How Is The Fineness Of Micro Silica Powder (Silica Fume) Expressed? How Does It Affect Its Properties?

The fineness of micro silica powder has an important influence on its properties:

1.Activity: The finer the fineness and the larger the specific surface area, the higher the activity of the micro silica powder. In concrete, it can react more effectively with the hydration products of cement and improve the strength and durability of concrete.

2.Filling: Fine silica fume can better fill the gaps between the cement particles, make the concrete more dense, reduce the porosity, thus improving the impermeability and frost resistance of concrete.

3.Water requirement: The increase in fineness may lead to a slight increase in the water requirement of micro silica fume. This factor needs to be taken into account in the design of concrete ratios to ensure the workability of the concrete.

4. Dispersibility: Finer silica fume is easier to disperse uniformly, which is conducive to its reinforcing effect. However, if the fineness is too fine, the phenomenon of agglomeration may occur, affecting its performance.