The role of nano silica powder in cement is mainly reflected in enhancing material properties, improving structural stability, and enhancing durability
Enhance mechanical performance
Nano silica combines with cement hydration products through volcanic ash reaction to form silicate cementitious materials, filling the micro pores inside concrete and significantly improving compressive and tensile strength. For example, adding 2% -5% nano silica can increase the early strength of concrete by 30% -50%.
Enhance durability
Nanoparticles infiltrate into the cracks and micropores inside the concrete, forming a dense protective layer that effectively prevents moisture and chloride ion infiltration, reducing the permeability coefficient by more than 50%. Simultaneously reducing carbonization depth and delaying steel corrosion.
Optimize shrinkage performance
By filling the pores and stabilizing the internal structure, the risk of shrinkage and cracking during the drying process of concrete is reduced. For example, adding nano silica can reduce the coefficient of linear expansion by 20% -30%, effectively improving volume stability.
Refine microstructure
The nucleation effect of nano silica can refine the grain size of cement hydration products and reduce porosity. Research has shown that adding it increases the specific surface area of concrete by 10% -20%, further enhancing its density.
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