Concrete B20: technical characteristics, features and applications

General description of the substance brand

The use of concrete of this brand is the most optimal option in terms of price/quality ratio if the process of concreting a monolithic frame structure, arrangement of paths, platforms, or construction of buildings is underway, regardless of how many floors are planned to be built. Purchasing this mixture is also easy. The price for 1 m3 will vary depending on the quantity, quality and what kind of admixtures were used as additional components. B20 concrete is quite easy to mix even at home. The only thing that is important to consider is the change in proportions, since this raw material is quite sensitive to them.

Buy M300 concrete in Moscow with delivery from

Experts value M300 concrete for the reliability and versatility of the final product. It is suitable for the manufacture of products such as a washing machine and others, as well as for the construction of various objects. Today it is one of the most popular types of building material.

Composition of the substance

The composition of the brand of raw materials is the simplest - cement, sand, crushed stone, water. However, it is important to note here that the type of coarse aggregate may change, due to which the density of the final composition can vary between 1800-2300 kg/m3. Concrete will have the lowest density if expanded clay is used as a filler. The composition, which includes B20 slag concrete, has a medium density. The composition with granite crushed stone as a filler is characterized by the highest density.

Concrete B20 is a standard grade of concrete that belongs to the mobility class P2-P4. The standard strength for this brand is 28 days. It is also worth adding here that some manufacturers of this product replace a certain part of the solid filler with mineral additives. This makes the final composition more plastic, but it also increases the cost of the finished product.

Peculiarities

It is worth saying that b20 concrete is an intermediate composition. It is slightly better than the M200 grade, which is considered a cheap raw material and is not used for the construction of long-term facilities. But at the same time, M250 (M50) is somewhat worse in its characteristics, and therefore cannot be used as a foundation for objects characterized by heavy load, like M300. Among the advantages of the M250 brand, one can highlight the fact that it successfully combines the optimal ratio of substances. If the proportion of solid filler is large enough, then the maximum tensile pressure that it can withstand after hardening is 20 MPa. However, it costs less and is also more flexible and lightweight than premium brands.

Technical parameters of the material

Concrete grade B20 is characterized by the following technical characteristics. The strength level of raw material M250 is 260 kg/cm2. The frost resistance of concrete is within F150-200. It is worth adding here that this parameter can be increased artificially by adding more crushed stone from hard rocks to the composition, as well as introducing some strengthening additives. If we talk about the water permeability of the material, it ranges from W2 to W8. For example, there may be concrete B20 W6. This parameter can also be changed artificially if the necessary additives are introduced. As mentioned earlier, the density, as well as the weight of the substance, will directly depend on the selected solid aggregate. The mobility of the substance is P2-P4.

Frost resistance of concrete

For concreting at sub-zero temperatures, special frost-resistant concretes are used. This ability of a hardened concrete mixture to withstand multiple cycles of freezing and thawing while maintaining its technical characteristics unchanged for a long time. This parameter is tested until the reduction in concrete strength reaches five percent. After this, the number of completed cycles decreases downwards to around ten.

When classified, it is designated by the Latin letter “F” and is accompanied by a digital value of 50 - 1000. In the presence of special additives, the maximum value of “F” can be more than 300, but such concrete mixtures are rarely used in mass construction in temperate climates due to their high cost.

Concrete grades by frost resistance

When determining frost resistance requirements for concrete, climatic conditions, the depth of soil freezing and the possible rate of change in outside air temperature should be taken into account. The standard classification is defined in GOST 10060-2012 and divides all produced mixtures into 5 classes of frost resistance:

• F50 with low frost resistance is used only in warm interior spaces;
• up to F150 with normal stability for the construction of buildings in areas with warm and temperate climates. The operation of the building can reach 100 years;
• F150-300 with increased frost resistance for areas with harsh winters and freezing soil, for example Siberia, is used for any buildings, including swimming pools;
• F300-500 high resistance for northern regions with deep soil freezing;
• F500-1000 with extremely high stability for particularly critical structures.

Characteristics of various concrete mixtures according to GOST

The definitions of the standard show that the most common grades in Russia include concrete with indicators F150 - F250. The GOST classification does not apply to concrete used for road construction and airfield runways.

Where is the composition used?

The characteristics of B20 concrete have led to its main purpose being the pouring of monolithic foundations of any type. It is also successfully used for arranging blind areas, flights of stairs, lightly loaded walls and ceilings. The parameters of the material do not allow it to be used as a foundation, on which a high load is expected in the future. However, if you provide good reinforcement, you can build columns, foundation rings, and wells. The possibility of erecting the latter structure is possible due to the fact that b20 w4 concrete is characterized by good resistance to moisture and other aggressive environments, which is the main quality for the material used in the construction of a well. In addition, the use of this concrete is considered optimal if it is necessary to build a high-rise building. With its help, a monolithic foundation is poured. Another application is the production of reinforced concrete products, but for this it is necessary to use granite crushed stone as the main solid aggregate for the composition.

Scope of application of class B20 concrete

Class B20 concrete corresponds to grade M250, which has a strength of 262 kg/cm².

Concrete M250 - application

This brand is used for concreting monolithic frames, platforms, paths, and in the construction of buildings of any number of floors.

This material is used to fill foundations of any type, construct internal walls, stairs, platforms, ceilings in low-rise buildings. This brand is actively used in the construction of garages, bathhouses, and private houses.

Concrete B20, containing granite crushed stone, is used for the manufacture of reinforced concrete structures and components. Reinforced structures can be used in the construction of structures with higher load requirements.

The advantage of this class is the favorable ratio of components, providing high compressive strength, lightness, ductility and low cost.

Amount of cement per cube of concrete

How to mix concrete M250

The solution is prepared either in a factory or at home using gravity concrete mixers. When producing M50 concrete, it is characteristic that the proportion of the binder element decreases, and at the same time the volume of mixing liquid increases. For this reason, in order to achieve the required strength of B20 concrete, it will have to be mixed thoroughly. In this regard, factory-made products always have an advantage over home-made ones. When preparing the mixture, it is best to use the following proportion: 1: 2.5: 4.6 (cement: sand: coarse aggregate). Naturally, cement is the basis for the solution. To prepare a high-quality mixture, it is best to take cement grade I/II 32.5 (the proportion of slag should be small).

An alternative option is Portland cement, which can also be used. The main requirement for any type of cement is freshness. If we talk about sand filler, then it is best to use river material with a particle size module of 2 or 2.5.

All the above proportions correspond to GOST 27006, which regulates the quality of the M250 (M50, b20) mixture. Generally speaking, to prepare 1 m3 of mixture you will need 536 kg of sand, 360 kg of cement, 1141 kg of crushed stone and 133 liters of water.

Delivery of M300 in Moscow

You can buy M300 concrete in Moscow with delivery for the following construction work:

• Pouring foundations for buildings up to 25 floors high.
• Construction of a concrete “cushion” for highways and runways.
• Production of high-strength shaped elements.
• Production of piles and other reinforced concrete products.
• Construction of columns, beams, pillars.
• Construction of hydraulic structures, bridges, metro tunnels.

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Benefits and other indicators

The undoubted advantages of the composition include the following points:

• The use of the composition allows the production of prefabricated and monolithic structures for various buildings.
• The level of material costs for production is quite low, as local ingredients are used.
• It is possible to mechanize or automate the solution manufacturing process.
• It is characterized by high strength and fire resistance. Other important indicators can be increased depending on the requirements by changing the composition.

Another important factor that is often overlooked is convenience when placing concrete. This factor plays a decisive role if a concrete pump is used for laying. However, it is worth noting here that you will only have to use concrete b20, which belongs to class P4 in terms of its mobility.

Some advantages of the m-300 material

When conducting private or commercial construction, it is better to choose M300 concrete; it is worth buying it for a number of reasons:

1. resistant to negative natural factors;
2. durable, fire resistant;
3. ecologically pure
4. economical - the price for M300 concrete is more than reasonable;
5. the basic composition allows you to improve the properties of the final product to the desired level by introducing various additives.

Concrete grade M300 has 9 advantages:

1. Strong enough to be used to pour foundations for skyscrapers
2. Easy to prepare.
3. Resistant to mechanical stress, high humidity, fungus, mold, and efflorescence.
4. Easily resists chemicals and ultraviolet radiation.
5. Will last up to 140 years.
6. It is well represented on the construction market, so you can buy M350 concrete at any building materials store.
7. Wide scope of application.
8. High frost resistance.
9. Low water absorption coefficient.