What is densified Silica fume

Densified silica fume   - is the product obtained by densifying the dry, fluffy, undensified silica fume. These products have high density and are economical for transportation. They can be processed like fly ash in cement or concrete factories. The encapsulation process can significantly reduce the volume of the unencapsulated silica fume.

the method for producing densified silica fume is to place the produced silica fume in a silo. Compressed air is blown into the bottom of the silo, causing the particles to roll. When the particles roll, they gather. The heavier aggregates fall to the bottom of the silo and are collected regularly. Because the aggregates are relatively weakly held together, they decompose during the concrete production process as the mixture is mixed and stirred. Most of the published information and the mechanically compressed encrypted silica fume used in the field come from air densification.

The role of densified silica fume in the concrete matrix is significant. Its mechanism of action is carried out through both physical and chemical aspects. As a result of these physical and chemical mechanisms, changes can be observed in the microstructure of the matrix, such as reducing permeability and particle filling. In the concrete system, dense silica fume requires thorough mixing and dispersion. It should be added first with coarse aggregates to provide a strong frictional effect. After being dispersed by a high-power mixer, there are fewer clusters and they can be dispersed relatively better. The pozzolanic reaction of silica fume also plays a role in improving the interface transition zone, thereby enhancing the compressive strength of the concrete.