The proportions of concrete for the foundation

The quality and purpose of the concrete mix will depend on the proportions of the composite materials of the concrete for the foundation. That is why the proportions should be precisely adjusted and calculated.

Composition

Concrete mix for the foundation consists of:

  • sand;
  • gravel;
  • binder;
  • cement.

The solvent is ordinary water.

In this mixture, cement is needed in order to fill the empty space that forms between gravel and sand. Also cement binds them during hardening. The less voids are formed, the less cement is needed to make a concrete mix. In order to not have so many such voids, you need to use gravel of different sizes. Due to this, it turns out that smaller gravel will fill the space that is between the gravel of large fractions. The rest of the empty space can be filled with sand.

 Cement is poured foundation

Based on this information, the averaged proportions of concrete for the foundation were calculated. The standard ratio of cement, sand and gravel is 1: 3: 5, respectively, or 1: 2: 4. The choice of a particular option will depend on the cement used.

Brand cement indicates its strength. So, the higher it is, the less cement you will need to take to prepare the mixture, and the higher its strength. The amount of water will also depend on the type of cement.

Other materials also affect the quality characteristics. So, its strength depends on the selected sand. Very fine sand and high clay sand cannot be used.

  1. Before you make a mixture for the foundation, you need to check the quality of the sand. To do this, add some sand into the transparent container with water and shake it. If the water only becomes slightly cloudy or remains transparent at all, the sand is suitable for use. But if the water becomes very turbid, then the use of such sand should be discarded - there are too many silty constituents and clay in it.
  2. For mixing the mixture needed concrete mixer, iron tank, or special. hand made flooring.
  3. When constructing a flooring, it is important to ensure that no impurities get into the mixture, since they will break the composition and adversely affect its quality.
  4. Initially, the main ingredients are mixed until a dry, homogeneous mixture is obtained.
  5. After that, observing all proportions, add water. To find out the exact proportions of cement, sand, rubble and water for the manufacture of cement look at the relevant tables from our other article. As a result, the mixture should turn into a thick, viscous mass. In the next two hours after production, it must be poured into the formwork for the foundation.
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Information provided for reference purposes. For construction issues, always consult a specialist.

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