Concrete b 25: characteristics and features of the
This material continues to firmly hold leadership in the construction market. Such strong positions are justified by its excellent functional characteristics, which allow it to be used in the construction of any type of objects as a main or auxiliary material.
Characteristics and basics
Immediately it should be noted that concretes are divided into brands and classes, depending on their strength characteristics. The most popular and widely used class is B25.
This material belongs to the category of heavy, and therefore, finds its application in capital construction, laying of foundations, construction of hydraulic structures and the construction of all objects that require serious strength of the whole structure.
The characteristics of concrete B 25 are listed below:
- Density 1800-2500 (kg / cubic meter).
- The value of the permissible pressure on the structure 25 (MPa).
- Frost resistance F 200.
- Water resistant W 800.
- Mobility P2-P4.
Features of use
Based on the above characteristics, it becomes clear that:
- In addition to good strength, it is resistant to the destructive action of the aquatic environment, which allows its use not only in the conditions of ordinary construction.
- Equally important is the fact that it is able to withstand lower ambient temperatures, thus its scope of application instantly increases. This is very important when building in areas of temperate climate and in areas of the far north. Characteristics of concrete B 25 allow, without any problems whatsoever, to apply it in any conditions.
- Concrete of grade B 25 gained additional popularity after the tightening of design requirements for the characteristics used in the construction of residential and non-residential facilities.
And after all the described class considerably surpasses the nearest competitor B 22,5 in strength characteristics.
Note! It is strongly not recommended to prepare the solution with your own hands. This is due to the fact that in the conditions of the construction site it is quite difficult to precisely meet all the proportions of the components used, and the process of determining readiness for pouring seems rather difficult.
Methodology
In order to avoid confusion between brands and classes, it is necessary to clarify this issue.
| How to decipher concrete B 25 | The so-called class. It is encrypted its strength with guaranteed security. That is, described in this particular case, it is guaranteed to withstand a load of 250 (MPa). |
| Brand name | But there are various brands. The brand is encrypted the average value of the compressive strength of concrete. To the question - what brand of concrete B 25 is closest, the answer is brand M 350 |
| Class designation | It should be noted that nowadays a class is indicated more often than a brand. But this is more a recommendation than a manual, so in practice, the vast majority of construction firms order it in stamps. Therefore, before the start of construction work, it is necessary to clearly define both the class and the brand. |
| Strength designation | There is another way to subdivide concrete, associated with its strength characteristics. But even here, no difficulties should arise, since there are special tables in which the brands and classes correspond. For example, class B25, mark M350, and according to another methodology, this class is concrete C20 25. In essence, this example is about and the same composition of the solution, only differently marked. |
The answer to the question - what brand of concrete is C20 25, is the M350 grade already indicated above,
Economic soundness
Referring to the category of heavy, concrete class C 20 25 certainly worth more than light. But this should not be misleading. After all, such a material has much higher characteristics, both in strength and in its ability to withstand the aggressive effects of the environment without deforming the structure.
Regarding the business case, you can also note:
- Also, do not pay special attention to the fact that it is advisable to buy concrete C20 25 at the factory, and not to prepare it yourself. The fact is that such a solution is used for pouring the concrete foundation and building capital walls, that is, in works where the principle of preparing the mixture “by eye” is absolutely unacceptable.
- At the same time, it can be noted that the already prepared mixture is poured with a mixer or pump into the previously prepared forms. That is, the main work here is to prepare the reinforcement base, the frame and formwork, which must withstand the weight and pressure of the solution.
- Plus it is necessary to take into account that during pouring, the so-called concrete is vibrated, when it must completely cover all the space in the formwork. This is necessary in order to eliminate the formation of air in the pocket, which has a negative effect on strength.
Note! At the factory, it is subjected to multiple checks, and is shipped only if according to its characteristics it fully complies with GOST.
Given all the above, we can conclude that the price is quite reasonable, and the construction costs will pay off, since the construction will serve for a very long time and practically does not require repairs.
Concrete C 20 25 continues to be the most popular building material. Thanks to a good combination of price and quality, it is used year after year for laying the most diverse foundations and building monolithic structures.
Where durability, reliability and durability are required of the object being built, it is used. Moreover, this type of mixture is excellent for pouring quite interesting structures, for example, for the construction of a ceiling or interfloor overlap.
Conclusion
When building your own house, as well as when working with multi-storey buildings, the characteristics of concrete mortars play a decisive role. And the video in this article will demonstrate all the basics of working with concrete, its brands and classes.