How to restrain concrete corrosion phenomenon?
Keywords
Concrete, Erosion, Tunnel, Nano Silica
The most common phenomenon of tunnels in use is leakage.
The main cause of tunnel leakage is the dissolution of concrete. So how to inhibit the corrosion of concrete?
Reducing the water-cement ratio can increase the compactness of the microstructure of the slurry and significantly improve the ability of the cement-hardened slurry to resist water corrosion.
Compared with pure cement slurry, mineral admixtures can further react with cement hydration products to further improve the compactness and corrosion resistance of the slurry.
After the concrete is mixed with nano-silica, many closed, uniform and discontinuous bubbles are formed in the concrete slurry. The formation of these bubbles can not only reduce the permeability of the concrete, but also shorten the pore water flow of the concrete and reduce the hydrostatic pressure.
The use of nano-SiO2 in concrete can densify the concrete microstructure, delay the diffusion and transmission rate of erosive ions in the concrete, and achieve the effect of inhibiting corrosion.
