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Pulverized-fuel-ash-based geopolymer steel structure non-shrinking anti-corrosive coating

A technology of geopolymers and anti-corrosion coatings, applied in anti-corrosion coatings, alkali metal silicate coatings, coatings, etc., can solve problems such as cracking, electrochemical corrosion, and large pollution

Inactive Publication Date: 2019-08-13
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional alkali-activated coating is prone to efflorescence and shrinkage to cause cracking, and the steel body is partially exposed to the natural environment, making the entire structure form a chemical primary battery and suffer more serious electrochemical corrosion
In addition, the industrial cement contained in the cement-based anti-corrosion coating has high energy consumption and high pollution in the production process.

Method used

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  • Pulverized-fuel-ash-based geopolymer steel structure non-shrinking anti-corrosive coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An anti-cracking and anti-pan-alkaline anti-corrosion and shrinkage coating for geopolymer steel structures excited by fly ash base, its mixing ratio is: 10% water glass, 5.5% sodium hydroxide, 16% water, 53% fly ash, 13.5 % slag, 2% talc;

[0026] (1) Take the above-mentioned mass fraction of sodium hydroxide and water glass and mix uniformly to prepare an alkali solution, stir evenly until the sodium hydroxide is completely dissolved, and seal and age for 24 hours; then mix and stir the above-mentioned low-calcium fly ash and slag Evenly, add the aged alkali activator and an appropriate amount of water (water-cement ratio 0.44) and continue to stir until uniform, and then the alkali-activated gelling material is obtained;

[0027] (2) Weigh the talcum powder according to the above mass fraction, add it to the alkali-activated gelling material in the above step (1), after the feeding is finished, increase the rotating speed to 4000r / min, and fully stir for 4min to obta...

Embodiment 2

[0031] An anti-cracking and anti-pan-alkaline anti-corrosion and shrinkage coating for geopolymer steel structures excited by fly ash base, the mixing ratio of which is: 9-10% water glass, 5% sodium hydroxide, 15% water, 49-50% powder Coal ash, 12-13% slag, 2% talcum powder, 6% titanium tailings.

[0032] (1) Take the above mass fraction of sodium hydroxide and water glass and mix uniformly to prepare an alkali solution, stir evenly until the sodium hydroxide is completely dissolved, and seal and age for 24 hours; then the above mass fraction of low-calcium fly ash, slag and extract Mix and stir the titanium tailings evenly, add the aged alkali activator and an appropriate amount of water (water-cement ratio 0.44) and continue to stir until uniform, and then the alkali-activated gelling material is obtained;

[0033] (2) Weigh the talcum powder according to the above mass fraction, add it to the alkali-activated gelling material in the above step (1), after the feeding is fini...

Embodiment 3

[0037] An anti-cracking and anti-pan-alkaline anti-corrosion and shrinkage coating for geopolymer steel structures excited by fly ash base, the mixing ratio of which is: 9-10% water glass, 5% sodium hydroxide, 15% water, 49-50% powder Coal ash, 12-13% slag, 2% talcum powder, 0.03% graphene oxide.

[0038] (1) Take the above-mentioned mass fraction of sodium hydroxide and water glass and mix uniformly to prepare an alkali solution, stir evenly until the sodium hydroxide is completely dissolved, and seal and age for 24 hours; then mix and stir the above-mentioned low-calcium fly ash and slag Evenly, fully dissolve the graphene oxide with the above mass fraction in an appropriate amount of water (water-cement ratio 0.44), add the aged alkali activator and continue stirring until uniform, that is, the alkali-activated gelling material is obtained;

[0039] (2) Weigh the talcum powder according to the above mass fraction, add it to the alkali-activated gelling material in the above...

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Abstract

The invention provides a non-shrinking pulverized-fuel-ash-based geopolymer steel structure anti-corrosive coating. Surface coatings of steel structures can obstruct direct contact of corrosive mediums such as chloride ions with reinforcing steel bars, and the anti-corrosive performance of the reinforcing steel bars is effectively improved; however, currently, surface coatings of the reinforcing steel bars have shortcomings that the interface bonding performance of the reinforcing steel bars and the concrete is lowered, pitting corrosion is triggered due to the defects of the coatings, and application of the coatings in practical engineering is seriously restricted accordingly. According to the non-shrinking pulverized-fuel-ash-based geopolymer steel structure anti-corrosive coating, by conducting blending to obtain a proper alkali excitation matching proportion, the cracking resistance and saltpetering resistance of the pulverized-fuel-ash-based geopolymer inorganic anti-corrosive coating are improved; meanwhile, the compactness, carbonization resistance and ion infiltration resistance of the coating are improved, the bonding strength between the coating and the reinforcing steelbars is improved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the anticorrosion coating for steel structures in civil engineering, and in particular relates to a non-shrinkage fly ash geopolymer anticorrosion coating for steel structures. Background technique [0002] Steel structures have the characteristics of light weight, high safety, and convenient construction, and are often used in civil engineering. However, the corrosion of steel bars is one of the main reasons affecting the service life of reinforced concrete. Under extreme conditions, such as severe air pollution, seawater immersion, etc., the corrosion of steel bars is very serious. Severe corrosion makes steel bars lose their mechanical strength and bearing capacity, resulting in bridges, offshore platforms, waterways, ports, dams and other infrastructure. Part or all of the structure collapses, bringing huge economic losses and potential safety hazards. [0003] At present, anti-corrosion coating has become one of the most...

Claims

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Application Information

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IPC IPC(8): C09D1/02C09D7/61C09D5/08
CPCC09D1/02C09D5/08C09D7/61
Inventor 王淑萍周沐雨胡秋雨韩昌
Owner CHONGQING UNIV
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