Preparation method of inorganic anti-corrosive paint for steel bar

Abstract

The invention belongs to the technical field of building materials and particularly relates to an inorganic anti-corrosive paint for a steel bar. The inorganic anti-corrosive paint is prepared from a hydraulic cementing material, a modifying agent, a plasticizer, superfine nanometer powder, an active composite material, aggregates and mixing water at a certain ratio. The inorganic anti-corrosive paint prepared by the method disclosed by the invention is quite good in workability; the surface of the steel bar has a quite good adhesive force and is unlikely to sag after being mechanically sprayed with the inorganic anti-corrosive paint; the paint can be rapidly coagulated; the paint formed after solidification is compact in structure, 30 to 70 MPa in compressive strength in one day, 60-150 MPa in compressive strength in 28 days and 100-1000 coulombs in electric flux, so the paint is quite good in chloride penetration resistance. Besides, the paint and concrete have quite good compatibility and quite high bonding strength which is 1.0-2.0 MPa in 28 days. By adopting mechanical operation, the inorganic anti-corrosive paint for the steel bar, disclosed by the invention, can be used for rapidly performing a large-area anti-corrosive treatment on the steel bar at a construction site and is especially applicable to the anti-corrosive treatment of the steel bar in marine concrete. The preparation method disclosed by the invention is simple, convenient and wide in application.

Description

technical field

[0001] The invention belongs to the technical field of building materials, and in particular relates to an inorganic anticorrosion coating for steel bars and a preparation method thereof. Background technique:

[0002] With the rapid development of engineering construction in our country, the application of basic engineering materials such as concrete, especially reinforced concrete, is becoming more and more extensive, and it plays a very important role in the national economic infrastructure. However, with the increase in the application of steel bars in concrete, the possibility of corrosion of steel bars in concrete due to various environmental factors has also increased rapidly. In winter, northern cities use a large amount of deicing agent, which leads to serious corrosion of road and bridge concrete by harmful salt, especially in the coastline area, because the chloride ions contained in the sea breeze and seawater penetrate into the pores of the concr...

Examples

Embodiment 1

[0030] 33.10% of hydraulic gelling material, 2.04% of modifier, 1.82% of plasticizer, 2.11% of superfine nano powder, 7.09% of active mixed material, 38.64% of aggregate, and 15.20% of mixing water. After weighing the raw materials accurately according to the proportion, stir with a mixer, add mixing water while stirring, after stirring for 5-10 minutes, stop the machine for 1-3 minutes, continue stirring for 1-2 minutes, and pour the stirred inorganic anti-corrosion coating on the steel bar Put it into the corresponding mold and cure it for 24 hours. After removing the mold, measure the compressive strength of the steel bar inorganic anti-corrosion coating for 1 day.

[0031] After testing, the compressive strength of the inorganic anticorrosion coating for steel bars is 41.3MPa for 1 day, 96.4MPa for 28 days, and the electric flux is 364 coulombs. The 28-day bond strength between the inorganic anticorrosion coating for steel bars and concrete It is 1.4MPa.

Embodiment 2

[0033] 38.73% of hydraulic gelling material, 3.28% of modifier, 2.14% of plasticizer, 3.57% of superfine nano powder, 4.23% of active mixed material, 30.54% of aggregate, and 17.51% of mixing water. After weighing the raw materials accurately according to the proportion, stir with a mixer, add mixing water while stirring, after stirring for 5-10 minutes, stop the machine for 1-3 minutes, continue stirring for 1-2 minutes, and pour the stirred inorganic anti-corrosion coating on the steel bar Put it into the corresponding mold and cure it for 24 hours. After removing the mold, measure the compressive strength of the steel bar inorganic anti-corrosion coating for 1 day.

[0034] After testing, the 1-day compressive strength of the steel inorganic anti-corrosion coating is 64.7MPa, the 28-day compressive strength is 118.2MPa, and the electric flux is 232 coulombs. The 28-day bond strength between the steel bar inorganic anti-corrosion coating and concrete It is 1.8MPa.

technical field

[0001] The invention belongs to the technical field of building materials, and in particular relates to an inorganic anticorrosion coating for steel bars and a preparation method thereof. Background technique:

[0002] With the rapid development of engineering construction in our country, the application of basic engineering materials such as concrete, especially reinforced concrete, is becoming more and more extensive, and it plays a very important role in the national economic infrastructure. However, with the increase in the application of steel bars in concrete, the possibility of corrosion of steel bars in concrete due to various environmental factors has also increased rapidly. In winter, northern cities use a large amount of deicing agent, which leads to serious corrosion of road and bridge concrete by harmful salt, especially in the coastline area, because the chloride ions contained in the sea breeze and seawater penetrate into the pores of the concr...

Examples

Embodiment 1

[0030] 33.10% of hydraulic gelling material, 2.04% of modifier, 1.82% of plasticizer, 2.11% of superfine nano powder, 7.09% of active mixed material, 38.64% of aggregate, and 15.20% of mixing water. After weighing the raw materials accurately according to the proportion, stir with a mixer, add mixing water while stirring, after stirring for 5-10 minutes, stop the machine for 1-3 minutes, continue stirring for 1-2 minutes, and pour the stirred inorganic anti-corrosion coating on the steel bar Put it into the corresponding mold and cure it for 24 hours. After removing the mold, measure the compressive strength of the steel bar inorganic anti-corrosion coating for 1 day.

[0031] After testing, the compressive strength of the inorganic anticorrosion coating for steel bars is 41.3MPa for 1 day, 96.4MPa for 28 days, and the electric flux is 364 coulombs. The 28-day bond strength between the inorganic anticorrosion coating for steel bars and concrete It is 1.4MPa.

Embodiment 2

[0033] 38.73% of hydraulic gelling material, 3.28% of modifier, 2.14% of plasticizer, 3.57% of superfine nano powder, 4.23% of active mixed material, 30.54% of aggregate, and 17.51% of mixing water. After weighing the raw materials accurately according to the proportion, stir with a mixer, add mixing water while stirring, after stirring for 5-10 minutes, stop the machine for 1-3 minutes, continue stirring for 1-2 minutes, and pour the stirred inorganic anti-corrosion coating on the steel bar Put it into the corresponding mold and cure it for 24 hours. After removing the mold, measure the compressive strength of the steel bar inorganic anti-corrosion coating for 1 day.

[0034] After testing, the 1-day compressive strength of the steel inorganic anti-corrosion coating is 64.7MPa, the 28-day compressive strength is 118.2MPa, and the electric flux is 232 coulombs. The 28-day bond strength between the steel bar inorganic anti-corrosion coating and concrete It is 1.8MPa.

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