How to calculate the concrete on the foundation for

When building your house, especially if you decide to build it yourself, you will definitely have to face the question of how to calculate the amount of concrete on the foundation (we take into account the monolithic strip foundation). To determine the amount of materials, you need to clearly know the width and depth of the tape, which, in turn, will depend on the soil and the mass of the higher structure.

Below we will try to clarify the possibility of such calculations, as well as see the video in this article corresponding to this topic.

Monolithic strip foundations

What is a strip foundation

• To understand how to calculate - how much concrete you need on a foundation, you need at least to imagine its structure and geometrical parameters. Pay attention to the picture above - there you see an image of the tape in the section along with the sole, base and reinforcement cage, but the base does not always represent a separate element - it can also be just a part of the solid tape itself protruding above the ground.
• In addition, the instruction does not provide for an expanded sole (as in the upper image) as a mandatory element - this option is most often used when the foundation is laid not in the trench, but in the foundation pit. In such cases, formwork is needed for the entire tape, and a suitable trench is dug for the sole.
• You also need to determine whether the base will be buried or low-buried, since it is possible to calculate the amount of concrete for the foundation only by representing its depth and width.. The distance from the ground surface to the sole of the tape is determined primarily not by the weight of the higher structure, although much attention should be paid to this, but by the condition of the same ground, which in this case can be divided into two categories - heaving and non-dull.
• Even if the higher structure will be made of foam concrete blocks, this still does not mean that a sufficiently low-depth foundation (40-60 cm) is enough for it - on the heaving soils such tape waits for subsidence or twisting, which will lead to the destruction of the building box. Therefore, here the calculator - how to calculate the volume of concrete on the foundation, will proceed from a deeper construction.

Note. The small or large depth of the concrete foundation is determined, rather, not by certain figures, but by the freezing of the soil in a particular region. The depth of the tape (in-depth version) is calculated from the freezing point, that is, it should be below this point by at least 1/3 of its size, but it is best if it is?

Making concrete and its quantity

The upper tables show how to prepare a concrete solution for the foundation, that is, there are provided the proportions of ingredients for 10 liters (bucket) of the finished mixture, therefore, using this cheat sheet, you can learn how to calculate the concrete cube for the foundation.

As you know, in one cube - 1000 l, then the ingredients (sand, gravel, cement) need to be multiplied by 100, and then we get 1m³ solution. For our situation, the 300 brand with any cement will be the best fit, so all calculations will be based on an eye to such a composition.

Recommendation. In the manufacture of concrete with their own hands, first of all you need to dissolve the required amount of cement in water and only then add sand and gravel to the concrete. Practice and observation of concrete showed that such a sequence significantly increases the strength of the mixture and the life of the monolith.

We continue to talk about how to calculate the amount of concrete for the foundation and we need to know its dimensions and for this we have a project to build a house, because in any case you will not start work until you have such a document on hand.

In this case, it is possible to calculate the volume, even without starting earthworks, since the project is made up taking into account the characteristics of the soil and the mass of the future building, therefore, the width and depth of the trench are already known to us.

Imagine that we have a 60 cm wide trench 100 cm deep (quite common parameters for a two-storey country house) - its perimeter may be different - everything depends on the area of ​​the future building. Therefore, we will take only a part of it, 10 m long. Therefore, such a section of the trench will have 0.6 * 1.0 * 10 = 6 m³ and pouring it will require the same amount of concrete.

Please note that in this case the base and / or the additional sole is not taken into account, but if it is, then they should simply be added to the total volume.

Now we understand how to calculate - how much concrete is needed on the foundation, but let's see how this affects the number of ingredients for a certain section of the monolithic tape. As we said, we are interested in concrete of grade 300, and if we use cement M400, then, according to the table, 1 kg of cement, 1.9 kg of sand and 3.7 kg of crushed stone are needed for 10 l of mortar.

Then it will take 1 * 100 = 100 kg of cement, 1.9 * 100 = 190 kg of sand and 3.7 * 100 = 370 kg of crushed stone per cube of solution - multiply each of the ingredients by the number of cubes and you will receive the necessary figures for the preparation of materials Moreover, you will immediately see their total price.

Note. For monolithic strip foundations, diamond drilling of holes in concrete and cutting of reinforced concrete with diamond circles is carried out in accordance with State Standards and SNiPs intended for processing monolithic and structural concrete.

Conclusion

We talked about how to calculate the concrete for the foundation by the size of the trench or formwork, but did not mention the area with a slope. Therefore, if the trench depth is different, the average indicator is taken as the unit of reference. Successes!