Nano-SiO2 can effectively absorb the Ca(OH)2 enriched in the cement hardened paste marble interface, and can also effectively refine the Ca(OH)2 grains in the interface.

The effect of silica SIO2 on concrete is mainly manifested in:

(1) Increase strength. The compressive strength and flexural strength of the concrete are greatly increased. By incorporating nano-silicon carbide of 1/1000%, the compressive strength can be increased by 10-30%, and the flexural strength can be increased by more than 20%.
(2) Increase the density. The impermeability is increased by 5-18 times, and the chemical resistance is increased by more than 6 times.
(3) Frost resistance: Nano-silica SIO2 undergoes 300-600 rapid freeze-thaw cycles, and its relative elastic modulus is 10-15% lower, while ordinary concrete passes 25-50 cycles, and its relative elastic modulus is lower. 30-73%.
(4) Early strength: Nano silica SIO2 concrete shortens the induction period and has the characteristics of early strength.
(5) Anti-erosion and cavitation resistance: Nano-silica SIO2 concrete improves anti-erosion ability by 1.5-2.5 times and anti-cavitation ability by 3-12 times than ordinary concrete.

Nano silica SIO2 is specifically used in the following engineering construction fields:

(1) Water conservancy and hydropower projects: hydraulic structures such as dam intake sluices, diversion channels, tunnels, surge shafts, substructures of the main powerhouse (especially water turbine volutes), etc. It is good to make full use of nano-silica SIO2 cement The characteristics of waterproof, impermeability, erosion resistance and cavitation resistance.
(2) Construction and civil engineering: Nano-silica SIO2 concrete has the characteristics of early strength and high strength, and is widely used in industrial plants and high-rise buildings.
(3) Highway construction: Make full use of the early strength, high strength and wear resistance of nano-silica SIO2 concrete, and can build high-grade highways, airport runways, highway tunnels and road surface repair projects.
(4) Port, bridge, and salt water projects: Nano-silica SIO2 concrete has high density and high resistivity, is not easy to form electrochemical damage, and enhances anti-corrosion performance.

Nano silica SIO2 dispersion in cement materials. Using microdispersion technology, ultrasonic oscillating to disperse nano-SiO2 particles, dry mixing in a high-speed sampler or making sol into the sample by mixing water, so that nano-SiO2 can be fully and evenly dispersed into cement slurry or concrete mixture.

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