Corrosion prevention method and corrosion prevention device

Patent metadata

Field	Value
Publication number	US-12172183-B2
Application number	US-202017431567-A
Country	US
Kind code	B2
Filing date	Feb 6, 2020
Priority date	Feb 20, 2019
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

To repair reinforced concrete easily and at low cost. An anticorrosion method includes infiltrating an anticorrosion solution held inside concrete of reinforced concrete into a vicinity of a reinforcing bar through the concrete to passivate the reinforcing bar, detecting that the anticorrosion solution is infiltrated to a surface of the concrete, and discharging, after detecting the anticorrosion solution, the anticorrosion solution to outside of the concrete to form an anticorrosive coating on a surface of the reinforcing bar.

First claim

The invention claimed is:

1. An anticorrosion method for suppressing corrosion of a reinforcing bar in reinforced concrete, the method comprising:
infiltrating an anticorrosion solution a vicinity of the reinforcing bar through the concrete to passivate the reinforcing bar, wherein the anticorrosion solution is held in a storage unit formed by the concrete and disposed inside the concrete;
detecting that the anticorrosion solution is infiltrated to an outside surface of the concrete; and
discharging, after detecting the anticorrosion solution, the anticorrosion solution remaining in the storage unit to outside of the concrete to form an anticorrosive coating on a surface of the reinforcing bar.

2. An anticorrosion device configured to suppress corrosion of a reinforcing bar in reinforced concrete, comprising:
a storage unit formed inside concrete of the reinforced concrete and formed by the concrete, wherein the storage unit is configured to hold an anticorrosion solution;
a detection unit configured to detect that the anticorrosion solution is infiltrated to an outside surface of the concrete; and
a drainage unit configured to discharge, after detection of the anticorrosion solution by the detection unit, the anticorrosion solution remaining in the storage unit from the storage unit, wherein
the anticorrosion solution includes a solution that infiltrates into a vicinity of the reinforcing bar through the concrete to passivate the reinforcing bar and forms an anticorrosive coating on a surface of the reinforcing bar.

3. The anticorrosion device according to claim 2 , wherein
the drainage unit includes a drainage valve configured to discharge the anticorrosion solution from the storage unit, and
the drainage valve operates when the detection unit detects the anticorrosion solution.

4. The anticorrosion device according to claim 3 , wherein the anticorrosion solution includes a pH value in the range of pH 7 to pH 12.

5. The anticorrosion device according to claim 3 , wherein the anticorrosion solution includes a solution that uses rainwater as a solvent and is alkalized by elution of calcium hydroxide in an unneutralized region of the concrete into the rainwater.

6. The anticorrosion device according to claim 3 , wherein the anticorrosion solution comprises at least one of sodium hydrogen carbonate, potassium hydroxide, sodium hydroxide, or calcium hydroxide.

7. The anticorrosion device according to claim 2 , wherein
the drainage unit includes a drainage pump configured to discharge the anticorrosion solution from the storage unit, and
the drainage pump operates when the detection unit detects the anticorrosion solution.

8. The anticorrosion device according to claim 7 , wherein the anticorrosion solution includes a pH value in the range of pH 7 to pH 12.

9. The anticorrosion device according to claim 7 , wherein the anticorrosion solution includes a solution that uses rainwater as a solvent and is alkalized by elution of calcium hydroxide in an unneutralized region of the concrete into the rainwater.

10. The anticorrosion device according to claim 7 , wherein the anticorrosion solution comprises at least one of sodium hydrogen carbonate, potassium hydroxide, sodium hydroxide, or calcium hydroxide.

11. The anticorrosion device according to claim 2 , wherein the anticorrosion solution includes a pH value in the range of pH 7 to pH 12.

12. The anticorrosion device according to claim 11 , wherein the anticorrosion solution includes a solution that uses rainwater as a solvent and is alkalized by elution of calcium hydroxide in an unneutralized region of the concrete into the rainwater.

13. The anticorrosion device according to claim 11 , wherein the anticorrosion solution comprises at least one of sodium hydrogen carbonate, potassium hydroxide, sodium hydroxide, or calcium hydroxide.

14. The anticorrosion device according to claim 2 , wherein the anticorrosion solution includes a solution that uses rainwater as a solvent and is alkalized by elution of calcium hydroxide in an unneutralized region of the concrete into the rainwater.

15. The anticorrosion device according to claim 2 , wherein the anticorrosion solution comprises at least one of sodium hydrogen carbonate, potassium hydroxide, sodium hydroxide, or calcium hydroxide.

16. An anticorrosion device configured to suppress corrosion of a reinforcing bar in reinforced concrete, comprising:
a storage unit formed inside concrete of the reinforced concrete and formed by the concrete, storage unit is configured to hold an anticorrosion solution; and
a drainage unit configured to discharge the anticorrosion solution from the storage unit, wherein
the anticorrosion solution includes a solution that infiltrates into a vicinity of the reinforcing bar through the concrete to passivate the reinforcing bar and forms an anticorrosive coating on a surface of the reinforcing bar, and
the drainage unit is formed of an identical concrete as the concrete, wherein a thickness of the drainage unit is not less than a thickness of the concrete between the storage unit and the reinforcing bar, and less than a thickness of the concrete between the storage unit, through the reinforcing bar, and an outside surface of the concrete.

17. The anticorrosion device according to claim 16 , wherein the anticorrosion solution includes a pH value in the range of pH 7 to pH 12.

18. The anticorrosion device according to claim 16 , wherein the anticorrosion solution includes a solution that uses rainwater as a solvent and is alkalized by elution of calcium hydroxide in an unneutralized region of the concrete into the rainwater.

19. The anticorrosion device according to claim 16 , wherein the anticorrosion solution comprises at least one of sodium hydrogen carbonate, potassium hydroxide, sodium hydroxide, or calcium hydroxide.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Takeuchi Yosuke
• ISHII Ryuta
• Oki Shota
• Kamisho Takuya
• Tsuda Masayuki

Classifications

• G01N17/00

  Investigating resistance of materials to the weather, to corrosion, or to light · CPC title

• E04G23/02

  Repairing, e.g. filling cracks; Restoring; Altering; Enlarging {(compositions of filling material C04B; strengthening, widening, repairing of bridges E01D22/00; drying damp layers by temporary mechanical ventilation E04B1/7092)} · CPC title

• C09D5/084

  Inorganic compounds · CPC title

• C04B41/65 Primary

  with inorganic materials · CPC title

• C04B41/4535

  applied as a solution, emulsion, dispersion or suspension · CPC title