Concrete structure heavy-duty nano composite coating and protection method

A nano-composite coating and concrete structure technology, applied in the field of heavy-duty anti-corrosion nano-composite coatings and protection for concrete structures, can solve the problems of easy cracking of the paint film, high maintenance costs, and short anti-corrosion life, and achieve easy promotion and application and construction methods Simple, good impact resistance effect

Active Publication Date: 2009-06-17
JIANGSU CUMT DAZHENG SURFACE ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Ordinary epoxy primers have low adhesion to concrete substrates, generally only 2 to 3 MPa;
[0006] 2. The traditional heavy-duty anti-corrosion coating system has a short anti-corrosion life, generally about 10 years;
[0007] 3. The coating is not flexible enough, and the paint film is easy to crack, etc.
The structure and method have appropriate elasticity, good air permeability, and environmental protection, but they do not solve the problem of low adhesion of the anti-corrosion coating of the concrete structure, and the durability of the coating is poor, and the anti-corrosion life of the concrete structure is short. It is also not suitable for harsh corrosive environments such as oceans, and the maintenance cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: A nanocomposite coating anti-corrosion coating test was carried out on the atmospheric area of ​​a concrete pile of a certain sea-crossing bridge. First, use an electric angle grinder to grind the concrete surface, remove the loose layer on the surface, chisel off the cracked or loose concrete, spray the concrete surface of the pier column with fresh water and high-pressure water gun, and dry it naturally after washing. After washing, the concrete surface should be clean, firm and dense No looseness; then spray 2 coats of nano-modified epoxy sealer paint to completely seal the concrete micropores with a thickness of 50 μm; after the sealer paint dries for 24 hours, spray 2 coats of nano-modified epoxy mica iron intermediate paint with a thickness of 50 μm After the intermediate paint has dried naturally for 36 hours, spray two layers of nano-modified fluorine-containing polyurethane topcoat with a thickness of 80 μm.

[0024] After the above-mentioned coating...

Embodiment 2

[0025] Example 2: A nanocomposite coating anti-corrosion coating test was carried out on concrete piles of a certain city overpass. First, use an electric angle grinder to grind the concrete surface, remove the loose layer on the surface, chisel off the cracked or loose concrete, spray the concrete surface of the pier column with fresh water and high-pressure water gun, and dry it naturally after washing. After washing, the concrete surface should be clean, firm and dense No looseness; then spray 1 layer of nano-modified epoxy sealer paint to seal the micropores on the concrete surface and penetrate into part of the concrete interior. The dry film thickness of the coating is 30 μm; 70μm; finally spray a silicone acrylic topcoat, thickness: 50μm.

[0026] The overpass is in the urban atmospheric corrosion environment, and the total thickness of the concrete anti-corrosion nano-composite coating is designed to be 150 μm. After inspection, the coating surface is intact without an...

Embodiment 3

[0027] Example 3: A nano-composite coating anti-corrosion coating test was carried out on the concrete structure of a harbor project. First, use an electric angle grinder to grind the concrete surface, remove the loose layer on the surface, chisel off the cracked or loose concrete, spray the concrete surface of the pier column with fresh water and high-pressure water gun, and dry it naturally after washing. After washing, the concrete surface should be clean, firm and dense No looseness; then spray 2 layers of nano-modified epoxy sealer paint to completely seal the concrete micropores, with a thickness of 60 μm; then spray 3 layers of nano-modified epoxy miracic iron intermediate paint, with a thickness of 180 μm; finally spray 2 layers containing Fluoropolysiloxane topcoat, thickness: 80μm.

[0028] The concrete structure of the harbor project is in a severe marine corrosion environment, and the anti-corrosion requirements of the coating are very high. Therefore, the total th...

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Abstract

The invention relates to a heavy anti-corrosion nano composite coating and a protection method for a concrete structure. The protection method belongs to a method for protecting the reinforced concrete structure. The heavy anti-corrosion nano composite coating for the concrete structure has a three-layer structure and comprises nano modified epoxy sealing coatings, a nano modified epoxy micaceous iron oxide intermediate paint and a nano modified fluorine-containing polyurethane finish or a fluorine-containing polysiloxane finish from inside to outside in turn. By adoption of the nano composite coating protection technology to perform anti-corrosion coating on the concrete structure, the anti-corrosion service life can reach more than 20 years, and the adhesion of the coating can be doubled compared with a common anti-corrosion coating; the coating has better impact resistance, sediment incrustation resistance, weathering resistance and flexibility; and the construction method is simple, and easy to popularize and apply, and has low cost.

Description

technical field [0001] The invention relates to a method for anticorrosion of a reinforced concrete structure, in particular to a heavy-duty anticorrosion nanocomposite coating for a concrete structure and a protection method. Background technique [0002] For concrete structures located by the sea or in seawater, since the air or seawater contains a large amount of chloride ions, the penetration of chloride ions into the concrete structure will aggravate the corrosion of the concrete structure, resulting in damage to the concrete structure or the durability and safety of the building Greatly reduced. Carbonation of concrete is another chemical corrosion suffered by concrete. In the presence of water and air, the carbonized concrete structure will cause the concrete to lose its protective effect on the steel bars, and the steel bars will begin to rust. The rusted steel bars will not only fail Provide strength support to concrete, and will destroy the structure of concrete d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/52
CPCC04B2111/20C04B41/52C04B41/009
Inventor 易春龙安云岐洪伟谢谦
Owner JIANGSU CUMT DAZHENG SURFACE ENG TECH
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