The silica powder can fill the pores between the cement particles, and at the same time form gel with the hydration product, and react with the alkaline material magnesium oxide to form gel。Adding appropriate amount of silica fume into cement-based concrete, mortar and refractory castable can play the following roles:
It significantly improves the resistance to pressure, folding, impermeability, corrosion resistance, impact resistance and wear resistance。
2.It has the function of retaining water, preventing segregation, bleeding and greatly reducing the pumping resistance of concrete。
It significantly prolongs the service life of concrete。
It greatly reduces the ground ash of shotcrete and castable, and improves the thickness of a single spray layer。
⒌ is a necessary component of high-strength concrete, and C150 concrete has been applied in engineering。
It has about 5 times the effect of cement, and the application of ordinary concrete and low cement castable can reduce the cost.Improve durability。
It effectively prevents the reaction of concrete alkali aggregate。
Improve the densification of poured refractory。When coexisting with Al2O3, it is easier to generate mullite phase, so that its high temperature strength and thermal vibration resistance are enhanced。
