What Is Silica Fume Concrete?

Silica fume, also known as micro-silica, is a highly reactive pozzolanic material that is used as a mineral admixture in concrete. Silica fume concrete refers to concrete that contains silica fume as a partial replacement for cement.

Advantages Of Silica Fume In Concrete:

‌The advantages of silica fume in concrete mainly include improving the strength, durability, crack resistance of concrete, and improving the workability of concrete. ‌

Improve the strength and durability of concrete‌: Silica fume can fill the pores between cement particles and form gel with hydration products, significantly improving the compression resistance, flexural resistance, impermeability, anti-corrosion, impact resistance and wear resistance of concrete. performance. In harsh environments, such as chlorine salt pollution corrosion, sulfate corrosion, high humidity and other conditions, silica powder can greatly improve the durability of concrete, even doubling or even multiplying its durability.

‌Improve the workability of concrete‌: The fine particles of silica powder can fill in the gaps between cement particles, improving the strength and durability of concrete. At the same time, silica fume has a strong pozzolanic effect and can undergo a secondary hydration reaction with the cement hydration product Ca(OH)2 to form a gelling product, fill the cement stone structure, improve the microstructure of the slurry, and improve the strength of the hardened body. Mechanical properties and durability‌.

‌Improve the crack resistance of concrete‌: The particles of silica fume are extremely fine and can be evenly distributed in the concrete to form a dense microstructure, thus improving the crack resistance of concrete. This characteristic makes silica fume a powerful assistant in improving the crack resistance of concrete.

Enhance the early strength of concrete‌: Silica fume has extremely high volcanic ash activity and can quickly react with calcium hydroxide produced by cement hydration to generate more calcium silicate gel, filling the pores inside the concrete, thereby improving the quality of the concrete. The compactness enhances the early strength‌.

Improve anti-penetration performance and salt corrosion resistance‌: Silica powder is incorporated into concrete to improve anti-penetration performance and salt corrosion resistance, protecting steel bars from corrosion. In underwater projects, silica fume concrete can significantly improve the problem of rapid corrosion of steel bars caused by chloride ion penetration.

In summary, the application of silica fume in concrete can not only significantly improve the strength and durability of concrete, but also improve the workability and crack resistance of concrete. It is an ideal concrete additive.