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

A reinforced concrete and sacrificial anode technology, which is applied in the field of sacrificial anode cathodic protection devices for reinforced concrete structures, to achieve the effects of saving manpower and material resources, significant economic and social benefits, and stable open circuit potential

Inactive Publication Date: 2008-08-20
NANJING HYDRAULIC RES INST THE MINISTRY OF WATER RESOURCES THE MINIST
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Embodiment 1

[0046] Embodiment 1, the cathodic protection method of reinforced concrete structure sacrificial anode in salt polluted atmospheric environment, refer to figure 1 : The main structure of the present invention includes active mortar 1, grid sacrificial anode 2, junction box 3, steel bar 4, reinforced concrete structure 5, cathode cable 6 and anode cable 7.

[0047] First, a small piece of concrete is chiseled on the reinforced concrete structure to expose a small section of steel bar 4, and the cathode cable 6 is welded on the steel bar 4; Both cathode cable and anode cable welds need to be waterproof and sealed. After removing the dirt and small metal parts on the surface of the reinforced concrete structure 5, lay a layer of active mortar 1, lay the grid-shaped sacrificial anode 2 that has welded the anode cable on the surface of the active mortar 1, and then lay a layer of active mortar 1. The cathode cable 6 and the anode cable 7 are connected together through the junctio...

Embodiment 2

[0048] Embodiment 2 is basically the same as Embodiment 1, but with the following changes: the sacrificial anode is made of pure zinc. The water-cement ratio of the active mortar is 0.4:1. The lime-sand ratio of the active mortar is 0.5:1. The active additive is lithium bromide and lithium nitrate in a ratio of 1:1, which is a weight ratio. The dosage of active additive is 0.15g / cm 3 . The dosage range of the synthetic fiber is 0.15% of the weight of the mortar, and the synthetic fiber is polypropylene fiber. Sacrificial anodes are fixed to the reinforced concrete façade.

Embodiment 3

[0049] Embodiment 3 is basically the same as Embodiment 1, but has the following changes:

[0050] The water-cement ratio of the active mortar is 0.55:1. The gray-sand ratio of the active mortar is 0.6:1, the active additive is lithium bromide and lithium nitrate with a mass ratio of 1:1, and the dosage range of the active additive is 0.50g / cm 3 . The content of synthetic fiber is 0.5% of the mortar weight. The synthetic fiber incorporated is cellulose. The sacrificial anode is fixed on the bottom surface of reinforced concrete.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B32/02C04B40/00C04B28/04C04B16/06
Inventor 葛燕朱锡昶李岩
Owner NANJING HYDRAULIC RES INST THE MINISTRY OF WATER RESOURCES THE MINIST
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