The strength of any structure depends on the foundation, the quality of which is determined by the concrete brand and proportions. In the manufacture of the foundation, it is necessary to use exclusively durable concrete, and concrete mixtures with a much smaller brand are suitable for filling the floor screeds.
Classification and use of concrete
Surely on packages you saw an inscription on the likeness of “M -200”, where M is the designation of a concrete brand, and 200 is the strength (the ability to withstand the external exposure, whose strength is 200 kg per square cm). Sometimes a concrete brand can be indicated by the letter “B” – in this case, strength indicators are indicated differently. For example, “B10”. This means that this concrete class is able to withstand pressure no more than 10 MPa.
Concrete M 150
Used to fill the floor tissue, due to the solid composition. Simple yard buildings can be built from it, concrete paths, and can also be used as a preparatory layer.
Concrete m 200, m 250
The most common concrete variety. Used for private construction work. Can be used in the manufacture of any foundation, walls, tiles. This type of concrete shows good characteristics in terms of strength, so it can be used for individual construction.
Concrete M 300, m 350
It is necessary to create structures with large loads. It can be concrete columns. It is used to fill the bowls of pools, pile-roster foundation.
Concrees from M 400 can rarely be found in private construction, since there is no need to use more durable varieties of concrete. This is not rational. Each type of concrete has its own proportions of the elements included in it. Cement is taken as a basis – usually it is M400 or M500. Crushed stone, sand and water are also added.
To obtain concrete M 150, you need to mix a bucket of cement, 3 \ 4 buckets of water, 5 buckets of crushed stone and 3.5 buckets of sand. As for the density of concrete, it cannot be determined, since there is a fairly large number of all kinds of factors that affect this indicator. It depends not only on the incoming components in the composition of concrete – for example, the granularity of the sand, the presence of impurities and the quality of cement can affect. There is a classification of concrete in density: heavy (density up to 2500 kgm3). There are also heat -insulating concrete, but their density does not exceed 500 kg \ m3. They usually insulate the floors and walls.