KONADA
By mixing a small amount of nano silica into concrete, ultra-high strength and ultra-high durability concrete can be easily prepared. At present, a large number of research studies have demonstrated that nano SiO2 has a positive modification effect on cement.The cement paste doped with nanosilica has reduced fluidity, shortened setting time, and significantly improved early strength.Nano-doped nano silica can absorb Ca(OH)2 (calcium hydroxide) enriched at the interface more effectively and quickly, and reduce the degree of Ca(OH)2 orientation. A secondary hydration reaction occurs between nano-SiO2 and Ca(OH)2 produced by the hydration of 3CaO·SiO2 (tricalcium silicate). Utilize nano-SiO2 to absorb and reduce Ca(OH)2 in the body of hardened cement paste to enhance the strength of the cement paste, particularly its early strength.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 have been significantly enhanced. By incorporating nano-silicon carbide at a concentration 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 enhanced 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 withstands 25-50 cycles, and its relative elastic modulus is even lower. 30-73%.
(4) Early Strength: Concrete with nano silica SiO2 shortens the induction period and exhibits early strength characteristics.
(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 compared to ordinary concrete.Nano silica SiO2 is specifically used in the following engineering construction fields: Water conservancy and hydropower projects involve hydraulic structures such as dam intake sluices, diversion channels, tunnels, surge shafts, substructures of the main powerhouse (especially water turbine volutes), etc. Text: ### It is good to make full use of nano-silica SiO2 cement for its characteristics of waterproofing, impermeability, erosion resistance, and cavitation resistance.
(2) Construction and Civil Engineering: Nano-silica SiO2 concrete exhibits early strength and high strength characteristics, making it extensively utilized in industrial plants and high-rise buildings.
(3) Highway Construction: Utilize the early strength, high strength, and wear resistance of nano-silica SiO2 concrete to construct high-grade highways, airport runways, highway tunnels, and road surface repair projects.
(4) Port, bridge, and saltwater projects: Nano-silica SiO2 concrete has high density and resistivity, making it resistant to electrochemical damage and enhancing anti-corrosion performance.Nano silica SiO2 dispersion in cement materials. Utilizing microdispersion technology and ultrasonic oscillation to disperse nano-SiO2 particles, either by dry mixing in a high-speed sampler or by creating a sol through water mixing, ensures the full and uniform dispersion of nano-SiO2 into cement slurry or concrete mixture.
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