Concrete M350 is an excellent structural material that makes it possible to produce very important structures for various purposes and various prefabricated elements. After hardening, this composition is characterized by high resistance to external influences, has good characteristics, especially compressive strength. In modern construction, it is B25 class concrete that is the leader both in popularity and in sales.
Material application
Concrete M350 class B25 is used in almost all types of construction. Floor slabs, monolithic foundations, walls, crossbars, columns, reinforced concrete structures and other structural elements of residential, industrial and administrative buildings that carry heavy loads are made from it. Also, road airfield slabs are made from this mortar, which are operated under conditions of maximum loads.
Let's consider in detail the characteristics that this building material has.
Features
Consider the strength of the set oncompression. It is measured in MPa, determined by class B25 (1 m3 of material without violating integrity is able to withstand a pressure of 25 MPa). The increased strength of B25 is achieved due to the presence of a larger amount of cement in the mixture. In addition to strength, this brand of cement has other equally important indicators: frost resistance, mobility and water resistance.
Mobility
This indicator varies from P2 to P4. But the level of strength can be increased to large values if the concrete is supplemented with special additives - plasticizers.
Water resistant
Concrete B25 has a water permeability index - W8. This parameter indicates that the material is able not to pass moisture through itself, even if it acts on it under significant pressure. Thanks to this, the M350 concrete grade can be used in areas with high groundwater.
Frost resistance
Frost resistance index F200 indicates that this material will not lose its properties and structural integrity after two hundred cycles of freezing and thawing. Such concrete can be used in harsh climatic conditions.
Volume weight
This indicator in M350 concrete is 1800-2500 kg/m³. However, most often the bulk density (density) of this material varies from 2200 to 2400 kg/m³.
Main Components
M350 concrete is typically produced as a mixture of cement, water, sand and hard aggregate such as crushed gravelor granite. To improve the properties of this material, additives and plasticizers are mixed into its composition, thereby expanding the scope of this brand of concrete
For the manufacture of class B25 mortar use:
- cement;
- sand;
- rubble;
- water;
- plasticizers;
- antifreeze additives.
It should be noted that the components used to prepare the solution may differ in their characteristics and parameters, namely particle size, strength, purity, moisture content.
For example, as a filler can serve:
- sand of fine-grained, coarse or medium fraction;
- gravel (lime or granite);
- rubble and screenings.
It is also worth noting that B25 concrete has an increased percentage of cement content, which contributes to fairly rapid hardening.
Proportions
To prepare 1 m3 of this material you will need:
- 400 kg cement M400 or M500;
- 752 kg of sand, free of impurities;
- 175 liters of water;
- 1 ton of solid aggregate (e.g. crushed stone).
In order to obtain high-quality and durable concrete M350, it is important not only to strictly observe the proportions of the composition per 1 m3, but also thoroughly mix all the components so that the resulting mass is homogeneous. Poorly mixed composition significantly reduces the strength of this material.
Preparing the solution
- First you need toconcrete mixer add dry ingredients (cement and sand) and mix thoroughly.
- Add water. At the same stage, a plasticizer or other additive is poured into the solution.
- Crushed stone or gravel soaked in water is added.
- The solution is thoroughly mixed.
Concrete M350: price
Manufacturers themselves set the price for the material by summing up all the costs, the main part of which falls on crushed stone and cement. To make a profit, a trade margin is made in excess of the cost price. That is why each manufacturer gets its “own” final cost, which largely depends on the cost of raw materials.
Each developer chooses from whom to purchase M350 concrete. The average cost of this material with gravel filler without delivery will be from 3,000 rubles. for 1 cubic meter of mixture, with crushed granite - from 3,700 rubles.
If antifreeze additives are introduced, the price will start from 4,000 rubles. Also, the cost of concrete is affected by its water resistance - the higher this indicator, the more expensive the price. So, we can conclude that the cost of the material depends on the manufacturer and the cost of acquiring the constituent components.
