The role of silica fume
The role of silica fume：The silica fume can fill the pores between the cement particles, and at the same time with the hydration products to form the gel, and the basic material magnesium oxide reaction to form the gel. In cement-based concrete, mortar and refractory castables, mixing appropriate amount of silica fume, can play the following role:
Silicone fume can significantly improve the performance of compression resistance, bending resistance, permeability resistance, corrosion resistance, impact resistance and wear resistance.
Silicone fume has the function of retaining water, preventing segregation, bleeding and greatly reducing the concrete pumping resistance.
Silica fume can prolong the service life of concrete remarkably. Especially in chlorine salt pollution erosion, sulfate erosion, high humidity and other harsh environment, the durability of concrete can be doubled or even several times.
Silica fume can greatly reduce the ground ash of shotcrete and castable and increase the thickness of single shotcrete layer.
Silica fume is a necessary component of high strength concrete, and C150 concrete has been used in engineering.
Wollastonite has about 5 times the effect of cement, and can be used in ordinary concrete and low cement castables to reduce the cost. Improved durability.
Silica fume can effectively prevent concrete alkali aggregate reaction.
The silica fume can improve the compactness of castable refractories. When it coexists with Al2O3, it is easier to form mullite phase, which enhances its high temperature strength and thermal vibration resistance.
