Steel reinforced concrete sacrificial anode cathodic protection devices in atmospheric environment and method thereof

Abstract

The invention relates to a protection device for sacrificial anodes and sacrificial cathodes in reinforced concrete structures in the atmospheric environment; wherein, the reticular sacrificial anodes are electrically connected with steel bars in concrete to form a protection system for the sacrificial anodes and sacrificial cathodes; the protection device is characterized in that the sacrificial anode is embedded in active mortar which is laid on the surface of the reinforced concrete; the sacrificial anode adopts pure zinc or zinc alloy; the active mortar consists of Portland cement, aggregates, water, synthetic fibers and active additives, and the water-cement ratio is 0.35 to 0.55:1 and the cement-sand ratio is 0.3 to 0.6:1; the active additives are lithium bromide or lithium nitrate with the mixing amount of 0.05 to 0.50g / cm <3>; the synthetic fibers are selected from polypropylene fiber, polyethylene fiber, cellulose and / or glass fiber with the mixing amount of 0.05 to 0.5 percent; the protection device also comprises a protection method; the protection device saves human and material resource and has low price and service life as long as 20 years; the active mortar does not shrink or crack and is lower in resistivity, high in intensity and stable in the open circuit potential of the sacrificial anode.

Description

technical field [0001] The invention relates to a reinforced concrete anticorrosion device and method, in particular to a sacrificial anode cathodic protection device for a reinforced concrete structure in a salt-polluted atmospheric environment, and a method for using the device to protect a reinforced concrete structure in a salt-polluted atmospheric environment. Background technique [0002] Reinforced concrete structure is the most widely used structural form at present. Typically, concrete is highly alkaline, and a thin protective oxide film forms on the surface of the reinforcement. The oxide film passivates the surface of the steel bar and effectively prevents the corrosion of the steel bar. However, in a salt-polluted environment, when the chloride ion content in the concrete liquid phase around the steel bar reaches a critical value, the passivation film of the steel bar will be partially destroyed, and as long as other necessary conditions for corrosion are met, s...

AI Technical Summary

Problems solved by technology

Because the tidal range and splash area of ​​the marine environment are very different from the salt-polluted atmospheric environment, it is impossible to simply apply this type of scheme directly to the protection of reinforced concrete structures in the salt-polluted atmospheric environment

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