When starting construction work, the owners of summer cottages have to deal with terms that they have not heard before. For example, many are interested in what BSG concrete is. The decoding of the abbreviation is simple - these are ready-to-use concrete mixes.
That is, concrete that is delivered directly to the construction site in finished form. In this it differs from BSS - dry concrete mixes. They still need to be diluted with water in a certain proportion to get the necessary material.
What represents
When BSG concrete is needed, the decoding of which indicates that it is a ready-made mixture, the customer needs to contact the manufacturer directly. In such cases, the company delivers the mixture using concrete mixer trucks. This is a technique equipped with appropriate equipment that allows you to maintain the solution in a certain state until it arrives at the site.
According to the composition, BSG is a mixture of classic ingredients - cement, sand, crushed stone, water. The proportions depend on what characteristics the final product should have.product. Also in BSG there may be special additives to improve the performance of the material.
Deciphering BSG concrete means that the mixture is already ready, and the customer cannot control the process of its production. However, this does not mean that everything is left to chance. The entire production process is still controlled.
The company uses a recipe that meets the requirements of GOST for such mixtures. Concrete is made from high-quality raw materials, the ingredients are taken in exact proportions, which allows you to get a mixture with the desired characteristics, that is, its viscosity will meet the standards, and after hardening the mixture will turn into a monolith that can withstand all standard loads.
Key Benefits
BSG are used in various fields, both for the construction of residential buildings and for industrial construction. Of course, there are some brands of concrete that have specific characteristics and cannot be produced using such technologies, but in general, BSG is a fairly wide category of materials.
Deciphering BSG concrete turns out to be quite long. It is often referred to as ready-mixed concrete. The main advantage is high quality. At the construction site, it is almost impossible to achieve such characteristics. After all, for this it is necessary to ensure the protection of all ingredients and fillers from contamination, to maintain the set temperature stably, to achieve accurate compliance with the dosage for each ingredient.
All these are very difficult tasks. Not to mention thatyou need to choose high-quality base ingredients from the very beginning and mix them in a certain sequence.
Types of BSG
Several criteria are used to classify ready-mixed concrete. They are divided into groups depending on the aggregate used, the density of the cement, the structure of the material, as well as its strength.
From this point of view, they distinguish:
- lightweight concrete;
- concrete mixes BSG heavy concrete, and they are both ordinary and extra heavy;
- precast concrete for social use.
The choice of a specific variety depends on what tasks are set by the developer.
Grades of ready mix concrete
Do not confuse brands of concrete and its types. Manufacturers, as a rule, indicate the full marking in their catalogs or price lists. That is, they write not just "BSG B15 concrete", the decoding of which gives only one indicator of strength. They can write, for example, "concrete M350 V 25 P4 F200 W8", and here such indicators as its strength, frost resistance, mobility and even water permeability are already presented.
This is not a publicity stunt. There is GOST, concrete mixes BSG of heavy concrete B15, light or even special purpose must be fully marked. At the same time, M is the grade of the material, P is its mobility, F is frost resistance, and W is water resistance. At the same time, B is a class and is not the same as a brand.
The above can be seen with an example. M200 or M350 are just averages of compressive strength (even a special press is used to determine them).
Theoretically, the more cement the mixture contains, the stronger the concrete will be. Therefore, the numbers that are indicated after the letter M say how much cement is contained in concrete. Accordingly, it is believed that grades M50-M100 are concretes with a low cement content. Then come the mixtures with the average. Finally, in grades M500-M600 - the highest content of cement. Their strength is higher, and the price too.
Class
In a simplified form, we can say that the grade of concrete is its rounded average compressive strength, expressed in kgm / sq.cm. And the class is guaranteed strength in megapascals.
For example, an offer comes to the mail: "Concrete BSG V15 P3 NKSCH". This will mean that the guaranteed strength is 15 MPa. If converted into units of average compressive strength, you get 153. That is, approximately corresponds to the M150 or even M200 brand.
Before, concrete was only marked. Now only the class should be reflected in the regulations, but many sellers continue to indicate the brand or write both.
Frost resistance
Frost resistance of concrete is also an important indicator. It reflects the number of cycles of freezing and subsequent thawing that a particular type of material can withstand without losing its performance.and without deforming.
This indicator in the marking is indicated by the Latin letter F. The numbers after it show how many cycles the concrete will last.
For example, F50 is 50 cycles. It is logical to assume what 50 years means, but this is not so, only the cycles themselves are taken into account. Therefore, the higher the score, the better.
For areas with severe winters, it is generally recommended to choose concrete with an indicator of at least F500 and even higher.
Water resistant
The durability of the material is affected not only by its frost resistance, but also by its water resistance. The indicator is of particular importance for concrete, which is used for arranging foundations and pouring foundations in the ground. It is denoted by the Latin letter W and reflects the water pressure that the concrete will be able to withstand.
Those who buy dry mixes are no less interested in this indicator. Moreover, they still have to prepare concrete on site.
Those who buy BSG B20 W20 concrete do not need a recipe: the mixture is brought ready-made, it remains only to use it for 2 hours so that it does not lose its properties.
Where different grades of concrete are used
When choosing a brand of concrete, whether ready-made or dry mix, adhere to the following rules:
- M100 is a material that can be used both for preparing the base for the road surface, and for fixing the curbs, and for laying the substrate when the concrete foundation is poured.
- M150 is also most often used to formpreparatory layer for the construction of monolithic foundations. It can also be an independent foundation, but only for relatively small buildings. It is also used for garden paths in the areas.
- M200 is a more popular option, which is most often used in the construction of full-fledged foundations of various types - not only tape, designed for a relatively small load, but also monolithic or pile. It is used for screeding where there are high loads on the floor. It is also necessary in the construction of ramps and stairs. Very popular in private low-rise construction.
- M250 has a similar scope, but is used much less frequently. But it is indispensable for the construction of monolithic foundations of high strength.
- M300 is a brand that is used in construction for a variety of purposes. It is needed for the production of reinforced concrete slabs, ready-made flights of stairs, it is taken for the construction of concrete fences, etc.
- M350 - already higher strength. Such a mixture is suitable even for floor slabs that can withstand significant loads.
Bridge structures are made of M400 grade concrete. Meets on the market and concrete M500. But this is a very high strength. In housing construction, the material is rarely used - it is mainly used in the construction of dams, the construction of bank vaults, etc.
