Rebar cleaning is done manually metal brushes or mechanized way using a sandblasting machine. In order to reduce the effect of vibration on the adhesion of reinforcement to concrete, when removing damaged concrete around reinforcing bars, mechanical impact on the reinforcement with jackhammers or hammer drills is not allowed.

Figure 3 – Cleaning fittings

Damage to reinforcing bars by diamond discs is not allowed. The minimum cutting depth of concrete along the perimeter of the repaired area with reinforcing bars should be 15 mm, and the maximum should not exceed the thickness of the protective layer.

The exposed reinforcing bars must be completely exposed, and the gap between the prepared concrete surface and the bar must be at least 10 mm when the aggregate size in the repair material is up to 5 mm and at least 20 mm when the aggregate size is more than 5 mm.

Opened reinforcing bars are cleaned of rust using the methods indicated in Table 3.

If necessary, if the old reinforcement is unreliable or the coating thickness should be more than 20 mm, welded reinforcement is installed in accordance with the design. It must be fixed to the concrete being repaired, leaving space between the mesh and the surface: the EMACO layer above the reinforcement must be at least 10 mm.

Old fittings, as well as newly installed ones, must be cleaned to a cleanliness level of Sa 2 1/2 in accordance with the requirements given in Table 3, and treated with the anti-corrosion composition MASTERSIL 300. Instructions for the preparation and application of MASTERSIL 300 are given on pages 15 and 20.

Table 3

Rust removal method	Determination of purity degree		Note
Blasting and abrasive cleaning	Sal	Only scale, rust and surface layers incoherent with the base material have been removed.
Sa 2	Scale, rust and surface layers have been almost completely removed
Sa 2 1/2	Scale, rust and paint removed; Only residues remain on the surface of the steel, visible as “shading”.
Sa 3	Completely removed inspection without magnification: scale, rust and paint coatings
P Sa 2 1/2	Scale, rust and paint have been removed in accordance with the requirements of the degree of cleanliness Sa 2 1/2 - visible “shading” of the pores. Surface layers with high adhesion to the base remain. Between these zones there is an intermediate zone. The adhesion of layers located in the intermediate zone must be checked after applying the first layer of protective material.	Mandatory only for blast cleaning coated steel surfaces with partial coating remaining.

Continuation of table 3

Rust removal method	Determination of purity degree	Technical properties prepared metal surfaces. Pre-cleaning - if necessary. Secondary cleaning is always performed	Note
Cleaning manual or mechanical	St 2	Deleted upper layer with insufficient adhesion and scale. The rust has been removed so much that the surface of the steel after secondary cleaning has a slight metallic sheen.
Fire cleaning	F 1	Surface layers, scale and rust have been removed. The residues remaining on the surface became visible as “shading” of different colors.	Careful secondary mechanical brushing required
Etching	Be	The remains of surface layers, scale and rust have been completely removed.	Covers (surface layers) must be removed before etching.

3.2.4 Dust removal and surface moistening

Immediately before applying the repair composition, the surface must be cleaned and moistened manually or, to quickly saturate the surface with water, mechanically.

The surface is cleaned manually with metal brushes, then from dust by blowing air from a compressor equipped with a water and oil separator. After this, moisten the surface manually with a brush for 6 hours.

Mechanized surface cleaning is performed using a machine high pressure(at least 160-180 atm). No later than 30 minutes before the start of laying the repair composition, the same apparatus moistens the surface to be repaired until the concrete is completely saturated with water.

Excess water is removed from the surface compressed air from a compressor that has an oil separator or a foam sponge.

3.2.5 Requirements for trained concrete surfaces

Physical and mechanical requirements for concrete surfaces prepared for repair are established depending on the type of material and method of preparing the concrete surface.

When used for repair work concrete based on mineral binders, the physical and mechanical properties of the concrete being repaired must meet the requirements:

Strength of concrete at separation, not less than 1.5 MPa;

The fittings are often sold with traces of rust

Fittings are an important component of any modern building structure. Today it can very often be purchased with traces of rust.

The reasons for its appearance may be completely different, but we can say unequivocally that it is impossible to use such reinforcement for construction without cleaning it from rust.

Otherwise, you risk significantly reducing strength future design, and over time, its complete destruction if the rust continues to grow.

We recommend a product for cleaning and protecting fittings from rust

Degree of metal corrosion:

Minor coating on the surface. The color of the material and its weight do not change.
A dense layer of rust that can be easily removed with a brush.
Localized rust due to water ingress. The cross section of the rod may change slightly.
Rust with the presence of significant corrosion of steel. There is a possibility of a downgrade performance characteristics material.

If the rust layer is insignificant, then it will be enough to simply wipe the surface of the reinforcement with a rag (although, given its ribbed texture, this will not be easy).

In other cases, mechanical, thermal or chemical method cleaning fittings from rust.

Mechanical method. The mechanical method consists of cleaning the surface of the reinforcement using metal brushes or special machines. This is a rather complex and, moreover, polluting process.
Thermal method. rust removal is carried out by exposing the surface of the reinforcement to a flame gas burner. After cooling, the rust is easily removed. However, this method is not entirely suitable for reinforcement, since there is a high probability of violating its strength characteristics.
Chemical method. This method of removing rust from fittings is the most effective and very common both in production and at home. A special layer is applied to the surface of the reinforcement chemical composition, which removes rust from the metal surface and forms a protective film on it.

The easiest way to remove rust is with an aqueous solution of sulfuric acid and of hydrochloric acid in the presence of a methenamine inhibitor. The function of the inhibitor is to prevent the destruction of the metal from the action of acid, but it does not interfere with corroding the rusty layer at all.

It is effective to use a rust converter for these purposes. The product reacts with the damaged metal layer and converts it into a coating Brown. The composition of such products necessarily includes orthophosphoric acid, which forms iron orthophosphate from rust, covering the surface of the reinforcement.

One more chemical agent, which helps clean the fittings from rust is a rust solvent. It, unlike products containing orthophosphoric acid, does not create a film on the metal surface, but completely dissolves iron oxides, converting them into water-soluble salts. Cleaning is done by immersion. The advantages of the product are ease of use, effectiveness and low level contamination of the room in which the treatment is carried out.

LENIS No. 2 CLEANED THE FITTINGS PERFECTLY!

Professional concentrated acid cleaner for conversion and removing rust from fittings. Cleans fittings from rust, scale, plaque before your eyes!
To remove oils and re-preserve, click here
Contains a mixture of special acids that instantly react with rust, transform it, and give the original black color to the protected fittings. Forms an inhibitory layer that prevents the formation of rust. No further application of primer is required. In addition to the most important, orthophosphoric acid, at your request, it can contain nitric acid, which is better suited for ferrous metal and returns it to its original form.

WHERE CAN I BUY? - ONLY HERE! WE WILL DELIVER TO ANY CITY IN RUSSIA VIA T.K! WE WILL DELIVERY OURSELVES IN MOSCOW AND MO
tel: 8499 7030076; 89257054713 FREE: 8 800 5553652 e-mail: [email protected]

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TOLL FREE NUMBER FOR REGIONS 8 800 5553652

This is done like this: Send your details (if individual, then Passport data) on [email protected], we issue an invoice, you pay, our car delivers the goods to the company *BUSINESS LINES* or *ENERGY* or *KIT* and sends it to your city. A couple of days later they call you and say *You have a load, come and pick it up!* You come and pick up the product. That's it.

WRITE TO [email protected]

CALL 8499 7030076 AND FIND OUT THE PRICE! FROM THE REGIONS FREE: 8 800 5553652

MODE OF APPLICATION

Attention! It is advisable to shake before use!!! Used for local cleaning of rust from reinforcement surfaces. Apply to the surface to be cleaned with a roller or brush for 20 minutes and wash off with a sponge or brush. In case of significant deposits, the treatment should be repeated. Application with high-pressure apparatus is also possible. Cleaning is also possible by immersing the fittings in a container with a reagent.

In the presence of a methenamine inhibitor. The function of the inhibitor is to prevent the destruction of the metal from the action of acid, but it does not interfere with corroding the rusty layer at all.

It is effective to use a rust converter for these purposes. The product reacts with the damaged metal layer and transforms it into a brown coating. The composition of such products necessarily includes orthophosphoric acid, which forms iron orthophosphate from rust, covering the surface of the reinforcement.

To ensure durability of reinforced concrete and extend the service life reinforced concrete structures, it is necessary to process the reinforcement in accordance with all requirements.

Why is rebar treatment necessary?

Iron reinforcement under impact aggressive environment undergoes oxidation, becomes rusty and loses strength. Before laying it in concrete it must be treated with special means. Concrete pouring will not save the reinforcement if it is already susceptible to corrosion.

Reinforcement, made of durable steel, is a rather expensive building material. Therefore, it will be much cheaper to use a liquid to remove rust from reinforcement than to get a low-quality reinforced concrete structure with rotten reinforcement inside. Corrosion only begins its path on the surface, and then affects the entire cross-section of the reinforcement.

The fittings are not easy to clean because they have screw-shaped and profiled protrusions. The recesses between them must be cleaned most thoroughly in order to get as close as possible to building standards.

A special rust converter is best suited to protect fittings. This liquid for removing rust from fittings meets all requirements and has high protective properties against corrosion.

Neutral rust converter has enhanced inhibitors. Removes a layer of rust on a steel surface. It is used in various fields of construction, car repair and in domestic conditions.
Rust converters containing acid. With their help it passes chemical process cleaning metal surfaces from rust.

Phosphating converters consist of a solution of orthophosphoric acid, corrosion inhibitors and additives. When applied to fittings or other metal products, rust is converted into a protective cold film, which is a bunch of phosphate salts of iron, manganese and zinc (cold phosphating). This layer reliably increases the anti-corrosion and weather-resistant qualities of fittings and other metal products.

Advantages of chemical converters:

carry out pickling and impregnation of metals;
create a protective film as a result of cold phosphating;
very simple and easy to apply to the surface;
have increased adhesion to metal surfaces;
compatible with any brands of paints and varnishes.

How to apply products correctly

Rust on fittings may appear during its storage in warehouses and during transportation. How to treat already rusted fittings. It can be done manually, which requires a lot of physical effort. In production conditions, a mechanical cleaning method is used - sandblaster with a vacuum gun, pneumatic brush, etc.

Liquid for removing rust from fittings facilitates the processing process. The solution is easy to apply both manually and mechanically. The main thing is that the result meets the technological requirements. The reinforcement processed by the converter is ready for use. But acid-based rust converters are not suitable for reinforced concrete. Therefore, it is better to remove rust mechanically. This method is environmentally friendly and reliable.

how to remove rust from fittings without harming other materials

Reinforcement refers to steel rods with different cross-sections. There are smooth and periodic profile reinforcement. The fittings are made from high-strength types of steel. Reinforcement is used for the manufacture of reinforced concrete, as well as for strengthening metal structures.

Therefore, it is very important that the iron rods covered with ribs and cross projections are completely free of rust.

How to remove rust from fittings if it has penetrated between the protrusions and cannot be removed mechanically

Is rust dangerous for fittings? If light dusty rust has formed on the fittings, you don’t even have to remove it. Thanks to it, adhesion of metal to concrete occurs. But this version can lead to the destruction of a reinforced concrete structure if moisture penetrates into the concrete or if there are chlorides in the solution, which activate the process of metal corrosion. It’s still better to make a decision before laying concrete than to remove rust from the reinforcement.

Methods for cleaning fittings from rust

Mechanically Using a metal brush, sandpaper, or a grinding machine, you can remove the accumulated layer of rust.

Disadvantages: slow, labor costs, rust is not completely removed.

Application of corrosion inhibitors (moderators). Inhibitors contain phosphoric acid and react chemically with the metal. Iron phosphate is formed, protecting the metal from rust.

Disadvantages: inhibitors cannot be used for reinforcement that is poured with concrete: the acid will destroy the concrete as alkaline environment. Will be required additional expenses for another coating of the reinforcement with an anti-acid solution.

Acid-free rust converters. Remove rust from reinforcement without harming other building materials: the developers of acid-free rust converters took care of this. The composition of such a converter includes vegetable tannins, stabilizers and corrosion inhibitors, and functional additives.

Advantages of acid-free converters:

does not destroy concrete;
does not require washing;
completely replaces mechanical rust removal;
used even with a thick layer of rust up to 150 microns;
does not contain mineral acids and toxic products;
fireproof, does not catch fire;
guarantees protection of the metal from the moment of production until use in the next cycle for 18 days.

It is very easy to apply acid-free rust converter to reinforcement using a brush, roller, spray or dip method.

In production conditions, the last two methods are used to process large volumes of reinforcement.

Successful completion chemical reaction visible from the color - the brown color of rust changes to black.

If a very thick layer of rust is found on the reinforcement, you need to treat the rods with a converter 2-3 times without waiting for it to dry. There will definitely be an effect.

The treated reinforcement can be placed in concrete or painted with paint after the converter has completely dried.

Buy a product for cleaning fittings from rust

You can buy a product to combat corrosion on fittings in specialized stores. You can get complete information about acid-free rust converters on our website. Consultants will help you determine the quantity of goods and its cost. Quality guarantee is provided by modern production technology of acid-free rust converters.

Purpose:
Reinforcement is an acid-free rust converter, which is intended to modify rust that forms on the surface of ferrous metal before applying paintwork or concreting.
Material Armaturite- a complex composition based on plant tannins, stabilizers, functional additives and corrosion inhibitors.
Reinforcement is used to transform and stabilize corrosion that forms on the surfaces of reinforcing steel, rolled metal, pipes, steel parts of reinforced concrete structures before the use of mastics, paintwork materials or concreting. The product can replace the mechanical method of cleaning the surfaces of metal products from corrosion products.
Armaturite Recommended for use on reinforcement bars classes A-I, A-II, A-III, A-IV. It is acceptable to use the composition for treating tightly adhered rust with a thickness of corrosive products up to 150 microns (when applied in two or three layers).
At the interoperational stage of production, the converter provides reliable protection metals for a period of up to eighteen days, provided there is no rain, snow (direct precipitation). The product does not contain toxic substances or mineral acids and is not flammable.
Corrosion Converter Armaturite used in construction industry during the construction of reinforced concrete structures, production of reinforced concrete products (RCP), preparatory stage(when preparing products for sale painting works), when carrying out restoration and repair work in different areas industrial production and domestic operating conditions.
The composition is also used in the implementation current repairs machines, metal structures, mechanisms in order to increase their service life.
Armaturite when applied, it converts iron oxide into inactive corrosive compounds, which are characterized by increased adhesion to metals. The conversion process takes place in a neutral environment (pH 5.0-6.0).
The product being treated does not need to be washed with water after applying the composition. Converter improves functional characteristics concrete and extends their service life, provides anti-corrosion resistance, durability, adhesive strength and weather resistance of the system paint coating.

Mode of application:
The reinforcement is applied to a dried surface, previously cleaned of accumulations of dust, oils and loose corrosion. The product must be stirred before use. The converter is applied using a roller, brush, dipping or spraying. About successful completion The reaction is indicated by a change in rust color from brown to black. The surface, depending on the thickness of the corrosion, is treated one to three times until the rust turns black. Subsequent layers of the composition are applied at intervals of at least fifteen minutes to wet-to-wet treated surfaces. Painting or concreting must be carried out after completely dry funds (from one to those hours, depending on temperature indicators). Temperature application: from +4°C.

Consumption:
Converter consumption is 0.1-0.15 kg/m2 when applied with a brush in two or three layers.

Precautionary measures:
When carrying out work Use individual means protection. In case of contact with eyes, rinse with water.

Storage:
Store the composition in a tightly closed container, protecting it from heat and direct sunlight. Do not heat. Keep away from fire and moisture. Storage temperature from 0°C to +35°C. After defrosting, it does not lose its properties. Guarantee period storage - 12 months from the date of manufacture.