Adding silica sol to cement? Silica sol can also be applied in the infrastructure industry

Silica sol has a wide range of uses. It's surprising that silica sol can also be added to cement and has many advantages. Let's take a look together!

Treating soil with silica sol can enhance its compressive strength and stability and can be used in roadbed construction. Silica sol used to treat cement can endow it with properties such as compressive strength, high-temperature resistance, weather resistance and good hydraulic properties. When used in combination with cement-based materials, it can significantly improve the overall performance of cement-based materials, such as enhancing mechanical properties, compressive strength, durability, etc. And enhance the strength and service life of buildings. At the same time, it can be used for the repair, reinforcement and protection of cement-based building surfaces, improving the quality of buildings.

　　

The following properties of silica sol endow it with the function of enhancing cement-based materials

　　

Silica sol has high dispersibility. Silica sol is composed of silica nanoparticles with a particle size ranging from 5 to 100 nm, which endows it with better dispersibility. When added to the castable in liquid form, it can be better dispersed in the powder and improve the performance of the castable.

　　

(2) Silica sol has excellent reactivity. When silica sol is used as a binder, the strength of the castable can be obtained through sol-gel reaction. Compared with silica micro-powder, silica nanoparticles have a larger specific surface area and higher surface energy, which can increase the reaction rate and degree between particles in castable materials at a lower temperature.

　　

(3) Silica sol has good adhesion. Due to the small and uniform particle size of silica nanoparticles in silica sol, siloxane bonds are formed between the dried nanoparticles, creating a special network structure with a certain bonding strength. In addition, silica sol has a low viscosity and can penetrate into the pores of particles, thus the gel structure formed by dry silica sol encapsulates the particles, resulting in a higher bonding strength.

　　

(4) When some metal ions such as Ca2+ and Mg2+ are added to silica sol, the metal ions break the Si-O-Si(siloxane bond) to form a new chemical bond Si-O-M(metal), which has better properties than the siloxane bond, such as stronger bonds and shorter bonding times.