The composition and proportions of concrete for the foundation

After completing all the necessary work prior to the foundation pouring, builders often have the task of determining the amount of sand, rubble and cement for the preparation of concrete mix. The surplus will have to be poured out, and in case of shortage - time is wasted (which is always not enough) to purchase, deliver and mix additional materials.concrete proportions for the foundationIt is clear that I would like to avoid this and make it so that the consumption of concrete on the foundation was optimal. In addition, the ratio of components in the prepared mixture has a great influence on the strength of the future building or structure. The proportions of concrete for the foundation are different. How do they differ, which are better suited for country building - this will be discussed in this article.

The proportions of concrete for the foundation

The composition of the mixture for pouring the foundation includes: cement (binds the ingredients), water (solvent), sand with gravel (as a filler). Cement in concrete fills the voids between pebbles and grains of sand and binds them together during solidification.Thus, the fewer voids there are, the less cement is required, and therefore gravel of different fractions is usually added to the mixture. Small gravel fills the space between large fractions, and the remaining gaps are filled with sand. Depending on what brand of cement is available, the proportions of concrete for the foundation (ratio of cement, sand and gravel) are usually used in construction: 1-3-5 or 1-2-4.concrete consumption on the foundationThe higher the grade of cement used, the greater the strength the mortar will receive and the less it will be required for the concrete mix. The amount of water for dissolving the components of the solution also depends on this. For convenience, we show the possible proportions of concrete for the foundation in the following table:

Type of concrete

Cement type

How much will a concrete mix of 10 liters of cement

The volume composition of sand and crushed stone (P / Sch) per 10 liters of cement

Mass composition, kg

M100

M-400

78

41 / 61

1ts-4.6p-7.0ch

M-500

90

53 / 71

1ts-5.8p-8.1

M150

M-400

64

32 / 50

1ts-3.5p-5.7

M-500

73

40 / 58

1ts-4.5p-6.6shch

M200

M-400

54

25 / 42

1ts-2.8p-4.8

M-500

62

32 / 49

1ts-3.5p-5.6

M250

M-400

43

19 / 43

1ts-2.1p-3.9

M-500

50

24 / 39

1ts-2.6p-4.5sh

M300

M-400

41

17 / 32

1ts-1.9p-3.7

M-500

47

22 / 37

1ts-2.4p-4.3sh

M400

M-400

31

11 / 24

1ts-1.2p-2.7

M-500

36

14 / 28

1ts-1.6p-3.2sh

M450

M-400

29

10 / 22

1ts-1.1p-2.5sh

M-500

32

12 / 25

1ts-1.4p-2.9

Concrete M100 is used only at the initial stage of construction for reinforcement and all sorts of preparatory work, as well as in the arrangement of roads.For the foundation of a single-story building, the M200 brand is most often used, and in the urban high-rise buildings - the M300 and M350. Knead the concrete in an iron container, concrete mixer, wooden box or in a special flooring of iron, wood and other improvised means. First, mix the dry ingredients according to the selected proportion, and after getting a homogeneous mass, water is added. The result should be a thick, soft mass that is poured into a pre-prepared formwork. If the total estimated volume of the mixture is quite large, the foundation is cast in several passes. At the same time, experts recommend to meet in one day - so the foundation will be as strong as possible.how much concrete is needed on the foundation

Volume calculation

“How much concrete is needed on the foundation?” - the question is also very important. Usually during the construction of a country house, its foundation is arranged according to the tape principle with the use of wooden formwork. For the calculation, you need the tape height, width and its total length. Consider a simple example. Suppose we have a rectangular basement size of 10 x 3.6 m, the height of the casting -0.21 m, and the width of the belt - 0.19 m. At the beginning is the perimeter: 2 * 3.6 + 2 * 10 = 27.2 m.Then it is multiplied by the width and height of the casting. The result is 1,0853 m3. We hope that now with the choice of proportion and calculation of the required volume of the concrete mix, there will be no difficulty.

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