Difference between fittings A1 and A3. Characteristics and application in construction
Reinforcement is the basis of concrete walls, screeds and columns. This important element experiences all the main loads and bending moments, preventing deformation and destruction of the concrete base.
Metal rods of different diameters, which have a circular cross-section, are used as reinforcement. There are two main types of reinforcing metal rods: A1 and A3.
To understand the difference between A1 and A3 fittings, as well as their scope of application, it is necessary to familiarize yourself with their main characteristics and consider their advantages and disadvantages.
Explanation of markings
Marking of reinforcing bars is usually done using letter designations. The letters indicate the exact method by which the reinforcement was produced. So, for example, the presence of the letter A in the name indicates that the product was made using the hot or cold rolling method.
If we compare both methods, it is worth noting that the steel obtained by cold rolling has increased strength characteristics and has greater hardness. The number usually denotes the degree of fluidity of the steel used in the reinforcement; it determines the main difference between the grades of metal. The yield coefficient depends on the maximum stress, which causes the metal to begin to deform.
That is, the higher this indicator, the greater the strength of the rod itself. So, for example, A440 steel has a greater safety margin compared to A240.
When building structures made of reinforced concrete, it is necessary to achieve the best strength of the entire structure, using elements with minimal mass. One solution is to reinforce the structure using a steel frame, for the assembly of which reinforcement of various cross-sectional diameters is used. It can be in the form of skeins or rods.
Each type of reinforcement, regardless of its profile, can be subjected to separate temperature treatment. This can be understood by the addition of “At” at the end of the abbreviation. The reinforcement metal can be cleaned of excess impurities and have a uniform distribution of carbon, which increases the quality of welded joints (a “C” is added to the abbreviation). Copper can be added to the metal in an amount of up to two percent to improve its anti-corrosion properties (at the end of the abbreviation “K”).
Difference between fittings A1 and A3
The main types used in construction are A3, as well as A1 reinforcement, GOST 30136-94. Sometimes you can find other names. For example, A1 fittings are often found under the name A240, and A3 – A400.
The weight of reinforcement A1 and A3 is approximately the same, however, the main difference between these types of reinforcement is that A1 has a smooth surface, and A3 has a corrugated surface. Corrugation provides better contact with concrete. Due to the presence of a corrugated surface on A3, it has better reinforcing qualities compared to smooth reinforcement A1.
The disadvantages of A3 include the appearance of additional stresses due to the need for an additional rolling cycle, which is necessary to form a corrugated surface.
Another disadvantage is the reduction in the effective cross-section of the reinforcement with a constant weight per linear meter, as well as a higher cost due to the complexity of its production. Strength decreases by 6% with an asymmetrical position of the corrugation pattern compared to round reinforcement.
There are differences between reinforcement A1 and A3 in terms of the type of steel used. Typically, steel with a low carbon content in its composition is used for the manufacture of materials. For the manufacture of A3 reinforcement, steels with increased ductility and low carbon content are used. A1 reinforcement is made from stiffer and harder steels. Also, according to GOST, variety A1 should not have corrugation.
The cross-sectional diameter of the reinforcement bars, regardless of the profile, usually varies between 8-25 millimeters. When constructing larger structures, such as bridges and high-rise buildings, reinforcement with a diameter of 40 millimeters is used. The composition of the material with a smaller cross-section includes mild steel that is more deeply purified from impurities. For large diameter fittings, any type of steel with a low carbon content can be used.
Application of fittings
Let's talk about the difference between A1 and A3 fittings in terms of application. A1 is widely used for reinforcing concrete structures in any form, be it a mesh or a complex frame. Smooth reinforcement is also actively used in the construction of any structures that have an auxiliary value (fences, products in the form of gratings, fences, etc.).
A3 reinforcement, which is corrugated, is mainly used for the construction of simple, lightweight and high-strength frame structures made of concrete. This variety is not used in the construction of structures that perform an auxiliary function.
Source: https://FB.ru/article/353712/otlichie-armaturyi-aia-harakteristiki-i-primenenie-v-stroitelstve
A3 fittings: characteristics, weight, diameter, GOST:
When carrying out any construction or repair work, one of the main materials is A3 reinforcement. It is used as load-bearing reinforcement in the construction of reinforced concrete structures, to strengthen various metal structures. The main task of such products is to improve the strength of concrete products.
Types of fittings
Reinforcement is a rolled metal product. Depending on its purpose, conditions of use and type of steel, it is divided into six classes. One of them is A3 (A400) fittings. There are two types of reinforcement profiles: smooth (constant cross-section) and corrugated (ribbed).
The smooth profile is mainly produced according to individual orders. Corrugated reinforcement A3 has two longitudinal ribs, which are made at equal intervals at the same angle to the longitudinal line of the rod, and two transverse protrusions. Thanks to the periodic profile, better adhesion of the reinforcing bar to the concrete is ensured.
Production methods
A3 reinforcement is manufactured by hot rolling. If the products are additionally hardened by heat treatment, the result is thermally strengthened reinforcement, designated At.
When cold, reinforcing bars can be strengthened by drawing. Such rods are used for the production of prestressed reinforced concrete structures.
The letter C is added to the name of the fittings suitable for welding; the letter K is resistant to corrosion cracks.
Diameter
A3 reinforcement can have the following rod diameters: from 6 mm to 40 mm. In this case, products from 6 mm to 10 mm are produced in coils, which are then unwound and cut into pieces 6 meters long, or in the form of rods. With a diameter of 12 mm and above, reinforcement is produced only in the form of rods 12 m long. In the construction of buildings and structures, A3 reinforcement 12 mm, 14 mm, 18 mm is most often used. As mentioned above, reinforcement products are produced in coils or in the form of rods.
The marking of various reinforcing bars must include their diameter, reinforcement class and GOST number according to which they are manufactured. For example, 10-A-3 GOST 5781-82 - this is how an A3 reinforcement rod with a diameter of 10 mm is designated.
A3 fittings: weight
In most cases, the amount of material required is calculated in linear meters. But for delivery to the work site, a weight calculation is often required, and you also need to know what volume the A3 reinforcement has. Weight is calculated based on the diameter of the product.
| Diameter, mm | Quantity m in 1t | Area, sq. cm | Weight 1 m, t |
| Rod d=6 | 4 504,50 | 0,283 | 0,000222 |
| Rod d=8 | 2 531,65 | 0,503 | 0,000395 |
| Rod d=10 | 1 620,75 | 0,785 | 0,000617 |
| Rod d=12 | 1 126,13 | 1,131 | 0,000888 |
| Rod d=14 | 826,45 | 1,540 | 0,001210 |
| Rod d=16 | 632,91 | 2,010 | 0,001580 |
| Rod d=18 | 500,00 | 2,540 | 0,002000 |
| Rod d=20 | 404,86 | 3,140 | 0,002470 |
| Rod d=22 | 335,57 | 3,800 | 0,002980 |
| Rod d=25 | 259,74 | 4,910 | 0,003850 |
| Rod d=28 | 207,04 | 6,160 | 0,004830 |
| Rod d=32 | 158,48 | 8,040 | 0,006310 |
| Rod d=36 | 125,16 | 10,180 | 0,007990 |
| Rod d=40 | 101,32 | 12,570 | 0,009870 |
Technical requirements
For the production of class A3 fittings, carbon or low-alloy steel grades 35GS or 25G2S are used. In terms of chemical composition, carbon steel must comply with GOST 380.
When producing low-alloy steel, the presence of carbon is necessary: 35GS - from 0.3% to 0.37%, 25G2S - from 0.2% to 0.29% and manganese: 35GS - from 0.8% to 1.2%, 25G2S – from 1.2% to 1.6%. In addition, the composition of the 35GS brand also includes sulfur - 0.045% and phosphorus - 0.04%.
In addition, the addition of titanium during manufacturing is allowed: from 0.01% to 0.06%.
Mechanical characteristics of class A3 fittings:
- The yield strength is not less than 40 kgf/sq.m. mm.
- Temporary tensile strength is not less than 60 kgf/sq.m. mm.
- Relative elongation – 14%.
On the entire surface of the reinforcing bar, including protrusions and ribs, cracks, ruptures, rolling sunsets and caps are not allowed.
Application area
The fittings are used for civil construction of buildings and structures, industrial construction. A3 reinforcement is the most common and popular class, especially for use in massive and heavy structures. Scope of use:
- Construction of metal structures.
- For reinforcing concrete products.
- Strengthening floors and walls of buildings and structures.
- Reinforcement of reinforced concrete products.
Such products are used for reinforcing concrete in order to give it additional rigidity, as well as for the production of various welded metal structures: grilles for windows and doors, metal fences, reinforcing mesh.
The use of reinforcing bars extends the operational life of buildings. The strength and durability of the structures being built depends on the quality of the reinforcement used. A3 has good technical indicators, such as strength, elasticity of steel, and its weldability.
A3 reinforcement is also used for monolithic concreting.
Rods of size d=10 mm are used as the main reinforcement when used in low-rise construction, and as clamps for beams and crossbars in high-rise construction. A3 with a diameter of 12 mm is used in main load-bearing structures, foundations and monolithic walls. Due to its larger diameter, it has a smaller laying step - 20 cm. For the foundation, rods of at least 10 mm in size are used. The larger the diameter of the reinforcing bars, the stronger the foundation frame.
A3 fittings: GOST standards
A3 reinforcement is produced in accordance with GOST 5781-82 “Hot-rolled steel for reinforcement of reinforced concrete structures”.
Since the quality of the resulting product depends on the source raw material, and the strength and reliability characteristics of future buildings and structures depend on it, GOST imposes strict requirements on steel, which is used for the manufacture of reinforcement products.
At3 reinforcement is produced in accordance with GOST 10884-94 “Thermomechanically strengthened reinforcing steel for reinforced concrete structures.” It replaced the previously valid GOST 10884-81 “Reinforcement rod steel thermomechanically and thermally strengthened with periodic profile.”
A400S and A500S fittings
One of the most popular types of A3 fittings can be called A400C and A500C. Such products are produced with diameters ranging from 6 mm to 36 mm and lengths up to 11.7 m. The composition includes titanium, silicon, chromium, which significantly increases the strength of steel.
The scope of use of these types of reinforcement is the reinforcement of reinforced concrete products. When bars are arranged longitudinally in concrete, reinforcing bars protect it from cracks and work in tension.
With transverse cracking, they prevent inclined cracking from forming and work on compression.
Comparative table of characteristics of A500C and A400C fittings| Mechanical properties and scope | А500С | А400С |
| Tensile strength, N/sq. mm | 600 | 590 |
| Ultimate fluidity, N/sq. mm | 500 | 390 |
| Relative extension, % | 14 | 14 |
| Bending angle with a mandrel diameter equal to 3 rod diameters | 180 degrees | 90 degrees |
| Calculated tensile strength 6 - 8 mm, N/sq. mm | 450 | 355 |
| Calculated tensile strength 10 - 40 mm, N/sq. mm | 450 | 365 |
| Calculated compressive resistance, N/sq. mm | 450 | — |
| Calculated resistance, N/sq. mm | 500 | 390 |
| Use at sub-zero temperatures | Up to 55 degrees | Up to 40 degrees |
| Using arc tack welding of cruciform joints | Maybe | Not allowed |
Most buildings and structures are currently being constructed from reinforced concrete products or monolithic concrete. The use of reinforcement is an integral part of this process.
With the development of new technologies, this material is also being improved, and more high-tech varieties are appearing. The use of A3 fittings will continue to be constant in the future; its demand is only increasing. When A3 reinforcement is used in a building structure, its quality increases significantly.
Source: https://www.syl.ru/article/312499/armatura-a-harakteristiki-ves-diametr-gost
A3 fittings - table of weights and assortment according to GOST 5781-82
Class A3 (A400) reinforcement is a type of long steel produced by hot rolling in accordance with GOST 5781-82. The surface of this product has longitudinal and transverse protrusions located along a helical line. This shape ensures effective adhesion of steel rods to the hardening concrete mixture. At the customer's request, rods of this class can have a smooth surface.
Technical characteristics and areas of application of A3 fittings
The products are made from low-alloy steel grades 35GS, 25G2S, 32G2Rps. Due to the increased manganese content, the material is resistant to low temperatures. This type of rolled product is capable of withstanding high operational static and dynamic loads. To increase the service life of fittings, galvanizing or aluminum galvanizing is usually used by hot, electrochemical or thermal diffusion methods.
Main physical characteristics:
- yield strength – 390 N/mm2;
- temporary tensile strength – 590 N/mm2;
- relative elongation – no less than 14%.
Thermo-mechanically strengthened reinforcement with similar tensile strength - 550-600 N/mm2 - is manufactured in accordance with GOST 10884-94.
Product performance properties:
- strength;
- the ability to give the required shape;
- good weldability (without restrictions) of products made from steels with low carbon content, high strength of welded joints.
Due to their technical characteristics, A3 class reinforcing bars are used:
- in monolithic construction and production of reinforced concrete products for the production of flat and spatial reinforcement frames;
- for creating metal structures for various purposes;
- for reinforcing floor screeds, paths, blind areas;
- to strengthen road surfaces;
- for the manufacture of gratings, fences, nets;
Assortment of fittings A3
Products are produced in the diameter range of 6-40 mm. The profile number of periodic profile rods indicates the nominal diameter, which is equal to the diameter of smooth rods of equal cross-sectional area. Rolled products with a cross-sectional diameter of up to 10 mm can be produced in coils or rods, more - only in rods. The coils are formed in such a way that there are no kinks. The length of the segments is 6-12 mm. The rods should not be bent by more than 0.6% of the total length.
Calculation of the mass of a batch of reinforcing bars can be done using a table that presents the theoretical masses of 1 linear meter. They are calculated based on the average density of steel, which is assumed to be 7.85 kg/m3. When multiplying the mass of a linear meter of a product of the corresponding diameter by the total footage, we obtain the weight of the batch.
Table of cross-sectional areas and theoretical weights of 1 m of A3 reinforcement
| Diameter, m | Cross-sectional area, cm2 | Weight 1 m, kg | Diameter, m | Cross-sectional area, cm2 | Weight 1 m, kg |
| 6 | 0,283 | 0,222 | 20 | 3,14 | 2,47 |
| 8 | 0,503 | 0,395 | 22 | 3,8 | 2,98 |
| 10 | 0,785 | 0,617 | 25 | 4,91 | 3,85 |
| 12 | 1,131 | 0,888 | 28 | 6,16 | 4,83 |
| 14 | 1,54 | 1,21 | 32 | 8,04 | 6,31 |
| 16 | 2,01 | 1,58 | 36 | 10,18 | 7,99 |
| 18 | 2,54 | 2,0 | 40 | 12,57 | 9,87 |
Source: https://TreydMetall.ru/info/armatura-a3-tab-vesov
How much does a meter of A3 reinforcement weigh?
Reinforcement is a set of interconnected elements that, when working together with concrete in reinforced concrete structures, perceive tensile stresses (although they can also be used to strengthen concrete in a compressed zone).
The main application of periodic profile reinforcing steel is in the construction of foundations and walls of buildings and structures made of monolithic concrete. When carrying out concrete work, a significant investment of time and money requires the installation of a reinforced frame to reinforce the structure.
The weight of a meter of reinforcement is presented in the table of the ratio of diameter and weight of 1 m. Knowing the weight of reinforcing steel according to GOST 5781-82, you can estimate the reinforcement coefficient of the structure (the ratio of the mass of the reinforcement to the volume of concrete).
A linear meter of reinforcement is individual reinforcing bars of a smooth and periodic profile 1 meter long, the weight of which depends on the diameter of the reinforcing steel GOST 5781-82 (from a range of sizes - 6, 8,10, 12, 14, 16, 18,20, 22, 25 , 28, 32, 36, 40, 45, 50, 55, 60, 70, 80 mm).
Construction organizations use reinforcement manufactured in Ukraine, the weight of which meets the requirements of GOST, since domestic reinforcing steel is of sufficiently high quality and complies with all GOSTs and standards.
The weight of the reinforcement is selected depending on the types, diameter sizes (see table - Specific weight of reinforcement in a linear meter) and scope of application.
The weight of a linear meter of reinforcement depends on the shape of the surface of the periodic profile: corrugated or smooth. Protrusions in the form of ribs, corrugations on the surface of periodically profiled reinforcing steel bars or wire steel significantly improve adhesion to concrete.
Depending on the manufacturing technology, reinforcing steel for reinforced concrete structures is divided into hot-rolled rod and cold-drawn wire.
The weight of 1 m of hot-rolled reinforcement does not depend on its basic mechanical characteristics, which are divided into six classes depending on the strength of the metal and steel grade, with the symbol: AI, A-II, A-III, A-IV, AV, A-VI .
Reinforcing steel class
22Kh2G2AYu, 22Kh2G2R, 20Kh2G2SR
For example, construction reinforcement A3 is used to strengthen concrete structures of prefabricated buildings. The actual weight of the reinforcement consists of the mass of the reinforcement cages of the building element, which are then poured with concrete mortar over the formwork.
The production of reinforcing steel in Ukraine is carried out using technologies developed in Soviet times in the field of metal processing, and, as a rule, on equipment inherited from the USSR, and that is why domestic manufacturers sell reinforcing steel at a fairly affordable price with good quality and compliance with GOST requirements .
Imported analogues of fittings have a higher price. Before being sold from metal warehouses, fittings in Ukraine undergo step-by-step quality control during the production process, which guarantees high quality that meets state standards.
What is the weight of the reinforcement?
Weight of reinforcing steel . required for purchase is calculated by multiplying the total length of all rods by the weight of a linear meter of reinforcement (see weight table 1m).
Reinforcing steel weight table - How much does 1 m of reinforcement weigh?
Weight of 1 meter of reinforcement
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Greetings. I'm interested in how the weight of A3 reinforcement relative to a linear meter is calculated? We are going to build a large house for two families. Need your advice. Thank you.
Answers from forum users and experts to the question: What is the weight of A3 fittings per linear meter?
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