Ewende Micro silica fume has the following important effects on concrete durability:
I.Improvement of impermeability
Micro silica powder fills the pores in the concrete and makes the concrete denser. This reduces the channel for water and aggressive media penetration, greatly improving the impermeability of concrete. In some hydraulic structures, underground projects, the use of microsilica powder can effectively prevent water infiltration, avoiding the destruction of concrete structure and corrosion of reinforcing steel due to water seepage.
II. Frost resistance enhancement
Dense structure makes concrete in the freeze-thaw cycle process, resistance to frost damage ability to enhance. Micro silica powder can improve the microstructure of concrete and reduce the internal cracks and damage caused by freezing and thawing. In the cold region of the concrete project, the addition of microsilica powder can significantly improve the frost durability of concrete and extend the service life of the concrete structure.
III.Chemical erosion resistance enhancement
Concrete in the chemical erosion environment, such as acid, alkali, salt and other media, easy to be damaged. Microsilica powder can react with the hydration products of cement to generate a more stable substance, enhancing the resistance of concrete to chemical erosion. For example, in the concrete structure in the marine environment, micro silica powder can effectively reduce the erosion of seawater on the concrete.
IV.The ability to improve the resistance to carbonation
Carbonation will reduce the alkalinity in concrete, resulting in the loss of protection and rusting of reinforcing steel. The addition of micro silica powder makes the concrete denser and reduces the infiltration of carbon dioxide, which reduces the carbonization rate of concrete. This is essential to protect the durability of reinforced concrete structures.
V.Wear resistance improvement
Micro silica powder can improve the strength and hardness of concrete, making its surface more wear-resistant. In some pavements, industrial plant floors and other concrete projects that need to withstand wear and tear, the use of micro silica powder can extend the service life of concrete and reduce maintenance costs.