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# How to calculate the amount of concrete for the foundation

## How to calculate the amount of concrete for the foundation

The key information that is needed to calculate the concrete on the foundation is its type (tape, columnar or tile) and configuration. In turn, the type of foundation is selected on the basis of soil morphology, hydrogeological conditions of the area and the construction project itself. In some cases, it is advisable to use the foundation blocks and waterproofing the foundation, in others - cast concrete or columnar structures. Having decided on the type of structure and having a sketch of the object on hand, they begin to calculate the cubic capacity of concrete on the foundation.

Calculation of concrete on a strip foundation To calculate the amount of concrete for the foundation of this type, you need to know the dimensions of the tape:

Width Height (the depth of the foundation plus the height of its aerial parts) Total length (perimeter of the external walls plus the length of the internal) Consider how to calculate the amount of concrete on a strip foundation, for example. We take the total length of the tape equal to 30 m, the width is 0.4 m, and the height is 1.9 m. Then the total concrete consumption is calculated as follows: 30 × 0.4 × 1.9 = 22.8 m3.

Calculation of concrete on a column foundation

To find out how much concrete is needed on a foundation of columns, you need to know their height and cross-sectional area. To calculate the cross-sectional area of ​​a square or rectangular pillar, multiply its width by length. The area of ​​a round column is calculated by the formula: S = 3.14 × R2 (R is the radius of the column).

For example,

the diameter of a round column is 0.2 m, then its cross-sectional area will be: 3.14 × (0.1) 2 = 0.0314 m2. At a height of 2 m, the volume of the column is: 0.0314 × 2 = 0.0628 m3. If the section of the column has a complex shape, its area is calculated by the corresponding mathematical formula. To calculate the total concrete consumption for the entire foundation, multiply the resulting number by the number of columns.

Calculation of concrete on a slab foundation

To calculate concrete on a foundation from a slab, it is necessary to know its volume. To do this, multiply its area by thickness. For a house of 6 × 6 m, the area of ​​the slab is 36 m2. The minimum thickness for the structure is 0.1 m. The volume of concrete for pouring the slab in this case will be: 36 × 0.1 = 3.6 m3.

Slab foundation pouring

How to calculate the cubic capacity of concrete on a slab foundation in the presence of stiffeners? To do this, find out their volume - multiply the cross-sectional area by the total length, then the resulting number is added to the volume of concrete spent on pouring the slab

Component consumption per 1 cube of solution

When the volume of concrete on the foundation is calculated, the flow rate of its individual components is calculated. The optimum ratio of cement, sand and gravel for pouring the foundation is 1: 3: 5.
Consumption of material depends on the brand of cement.

Cement.
With a standard bag volume of 50 kg per 1 cube of solution, about 330 kg or less than 7 bags are required. Sand. Given the proportion, then about 1 ton of sand will need about a ton of sand. Rubble. About 1650 kg of crushed stone is used per 1 m3 of concrete. It is also worth considering that the preparation of a cubic meter of concrete will require 160-170 liters of water. Note! Calculation of the solution on the foundation cannot be done with high accuracy, therefore, it is always worth adding 10% to the calculated volume of the solution.