Online calculator for calculating the weight of reinforcement. Specific gravity of reinforcement of all diameters

Knowing the weight of one linear meter reinforcement is required to calculate the amount of material of a certain diameter per ton and its weight in the future building structure. This value is standardized and varies depending on the cross-section of the rods. The minimum grade for prestressing and load-bearing elements made of concrete is corrugated reinforcement with a diameter of 12 mm, as a result, it is the most in demand. Scope of application includes road construction, production of reinforced concrete products (including piece goods), welded frames and meshes.

Material calculation

The standard weight (mass) of 1 meter of round reinforcement with a diameter of 12 mm is 0.888 kg, this parameter is standardized according to GOST 5781-82. Accordingly, one ton includes 1126.12 m. It is easy to check this value or find it for rods of a different diameter; basic formulas relating mass, specific gravity and dimensions are used for calculation:

M p.m. =V·ρ, where:

• V is the volume of one linear meter, obtained by multiplying the cross-sectional area of ​​the rod (3.1415·D^2/4) by its length (in our case, 1 m). For reinforcement with a diameter of 12 mm V=0.000113 m 3 ;
• ρ – steel density, standard value is 7850 kg/m3. Thus, one l.m. with a diameter of 12 mm it weighs 0.888 kg.

The specified formula is also used to determine the total length of the purchased reinforcement, taking into account its weight. Of course, the calculation results are averaged; in reality, the rods do not have a perfectly round cross-section, but a corrugated surface. But the data obtained is sufficient to determine and verify the required amount of material. There are standards regulating the minimum permissible proportion of longitudinally placed reinforcement in reinforced concrete products; for example, for a monolithic foundation strip it is 0.1% of the cross-sectional area. In general, the percentage of steel in reinforced concrete products is quite small, but taking into account the fact that its specific gravity exceeds the density of concrete at least three times, the total mass of the frame or mesh needs to be known and taken into account.

An important nuance: the actual weight of 1 meter 12 mm of reinforcement does not always coincide with the calculated one. The parameter is controlled by GOST, but taking into account the manufacture of products from different types steel, differences in the size of the ribs, the deviation varies from 0.2 to 3% in both directions.

When purchasing rods with a fixed length individually (in small batches), this fact does not play a special role, but when ordering in bulk, you need to double-check how much the 12 mm reinforcement weighs, in particular, one meter of it. Responsible suppliers indicate this value in their price lists; in fact, each manufacturer has its own.

Other characteristics taken into account

In addition to knowing the weight and footage of reinforcement in one ton, when choosing, pay attention to the following indicators:

• Parameters of the ribs on the profile: dimensions, pitch, angle of inclination, width.
• The length of the rods and the form of delivery (in coils or in the form of measured sections).
• Type of rental – for strengthening concrete building structures hot-rolled bars are required (read about).
• Type of steel, its yield strength, admissibility of use in welding joints.
• Temporary tensile strength.
• The amount of relative elongation (within 14%).

Of all the classes offered in private and residential construction, the most in demand is A3 reinforcement made of A400 or A500C steel. The latter is the cheapest to build due to the reduced content of alloy metals and is considered almost universal. It welds without problems, provides excellent adhesion to concrete, has good corrosion resistance, toughness and strength. A400 weighs the same (0.888 kg/l.m), it is recommended for strengthening particularly stressed structures; the connection of the rods to each other is carried out exclusively by viscous.

Products are sold in dimensionless coils or in the form of rods from 6 to 11.7 m; if necessary, they are cut into pieces of the required size at small retail outlets.

The cost of one meter of 12 mm reinforcement varies from 29 to 32 rubles and depends on the type of steel, season and others market factors. Most often, the price is indicated for one ton (from 30,000 rubles and above), the larger the purchase volume, the lower the acquisition costs.

The scope of application of fittings is the construction industry. This type metal products are produced in the form of rods, used as the main part that serves to strengthen reinforced concrete structures. The metal takes on the main tensile and bending loads, making it possible to impart strength, reliability and durability to a reinforced concrete structure.

Characteristics of metal rods A12

Reinforcement with a cross-section of 12 mm is in greatest demand due to its convenience and lightness. And when knitting frames, the necessary rigidity of the product appears. During the construction of suburban brick houses applies strip foundation, the construction technology of which requires the use of reinforcement with a small diameter. In such cases, twelve-millimeter rods are most suitable.

During the production of reinforcing bars marked “A12”, GOST 5781-82 is complied with. The characteristics of A12 reinforcement according to their intended purpose are divided into prestressed and non-tensioned. Depending on the specifics technological process, products are classified into the following types:

Types of fittings depending on manufacturing technology

• cold drawn– reinforcing wire intended for the manufacture of reinforced mesh;
• hot rolled– steel rods with a round cross-section, used for reinforcing structures.

These products are made from different types steel, the choice of which depends on the requirements and area of ​​application of the future product. Reinforcement with a diameter of 12 mm is found with a smooth profile, which corresponds to class A1, and with a corrugated surface, corresponding to the A3 marking. Rolled metal is supplied by manufacturers in rods or coils.

Scope of application of reinforcing bars

Twelvemm rebar is widely used in the following areas:

Application of 12 mm reinforcement in construction

• frame-monolithic construction;
• installation of support frames;
• reinforcement of concrete structures;
• installation of canopies and stairs.

Also metal rods can be used as an anchor when pouring a columnar foundation. Rolled metal 12 mm is used to overcome deformation, form the basis of the frame, and connect individual elements, including those with a transverse arrangement.

Weight per meter

The weight of reinforcement products is influenced by various factors, among which the most significant are the following:

• diameter of the metal rod;
• surface type – smooth or with transverse corrugation;
• metal class.

Russian specialists use specially designed tables to calculate the weight of metal products, the basis of which is GOST R-52544. In accordance with this State Standard, the weight of a linear meter of reinforcement 12 is 0.888 kg.

Without using special tables, calculating the weight of the reinforcement will not be difficult. Weight is equal to the volume of the body multiplied by the average specific gravity. Volume is calculated using the formula: cross-sectional area multiplied by length. According to standards, the unit of measurement is the meter.

Thus, cross-sectional area = Pi * radius squared (radius equal to half diameter). S = 3.14x0.006 2 = 0.00011304. Respectively weight = 0.00011304x7850 = 0.8874, Where 7850 – standard indicator of the average specific gravity of twelve-millimeter reinforcement.

If you have access to the Internet at hand, then calculating the mass of 1 meter 12 mm of reinforcement is even easier, using special calculators that allow you to calculate reinforcing products of any brand and thickness.

How many meters of twelve-millimeter reinforcement in one ton

The tables, developed taking into account GOST for fittings, provide the following data on the number of meters contained in a ton of rolled metal:

• diameter 5 millimeters– 5347 meters;
• 6 mm– 4504 m;
• 8 – 2531;
• 10 – 1620;
• 12 – 1126;
• 14 – 826;
• 16 – 633.

From the excerpt of the table values ​​it is clear that one ton contains 1126 meters of reinforcement with a cross-section of 12 mm. Standardized indicators are aimed at facilitating the process of calculating the number of reinforcing bars required to create various types foundation or other structures.

Advantages of 12 mm reinforcement

Twelvemm hardware have a number of advantages manifested in the following areas:

• high level of strength of frames made using reinforcing bars;
• sufficient plasticity of the material;
• minimal risk of corrosion damage;
• high degree of resistance to influences such as chemical, thermal, mechanical;
• wide possibilities for various frame configurations;
• use in stressed reinforced concrete structures.

The results of calculations carried out using tables, formulas and calculators are average values, since in reality reinforcing bars do not have a perfectly round cross-section. The data obtained will be sufficient to determine the required quantity of rolled metal.

An important point in calculations is the fact that the calculated and actual weight of 12 mm reinforcement may differ from each other. Despite the careful control of GOST, metal rods are made from various types steel and different surfaces, and therefore the deviation of values ​​varies in the range of 0.2–3%.

Very often, both the customer and the foreman need to find out the exact weight of the reinforcement that is used to carry out any work. The formula for calculating the weight of reinforcement is very simple - the length of the reinforcement multiplied by the weight of a linear meter of reinforcement. Everything is quite simple here. For clarity, below is presented summary table specific gravity of reinforcement with different diameters, which will help you determine such a parameter as the weight of a linear meter of reinforcement.

Detailed table of weight of 1 meter of reinforcement.

Reinforcement weight 5 mm ~ 0.186 kg/m

Reinforcement weight 6 mm ~ 0.222 kg/m

Reinforcement weight 8 mm ~ 0.395 kg/m

Reinforcement weight 10 mm ~ 0.617 kg/m

Reinforcement weight 12 mm ~ 0.888 kg/m

Reinforcement weight 14 mm ~ 1,210 kg/m

Reinforcement weight 16 mm ~ 1,580 kg/m

Reinforcement weight 18 mm ~ 2,000 kg/m

Reinforcement weight 20 mm ~ 2.470 kg/m

Reinforcement weight 22 mm ~ 2.980 kg/m

Reinforcement weight 25 mm ~ 3.850 kg/m

Reinforcement weight 28 mm ~ 4.830 kg/m

Reinforcement weight 32 mm ~ 6.310 kg/m

Reinforcement weight 36 mm ~ 7.990 kg/m

Reinforcement weight 40 mm ~ 9.870 kg/m

Reinforcement weight 45 mm ~ 12.480 kg/m

Reinforcement weight 50 mm ~ 15.410 kg/m

An example of calculating the weight of linear reinforcement

The formula for calculating the number of meters of reinforcement in 1 ton is also very simple. It is enough to divide 1t (1000 kg) by the weight of 1 meter of reinforcement. Below we give several examples of calculating the number of meters in 1 ton of reinforcement.

1000 kg / 0.222 kg/m = 4504 m in one ton of reinforcement with a diameter of 6 mm. In the same way, you can find out the number of meters per ton of reinforcement for any other diameter.

In the article, the weight of a meter of reinforcement is indicated approximately for each manufacturer. For more accurate calculations of the weight of the reinforcement, ask the seller for documents and product specifications.

Knowing the approximate figures, you can already calmly determine whether the seller is trying to deceive you on the weight or length of the fittings.

All information is taken from the guest State standard USSR - weight of reinforcement GOST 5781 82

All information about how much reinforcement bars weigh is contained in the table of reinforcement weights. The weight of the reinforcement is determined based on the weight of 1 meter. The weight of the reinforcement, the table determines not only the weight of one linear meter, but also indicates the number of meters per ton of this rolled metal. The weight of the reinforcement depends on the diameter of the rolled product, with or without corrugations.

Reinforcement classes

Reinforcing bars are divided into:

Weldable, designated by the index C;

Resistant to stress corrosion cracking, designated by index K;

Not weldable, without index C;

Not resistant to corrosion cracking, not having a K index.

The weight of reinforcing bars depends on the diameter; classification does not affect the weight of a linear meter of reinforcement.

Currently, the industry produces reinforcing bars without the “C” index. Such rolled steel is poorly welded; at the welding site it becomes brittle, which can reduce the strength of the frame. It is usually connected using wire. For private construction, the following classes are most often used: transverse with a smooth surface with the designation A240 (Al); longitudinal and transverse - A400С (Аll), А500С (Аll).

Reinforcing steel with a diameter of up to 12 mm can be supplied in coils. The weight of the reinforcement, the table provides information for both bars and coils. All reinforcement diameters: small and large are made with rods having a length of 6 to 12 m, measured or unmeasured. Also often used welded mesh, intended for reinforcing floor slabs, foundations, walls, etc.

Depending on the conditions of use, they are divided into:

Hot-rolled, which after production is not subjected to further hardening, mechanical properties are provided chemical composition become;

Heat-strengthened, which is subjected to heat treatment to increase strength properties (increased strength characteristics of reinforcing steel are achieved by hardening).

The weight of reinforced and non-reinforced reinforcement depends on the diameter.

Properties are associated with:

The magnitude of the voltage;

Plastic properties of the material;

Stability of the structure.

Reinforcing bars have:

Durability and reliability;

Ability to withstand different temperatures;

Corrosion resistant.

It is made from steel 3, St5, St10GT, St25G2S, St35GS, St30KhG2S, St60GS, St80S, St20KhG2Ts, St23Kh2G2Ts, St20KhGST, St23Kh2G2T, etc. with diameters from 6 to 40 mm. 1 meter of reinforcement with a diameter of 6 mm weighs 0.222, and 4504.5 meters fit in a ton of rolled metal. Reinforcement 12, the weight of a linear meter is 0.888 kg, and a ton of 12mm rolled steel contains 1126.13 meters. 1 meter of 40-gauge reinforcement weighs 9.87 kg, and 1 ton of reinforcement contains a little more than 101 meters of 40-gauge rebar.

The most important purpose of this type rolled metal is used for reinforcing floors, walls, slabs, blocks, tie rods, and electric poles. The most popular type is rolled steel with diameters of 8-12 mm. Its use is more efficient, since a ton of reinforcement with a smaller diameter has a greater length. Widely used in everyday life and agriculture. It is used to make posts for fences, frames, covers, and arches for greenhouses. In addition, such rolled products are used as spare parts and components in mechanical engineering and machine tool building, and the mining industry.

When knitting frames, meshes, as well as when constructing a foundation, the main element is reinforcement. As for private construction, one of the most in demand here is rolled metal with a diameter of 12 millimeters. Favorable ratio of strength and affordable price allows the use of 12 mm reinforcement in the construction of a private house.

Why do you need to know the weight of rolled metal? This value will be needed to estimate the cost of construction work at different stages. Usually the weight is already calculated in the project for each structure where rolled metal A12, A3 or any other grade is used. If you plan to do the construction calculations yourself or just want to understand this point in detail, then this material will answer all the questions. After studying the article, the reader will be able to independently carry out calculations and find out the weight of reinforcement 12 mm, A3 or another brand.

The calculation is performed in linear meters - special quantities usually used in construction work. The table also shows the weight of one linear meter. At the same time, reinforcement is sold by weight, and not by length. The builder's task is quite simple: find out how many meters are required for all structures, and then convert them into units of mass. Below is detailed and simple table, which will help you find out the weight of one linear meter.

In this table you need to find the required diameter (D), in this case it is 12 mm. In the second column D is indicated - this data is not particularly needed, and converting 12 mm is quite simple (you need to divide 12 mm by 100, the result is 0.12 m). The third column of the table is the most important - the mass m per kg is indicated here. A meter of rolled metal equals 12 millimeters to 0.888 kilograms. Also, as an example, you can take 10 mm rods, the weight of which is 0.617 kg. The last column shows how many meters there are in one ton.

Calculator

Self-calculation

Now the reader knows how much one meter weighs. But in order to better understand the work, you need to understand the scheme by which the calculation is carried out. Having understood the essence, the builder will be able to calculate the weight of one linear meter of rods with a diameter of 12 or 10 mm. To perform the calculation, you must proceed according to the following scheme:

The volume of one linear meter can be obtained using the following formula: 1m x (0.785 xD xD). Here the letter "D" denotes the diameter of the circle. total weight multiplied with the specific gravity of the rods, in all cases it will be 7850 kg/m3. To find out how much a meter weighs, you need to know the volume.

For example, you can independently calculate the mass of one meter of 10 mm reinforcement. The first step is to obtain the volume - 1m x (0.785 x 0.010 x 0.010) = 0.00010124 m3. The mass of rods is 10 mm – 00010124 m3 x 7850 = 0.616 kg. If you look at the table, one meter of reinforcement 10 weighs 0.617 kg. How much a meter of rods 14 or 16 weighs can be found using the same scheme.

Number of meters in one ton

Above is the calculation for 10 mm. The number of meters per ton can also be calculated without using specialized tables. Here it is worth referring to building regulations, which say that the strip base must contain at least 0.1% of rods in relation to reinforced concrete structure. This formulation looks quite complicated. To understand how this works, it’s worth looking at an example:

1. A strip base is taken, the area of ​​which is 2400 square cm.
2. Next you will need a coefficient, for this formula it is 0.001.
3. The resulting volume is multiplied with a coefficient - 2400 x 0.001 = 2.4 cm2.
4. On next stages without reference information it won't be possible to get by. Here you will need a manual that indicates required amount rods. For reinforcement with a diameter of 10 and 12 mm, two rods are sufficient.

What you need to know about A12 fittings

Rods are made from steel, the grade of which depends on the requirements for strength, wear and other parameters. Typically, builders choose rods made of low-alloy metal. It cannot be said that this is the most reliable and durable steel, but it does have an important advantage - low-alloy metal can be processed using arc welding.

Grade A12, like reinforcement with a diameter of 10 mm, is usually used to add strength to a structure made of reinforced concrete. Also, these rods are the main element in construction frame structures. In addition to this parameter, you also need to pay attention to rental, it differs by class:

• Periodic profile – A3. Class A3 fittings have transverse corrugation.
• Smooth profile – A1. Unlike A3, class A1 fittings come without corrugation.

You can purchase reinforcement, regardless of diameter or class A3, in coils or rods.