silica fume can be used to improve the strength, durability, and water resistance of concrete. It can also be used to reduce the permeability of concrete, which makes it more resistant to chloride ions and other harmful substances.
• Mortar: Densified micro silica fume can be used to improve the workability and strength of mortar. It can also be used to reduce the shrinkage of mortar, which makes it less likely to crack.
• Grout: Densified micro silica fume can be used to improve the strength and durability of grout. It can also be used to reduce the permeability of grout, which makes it more resistant to water and other fluids.
• Other applications: Densified micro silica fume can also be used in a variety of other applications, such as:
  • Making fire-resistant materials
  • Improving the thermal insulation properties of materials
  • Making self-healing concrete
  • Making lightweight aggregate

HSA Micro Silica Fume

HSA Group is a professional micro silica fume manufacturer and supplier. Since 2001, we have provided high quality micro silica fume to many companies around the world. Our main micro silica fume products include: 85%-96% densified micro silica fume , 85%-99% undensified silica fume, zirconium silica fume.

If you have any needs for silica fume, please feel free to contact us!