Characteristics and composition of concrete grade M-550 (B40)

B40 concrete characteristics

Characteristics of concrete M550

M550 concrete cannot be called the most popular, and this is not because it has many disadvantages; rather, its advantages are to blame for this. After all, it has increased strength characteristics, which are simply not used often in construction. But if you still decide to use this brand of concrete, your structure will be reliable and will last for many centuries.

Now most factories do not produce this brand. But still, there are those who are engaged in the production of such material as concrete m 550. These include serious organizations included in the inspection register. It is impossible to do it with your own hands.

Where is it used?

Often used in the construction of durable hydraulic structures, bridges, foundations for skyscrapers, subways, beams, crossbars, columns, dams, bank vaults, as well as special-purpose structures. Another area of ​​use is military facilities. In official documents, the name of this concrete is indicated as m550, but popularly it is called the index m500.

The use of this construction product is indicated by demanding regulations, which relate to the operational conditions of reinforced concrete structures that are made from this concrete. Also, it cannot be used in the construction of private houses. After all, the reliability of the brand per cubic meter is very high and is not intended for the construction of low-rise buildings.

Proportions and composition

When people talk about this concrete, they mean strength class B40. When preparing a concrete mixture, the following proportions are implied: for one part of cement, take one-half part of sand and two-sixths of granite crushed stone, fill everything with half part of water. This is the basis of the building material.

With these calculations, to obtain one m3 of concrete you need to take four hundred and eighty kg of cement, five hundred and seventy-six kg of sand, one thousand two hundred and fifty crushed granite, as well as two hundred and forty liters of water. It is important to remember that it will have high adhesion and will dry out. Therefore, additives are used to make the mixture suitable for use longer.

Characteristics

This concrete has characteristics such as: frost resistance, which shows how many cycles of freezing and defrosting it can withstand without losing its properties, indicated by the letter F. Water resistance, which proves the ability to withstand the action of water so that there are no leaks. Expressed using the letter W.

As well as the mobility of the mixture, or ease of placement. It is better to work with a more liquid texture than a solid one. This is achieved using plasticizing additives. For concrete type M550, the mobility is about P3, P4 and P5.

average price

In each region of the country, prices, of course, differ. The approximate cost of M550 building material is much higher than the prices of more popular brands such as M200 and M300, and they are much lighter. Therefore, it is considered quite expensive for building anything, because it has a huge cement content.

Conclusion

In individual construction work, the use of M550 concrete is inappropriate, because, firstly, there is no economic benefit and, secondly, it is too durable. But residential buildings do not need this at all. Another disadvantage is the fast setting time. We must not forget that preparing it yourself is impossible.

Therefore, if you want to build your own house, it is better to limit yourself to the M200, M300 brand. And for raising a larger structure it is just right.

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Concrete B40 (M500)

Home › Concrete B40 (M500)

Concrete M500 is a fairly rarely used grade of concrete in construction. It is not used at all in private construction or in the construction of residential apartment buildings. When buying this concrete, do not forget that in reference books the name of this brand is written as M550 concrete.

Production of concrete M500 (M550).

To obtain such high-strength concrete M500, it is necessary to use only high-quality components. By and large, the reliability of the final product depends on them. For preparation, the main components are used - cement, sand, crushed stone; plasticizers can be added to increase the setting time of concrete.

To obtain a given grade of concrete, it is necessary to mix the components in the following quantities: cement M500 1 part; 1.1 parts sand and 2.4 parts crushed granite. And also to increase the setting time it is necessary to add a suitable additive. Otherwise, the concrete will begin to set in the mixer even before pouring, then the finished composition will not reach the required strength after complete hardening. The property of concrete to set quickly should not be forgotten in any case.

Characteristics of concrete M500 (M550).

You can buy high-quality ready-mixed concrete M500 at. It has the following characteristics:

— Strength is 524 kg/cm2 – class B40; — Frost resistance F300; — Mobility P4; — Waterproof W12.

These are practically the maximum parameters that are used in construction. In some cases, for example, when testing high loads and vibrations, higher grades of concrete are used. For example, M600 grade concrete is used for subway construction.

Purpose of concrete M500.

Concrete M500 is used exclusively in the professional field of activity. In private construction there is simply no need for such strengths and loads. Used in places where high reliability and strength of the finished structure is required. For example, supports of large bridges and highways. Also used in the construction of huge hydraulic structures - dams, dams, hydroelectric

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Preparation of the working mixture

The specially selected structure of the material allows us to guarantee its excellent quality, strength and durability of the manufactured reinforced concrete structures. The entire formulation of the material, as well as its constituent components, are strictly regulated, which makes it possible to confirm the factory characteristics and their preservation during the subsequent operation of the constructed buildings and structures.

High-quality selected granite crushed stone is used as a filler, which determines the high density of M500 concrete. All stones in the aggregate must have the same fraction, which allows for even distribution of loads, preventing cracking and damage to concrete structures.

In addition to granite crushed stone, finely screened sand of the first category is used as a filler, which must undergo multi-level cleaning to remove additional impurities. This allows the number of pores to be minimized, ensuring the highest possible density and strength of the material. The use of any other fillers is strictly prohibited.

READ Technology for manufacturing reinforced concrete curb stones

To produce such a heavy-duty material, cement of the PC 500 grade is used. This Portland cement is characterized by its high cost, which invariably affects the overall costs of producing M500 concrete. It is prohibited to save on the binder when producing such working mixtures, since the subsequently erected structures do not have the necessary moisture and frost resistance, and their strength does not meet the requirements of GOST and SNiP. The characteristics of M500 concrete will directly depend on the preparation recipe and the quality of the components used.

If ordinary water is used in the production of concrete with standard strength indicators, then to produce M500 it is filtered several times, which eliminates the entry into the solution of numerous additional inclusions that interfere with proper setting. According to the approved production technology for this material, all dry components are initially mixed, only after that plasticizers, various additives and filtered water are added.

READ Types and installation of electrical reinforced concrete supports

Composition of concrete M500:

• Water - 5 l.
• Gravel - 22 kg.
• Sand - 11 kg.
• Cement - 10 kg.

In proportion, cement, sand and gravel are combined in mass fractions of 1 to 1.1 and 2.2. Despite the apparent simplicity of manufacturing this material, it is difficult to make it at home, since various plasticizers are additionally required, and increased requirements are placed on the components used.

Only in a factory environment, with full compliance with production technology, can the proportions of M500 concrete be maintained and a high-quality, heavy-duty material be made, which will subsequently fully retain its strength, and the structures built from it will meet the requirements of SNiP.

technical characteristics, proportions, composition and prices per m3

The brand and class are the main criteria that determine the strength characteristics of the concrete mortar. The remaining regulated values ​​that appear in the design documentation of the objects being built include mobility, frost resistance and water resistance. When the construction process requires the creation of the most reliable structure, M550 is used.

Properties and characteristics of heavy concrete

For the production of M550 (M-500), the proportions of the solution components are used, which are fixed by SNiP 2.03.01-84 and GOST 7473-2010. The exact ratio of components during the technological process guarantees the output of a high-quality product that meets the declared parameters.

To form the mixture use:

• Portland cement M-500 based on clinker of standardized composition;
• sand that has undergone repeated cleaning with a particle size modulus of 2.4-2.6 mm;
• granite-gravel or granite crushed stone with a fraction from 5 to 20 mm;
• The addition of a plasticizer and a precisely specified volume of water is mandatory.

The M550/B40 concrete obtained as a result of mixing must be of high quality and homogeneous composition, since these factors affect its strength and ease of installation.

Application of M550

The use of mortar with increased strength characteristics and wear resistance is in demand when constructing special-purpose structures that will withstand loads for a long time. M500 is chosen when creating massive supports for complex objects, as well as:

• bridges, dams and other reinforced concrete hydraulic structures;
• formation of underground transport facilities;
• foundations of high-rise buildings;
• nuclear power plant facilities;
• airfield coverings, load-bearing pavements;
• bunker type premises.

Read about the use of M550 concrete for pouring parking hemispheres here.

Strength sufficient for long-term static and dynamic loads is ensured by the content of high-grade cement M500.

The difficulty in selecting the proportions of components for the composition and the kneading process itself, as well as the speed of setting, do not allow the mixture to be produced in an artisanal way. Factory-prepared heavy concrete of class B40 (M550), due to the nature of hardening, is delivered over long distances in an accelerated mode, which entails additional costs. Therefore, the use of M-500 in individual construction is unprofitable.

Cost of B40 solution

Most often, the composition of B40/M550 (M500) concrete, which is offered to be purchased at factories, does not include antifreeze additives. Their proportion must be negotiated individually.

The price in the price list does not include delivery. The price of the solution varies depending on the location of the regions.

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Technical characteristics of concrete M500 GOST 7473-2010

The main characteristics and cost of concrete of this brand depend on the type of coarse filler (crushed granite, gravel) and the amount of additives in accordance with the ordered indicators of mobility, frost resistance and water resistance. In general, the characteristics of concrete M500 correspond to the table:

It should be noted that the average cost of 1 m3 of material is indicated in the format “at the time of publication of the article” and may subsequently change up or down in accordance with market conditions and rising prices for materials.

Concrete M550 B40: proportions, composition, characteristics

M550 concrete cannot be called the most popular, and this is not because it has many disadvantages; rather, its advantages are to blame for this. After all, it has increased strength characteristics, which are simply not used often in construction. But if you still decide to use this brand of concrete, your structure will be reliable and will last for many centuries.

Now most factories do not produce this brand. But still, there are those who are engaged in the production of such material as concrete m 550. These include serious organizations included in the inspection register. It is impossible to do it with your own hands.

Where is it used?

Often used in the construction of durable hydraulic structures, bridges, foundations for skyscrapers, subways, beams, crossbars, columns, dams, bank vaults, as well as special-purpose structures. Another area of ​​use is military facilities. In official documents, the name of this concrete is indicated as m550, but popularly it is called the index m500.

The use of this construction product is indicated by demanding regulations, which relate to the operational conditions of reinforced concrete structures that are made from this concrete. Also, it cannot be used in the construction of private houses. After all, the reliability of the brand per cubic meter is very high and is not intended for the construction of low-rise buildings.

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Proportions and composition

When people talk about this concrete, they mean strength class B40. When preparing a concrete mixture, the following proportions are implied: for one part of cement, take one-half part of sand and two-sixths of granite crushed stone, fill everything with half part of water. This is the basis of the building material.

With these calculations, to obtain one m3 of concrete you need to take four hundred and eighty kg of cement, five hundred and seventy-six kg of sand, one thousand two hundred and fifty crushed granite, as well as two hundred and forty liters of water. It is important to remember that it will have high adhesion and will dry out. Therefore, additives are used to make the mixture suitable for use longer.

Return to contents

Characteristics

This concrete has characteristics such as: frost resistance, which shows how many cycles of freezing and defrosting it can withstand without losing its properties, indicated by the letter F. Water resistance, which proves the ability to withstand the action of water so that there are no leaks. Expressed using the letter W.

As well as the mobility of the mixture, or ease of placement. It is better to work with a more liquid texture than a solid one. This is achieved using plasticizing additives. For concrete type M550, the mobility is about P3, P4 and P5.

Return to contents

average price

In each region of the country, prices, of course, differ. The approximate cost of M550 building material is much higher than the prices of more popular brands such as M200 and M300, and they are much lighter. Therefore, it is considered quite expensive for building anything, because it has a huge cement content.

Return to contents

Conclusion

In individual construction work, the use of M550 concrete is inappropriate, because, firstly, there is no economic benefit and, secondly, it is too durable. But residential buildings do not need this at all. Another disadvantage is the fast setting time. We must not forget that preparing it yourself is impossible.

Therefore, if you want to build your own house, it is better to limit yourself to the M200, M300 brand. And for raising a larger structure it is just right.

kladembeton.ru

Concrete M500 (B40): characteristics, price

Concrete M500 is a brand of high-strength concrete with a narrow scope of application. It is the strongest of the standard types of concrete. Most often, the use of B40 concrete is due to specialized requirements for structural strength.

Class B40 concrete necessarily contains granite-type crushed stone and special additives designed to increase the strength of concrete, including plasticizers.

The strength of this material is associated with its high cost; M500 concrete is practically not used in private construction. The material is difficult to transport because it hardens quickly. This can lead to the following types of difficulties - the concrete may harden before it is given the required shape.

This determines the main area of ​​application of M500 concrete – industrial construction.

Order concrete M500 with delivery from us by calling +7 (812) 703-90-66 or leave a request by clicking. We deliver concrete anywhere in St. Petersburg and the Leningrad region

Concrete M500 (B40): price list

The cost of concrete is indicated in rubles (RUB) per 1 cubic meter (RUB/m3) and does not include delivery costs

Price for concrete M500 (B40) from June 5, 2020:

*Price is valid for orders over 500 m3. For smaller volumes, check the cost with our managers.

Concrete M500: characteristics

• Corresponds to class B40;
• Mobility: P1-5;
• Frost resistance: F100-300;
• Water resistance: W2-W12.

The main advantages of M500 concrete are high strength and resistance to environmental influences even in extreme conditions; durability and reliability of structures made from it; high water resistance.

The frost resistance indicator allows the material to withstand up to 300 freezing and thawing cycles. This is extremely important when performing work even in extreme climatic conditions.

Concrete class B40 has an increased water resistance. This makes it possible to carry out work in close proximity to water. The low porosity of the finished material does not allow moisture particles to penetrate inside, therefore the iron elements of reinforced concrete structures are reliably protected.

Concrete M500: application

Since class B40 concrete is classified as a particularly heavy concrete, it is used in the construction of facilities for which the quality and strength requirements are increased.

Due to its high water resistance, M500 concrete is widely used in the construction of hydraulic structures. Dams, dams, swimming pools, water parks require the material not only to have increased strength, but also to have high resistance to the elements of water.

The use of B40 concrete is effective for the construction of reinforced concrete structures, especially those bearing high loads - beams, columns, beams, floors, supporting structures for bridges, subway tunnels. The material is also used for the construction of airfield runways.

The increased strength of the material allows the construction of buildings in zones of seismic activity.

M500 concrete also provides room insulation, which is why it is used for the construction of bank vaults.

B40 concrete is used in military construction for the construction of objects that are resistant to any impact: bunkers, including those with protection against nuclear weapons.

Other brands (classes) produced by LenBeton factories:

M100 (H7.5)M150 (H10)M200 (H15)M250 (H20)M300 (H22.5)M350 (H25)M400 (H30)M450 (H35)

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Advantages and disadvantages

Like other types of concrete, the M550 brand has certain advantages and disadvantages, which are determined by the properties of the material. It is necessary to take into account all the advantages of the mixture in order to ensure the strength and durability of the structures being built. The characteristics of M550 concrete will vary depending on the additives, plasticizers, fillers and production technology used. The main advantages of the material include:

• excellent strength;
• reliability and durability;
• resistance to dynamic and static loads;
• frost and moisture resistance;
• possibility of long-term transportation.

Many builders consider the main disadvantage of concrete to be its high cost.

The substantial price is due to the high content of expensive Portland cement in the mixture, the complexity of the manufacturing technology and the need to use additional plasticizers if it is necessary to transport the material over long distances. Precisely because of its high cost, concrete 550 is not used very widely, since its increased strength and excellent characteristics are simply not in demand in ordinary residential construction.

READ Technology for manufacturing reinforced concrete curb stones

Class B40 grade M500

Concrete grade M500 is a particularly durable material. For its production, only materials such as crushed granite stone (as a filler), as well as special plasticizers are used. They are what give B40 its special water-repellent properties and strength characteristics.

Concrete M500, class B40, which Concrete Plant No. 1 offers to buy, is resistant to low temperatures and is also waterproof. These qualities determine the scope of the material. The M500 is being sold for construction projects that are resistant to water penetration, construction of projects in the northern frosty regions of the country. Also, class B40 concrete is in demand in the production of reinforced concrete structures of extremely high strength.

We use M500 concrete, the price of which is favorable, also for the construction of durable and reliable objects, namely: bank vaults, columns, dams and dams, complex flood structures and bridges.

For the production of B40 concrete, only crushed granite stone with the first category of radioactivity is used. Additionally, fine quartz flour is added to the M500 concrete composition. This increases the cost of B40, but also determines the increased water resistance and strength of the material.

Also, in the production of M500, high-quality cement, purified and sifted sand, as well as gravel of the highest quality are used. The presence of special additives in high quality cement, which is part of B40, makes this concrete resistant to low temperatures and moisture. The presence of plasticizers determines the fast setting time and facilitates installation.

Purchasing concrete grade M500 from our company means getting high-quality material with optimal performance characteristics.

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Concrete grade M500

Concrete grades are designed to provide classification of a given building material. In accordance with their parameters, they are used to solve certain problems. This factor helps ensure the versatility of concrete and the ability to be used everywhere. The M-500 brand is the most reliable and high-quality among those currently sold. It has exceptional characteristics, but this advantage comes at a significant cost.

In private construction, concrete grade M 500 is not used, which is facilitated by the irrationality of such a solution. First of all, the characteristics of the composition after hardening are so great that they many times exceed the design requirements for low-rise buildings. If you purchase M-500 grade concrete for this type of construction work, the solution will become unprofitable. Another factor is the high speed of setting of the composition and the inability to create a high-quality analogue on site without the use of special equipment.

Concrete grade M 500 is used in the following areas of construction:

1. Creation of foundations for particularly massive and complex objects. If the maximum indicator of quality and reliability is required, then the M500 will fully meet all the required parameters. This composition has characteristics that allow it to withstand significant weight and effectively distribute the load after it hardens. The M600 concrete grade is used extremely rarely for foundations, and one of the reasons is precisely the high cost and excessive safety factor.
2. Create supports for bridges, highways, or other objects of this type. The M500 concrete grade, after hardening, is able to withstand significant loads coupled with the influence of the external environment. To enhance reliability indicators, it is customary to use a reinforcing frame made of steel or other metals. This adds an additional premium to the cost of the structure.
3. Construction of hydraulic structures. Due to its high resistance to environmental influences, the M500 concrete grade is ready to withstand operation in any conditions. The composition has proven itself well when used in conditions of variable water levels. This is especially destructive for all concrete structures, but the M500 brand practically does not absorb moisture. It has a significant frost resistance as well as moisture resistance.
4. Construction of special purpose facilities. This includes bunkers of various types, underground and many other options where high performance plays a decisive role. Concrete grade M 500 sometimes implies the need to introduce additional elements into its composition. For example, lead shavings are used for improved radiation protection. This requires a special approach to mixing, but allows you to achieve some other advantages. In any case, this factor is determined separately to ensure the optimal grade of M 500.

The M500 concrete grade is resistant not only to atmospheric factors, but also to the effects of aggressive environments. It can be used in places where, under the influence of external factors, destruction of other building materials of this type occurs.

In order to obtain M500 grade concrete that meets your requirements, it is necessary to comply with a large number of requirements when preparing the composition. First of all, special attention is paid to the core material. Only the highest quality granite crushed stone can be used. Sand for concrete M500 is thoroughly cleaned of all impurities. The optimal type for use is considered to be the fine-grained version, which ensures that all pores are filled. The concrete grade M500 cannot be produced independently and meet the parameters. As practice shows, adherence to technology involves not only following proportions, but also a number of other factors. For example, mixing should be done in stages. If this is not ensured, then the technological stages will be disrupted and the quality of the result may not meet the specified parameter values. It is for this reason that the M600 grade of concrete should be purchased only from factories. Additionally, you need to make sure that you have documents for the composition. The mobility of concrete grade M500 varies from P3 to P5. High cement content promotes accelerated hardening. The composition of the mixture includes a relatively large amount of plasticizer. If you do not introduce it, it will be very difficult to achieve a liquid consistency. The M500 grade of concrete should be easy to lay due to its accelerated hardening time caused by the highest cement content. In general, the high cost is due to cement, which must be taken into account.

The M-500 concrete grade uses crushed stone of the highest level as a filler. The quality of a rock is determined by its compressive strength. This indicator should reach 1200 units and not fall below the established value. It should be said that the use of crushed stone is allowed only with fractions approximately equal in diameter. In no case should the M 600 concrete grade be allowed to contain aggregate with defects in its structure. This approach will reduce the overall effectiveness of the material by reducing its strength properties. Despite the fact that concrete grade M 500 has extremely high parameters that provide extensive operational capabilities, the composition must use various additives. They allow for additional enhancement of certain parameters, which helps to provide even greater expansion of operational capabilities.

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Concrete M550: composition, technical characteristics

Concrete M550 is one of the most durable and expensive types of mixtures, which are usually not used in residential and industrial construction, but are relevant in the construction of special-purpose structures. The properties of concrete are several times higher than the required parameters for the construction of conventional buildings, so it is simply unprofitable to overpay for such an expensive mixture.

Concrete 550 is widely used in the creation of special objects that require increased requirements for water resistance, strength, durability, resistance to loads and pressure.

The quality and strength of concrete are strictly controlled by the standards specified in GOST 10181 and GOST 26633-91. A mixture is produced based on granite crushed stone, river or ravine sand, cement, water and various plasticizers (increasing the ease of working with concrete).

Concrete B40: characteristics

This brand of concrete is distinguished by very high performance and properties that are relevant for the implementation of various projects. When choosing a concrete mixture, you must study all the parameters in order to be able to decide on the brand and the optimal price/quality ratio.

Main indicators of concrete M550:

• Strength - B40 concrete can withstand loads of at least 523.87 kgf/cm2: the mixture can be used for the construction of special objects and buildings subject to severe load-bearing loads.
• The composition is based on the solution: granite crushed stone of expensive fractions, cement grades M500-M600, plasticizers and other additives.
• Water resistance - corresponds to class W10-W14: can be used in conditions of high humidity. It is a hydraulic type concrete that resists direct exposure to water without seepage.
• Frost resistance - B40 concrete demonstrates an F300 indicator: the maximum number of freezing cycles of the monolith is 200-300, the solution tolerates sudden temperature changes well, and maintains stable characteristics even with a large minus.
• Mobility is at the P3-P5 level: plasticizers help make concrete comfortable to work with.
• Hardness – within Z2-Z4

Use in construction

Concrete mortar is produced only at the factory, using a special technology, from high-quality components, so its cost is quite high, and its properties and parameters are not relevant in ordinary residential and industrial construction. There is no point in overpaying.

Therefore, class B40 is used only for the construction of individual objects where it is necessary to provide improved characteristics.

Where concrete M550 is used:

• Complex hydraulic structures - swimming pools, various types of water parks, dams and dams.
• Reinforced concrete structures that experience increased load-bearing loads during operation.
• Monolithic foundations for objects located in an area of ​​increased seismic hazard.
• Design of bank vaults.
• Construction of modern subways.
• Construction of various types of military facilities - bomb shelters, bunkers.
• Creation of runways and highways with increased loads.
• The most critical elements of hydraulic structures can be underwater elements of foundations and bases, dams, berth walls, bridge supports, etc.
• Concrete B 40 is often used for casting columns used in the construction of serious architectural buildings.
• Creation of areas near powerful structures in the format of continuous monolithic sites.

Manufacturing Features

Concrete B40 (strength class) is produced from the following components: cement, sand, granite crushed stone, water. The base of the batch is prepared from these materials, then various plasticizers and modifiers are added to the mixture, designed to make it more comfortable to work with.

Concrete B40 (grade M550) involves the use in production of exclusively high-quality components, which directly affect the level of strength and reliability of the monolith.

To prepare concrete, take part of M500 cement, 2.4 parts of granite crushed stone, 1.1 parts of sand, water and a plasticizer. Additives make the mixture more workable and prolong the hardening period (otherwise the solution will begin to harden right during mixing and will not gain optimal strength).

What is needed to mix 1m3 of B40 concrete:

• Cement M550 - about 475 kilograms
• River/ravine sand – minimum 810 kilograms
• Granite or crushed stone - about 1075 kilograms
• Water – 170 liters
• Plasticizer – 9 kilograms

Concrete 40 is produced exclusively in a factory using special equipment, which makes it possible to control compliance with the mixture preparation technology: temperature, correct sequence of adding components, water hardness indicator, homogeneity of the final mass. You can order concrete for your project directly from the plant - both Moscow and the regions offer a large selection of manufacturers.

Concrete composition

The M550 brand offers such features as the maximum level of strength, density and thickening speed. The composition of concrete is standard, they simply take different proportions (compared to other brands) and add a plasticizer to make the work easier. All components must meet quality standards - high-quality cement, filler.

What is included in concrete M550:

1. The binder is Portland cement grade M500 (produced on the basis of clinker of a standardized composition).
2. Fine filler - sand after repeated cleaning, fraction 2.4-2.6 millimeters.
3. Large filler - granite or gravel-granite crushed stone of a fraction of 5-20 millimeters.
4. Hard water.
5. Plasticizer – suitable for operating conditions and allowing to achieve the desired characteristics.

Cement M550 with alumina in its composition is used in the construction of fire-resistant concrete and reinforced concrete structures. All work with this binder is carried out exclusively at sub-zero temperatures - it is better even in frosts of -20 and below.

The use of M550 concrete in individual and industrial construction is not relevant due to the very high cost and indicators that will not be fully used. But when constructing special objects, the solution makes it possible to achieve maximum reliability, strength, and durability.

It is not advisable to prepare a concrete solution yourself; it is better to order a high-quality mixture from the factory, which is guaranteed to meet the standards of the M550 brand.

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Technical characteristics of cement m500

When choosing cement for preparing concrete, first of all, pay attention to the technical parameters of the semi-finished product. For cement m 500 they are:

*depending on the degree of compaction of the mixture and the mineralogical composition of the raw materials. If the exact indicator is unknown, the specific gravity of dry binder is taken for calculations as 1300 kg/m3 (average).

A cube of cement m500 weighs on average 3 tons. It depends on the bulk density of the binder, the fineness of grinding, which is on average 92%, and also on the presence of additional components. For example, gypsum lightens the volume, but slag, on the contrary, increases it.

Concrete grades | Concrete B7.5 (M100) | Concrete B12.5 (M150)

Home » Application of concrete in accordance with grades
We invite you to familiarize yourself with the classes (grades) of concrete and their scope of application:

• Concrete B7.5 (M100) is a lightweight type of concrete. It is used in preparatory work when pouring foundations and monolithic slabs, for concrete preparation when working with reinforcement, in road construction when arranging curbs.
• Concrete B12.5 (M150) is one of the varieties of light (lean) concrete. The scope of application of this class of concrete when pouring foundations and monolithic slabs is limited to preparatory work. It is also used to form screeds when pouring floors, arranging garden and pedestrian paths, and installing curbs. Can be used to build foundations for small structures.
• Concrete B15 (M200) - covers a wide area of ​​construction work, thanks to its high compressive strength. It is used in the construction of various types of foundations, retaining walls, and arrangement of sites and paths. Can be used in the manufacture of stairs, in road construction, for concrete pads under curbs.
• Concrete B20 (M250) is similar in scope and characteristics to B15, but it is stronger and can be used in the manufacture of floor slabs with light loads.
• Concrete B22.5 (M300) is a popular brand used in the construction of walls, in the construction of strip, pile-grillage, strip and other monolithic foundations, in the manufacture of fences, stairs, for pouring blind areas, platforms, etc.
• Concrete B25 (M350) - used for slab foundations in the construction of high-rise buildings. It is characterized by high strength and can be used in the production of hollow-core floor slabs and beams. It is widely used in monolithic housing construction, in the manufacture of bowls for swimming pools, airfield road slabs, load-bearing columns and much more. B25 concrete is able to withstand increased loads, which is why it is widely used in the construction of public and commercial buildings.
• Concrete B30 (M400) is an average grade of concrete, characterized by fast setting and high cost, therefore, compared to grades B15 and B22.5, it is not so popular. Due to its high strength and reliability, it is an indispensable material for the construction of bank vaults, hydraulic connections and reinforced concrete products, which have special requirements. Recommended for use in facilities with high safety requirements: water parks, indoor swimming pools, shopping and entertainment complexes, etc.
• Concrete B35 (M450) is used in civil engineering, but due to its rapid setting and high price, its use is limited. It is used similarly to B30 concrete: in the construction of dams, dams, bank vaults, subways, etc.
• Concrete B40 (M500) and B45 (M550) has a large percentage of cement in its composition, is characterized by high strength, and is used in special-purpose reinforced concrete structures and hydraulic engineering construction. As a rule, it is not used for the construction of buildings.

The class or grade of concrete (“B” or “M”) is an important indicator of its quality. The secondary characteristics are: water resistance (W), frost resistance (F), mobility (P). Concrete is selected according to its strength, that is, by brand (class). The numbers indicate the compressive strength.

Compliance with the parameters is checked using a special press by compressing cubes or cylinders cast from mixture samples, which are kept for 28 days until completely hardened. The parameters are determined by the class of concrete and regulated by GOST. The parameters and brands differ in a small nuance: in classes the strength with guaranteed security is indicated, in brands - the average value of strength. According to the CMEA standard 1406, the requirements for concrete are specified in classes.

The table shows the strength relationships between grades and classes of concrete with a coefficient of variation V = 13.5%

Strength ratio between grades and classes of concrete

When hardened, the strength of concrete becomes higher. If proper care is provided and good weather conditions, after 7 days, concrete acquires 70% strength, and it gains strength corresponding to the class on 28 days. The properties of concrete and its strength deteriorate significantly when it quickly dries or freezes.

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