Concrete proportions for concrete mixer

Competently prepared cement mortar – pledge of the strength of the structure. From this article, you will learn the right proportions for the preparation of the solution in the concrete mixture, the calculations of the components in buckets and shovels, and how to make a concrete forces for the scene and plaster.

Concrete proportions for concrete mixer

Concrete proportions for concrete mixer

Main proportions

Concrete is the main building material. And so that it is strong and reliable, even in the process of making a solution, it is necessary to clearly represent its purpose.

  • Concrete. Its Components – Cement, Small (Sand) and Large (Crushed) Fillers, Water. Purpose – production of large construction products, filling of large surfaces, the construction of overlaps and other bulk work.
  • Building mixture. Composition – cement, fine filler and water. Rubbank in it no. Scope of application – finishing works, filling of seams and joints, bunch of various elements and finishes, other similar works.

Therefore, before preparing the composition, be sure to consider the appointment. And the ways of cooking, delivery to the destination and supply to the working zone in both solutions do not differ.

Concrete proportions for concrete mixer

Concrete proportions for concrete mixer

Prepare compositions are best in concrete mixers, then a homogeneous structure is guaranteed. In the extreme case, you can knead the spatula, shovel or forks. And to get the necessary characteristics of the product, choose the brand of cement correctly:

  • M100 – the initial stages of the construction of the foundation, road construction, interior decoration;
  • M150 – Pouring screeds;
  • M200 – the manufacture of the foundations of one-storey buildings, the creation of reinforced concrete products, fences, beams (this is the most common cement brand);
  • M250 – construction of small slabs of overlappings;
  • M300 – tape and monolithic foundations of high houses;
  • M350 – the foundation of large buildings and structures;
  • M400 – base floors in monolithic buildings, pool capacity;
  • M450 – Responsible structures, dams and dams on hydraulic structures, construction of underground tunnels, metropolitans.

Digit after the letter “M” is an indicator of the strength of the frozen solution. It shows pressure in kilograms per square centimeter, which will destroy the structure. For example, M300 brand is designed for load no more than 300 kg / cm2.

For household purposes usually take cement brands M200-M300. Their characteristics are quite enough, while maintaining an acceptable cost.

Concrete proportions for concrete mixer

Concrete proportions for concrete mixer

The catalogs often indicate not a brand, but the class of concrete strength:

  • class B7.5 corresponds to the M100 brand;
  • B12.5 – M150;
  • B15 – M200;
  • B20 – M250;
  • B22.5 – M300;
  • B25 – M350;
  • B30 – M400;
  • B35 – M450.

The cement brand (or class) affects the proportions of the components in concrete.

You can prepare a solution in different ways.

Concrete proportions for concrete mixer

Classic concrete

M200 brand cement is usually used (B15). Composition of the mixture:

  • Cement – 2 parts;
  • Crushed stone – 4 parts;
  • Sand – 5 pieces.

Parts are relative units of measurement. It can be kilograms, liters, even shovels. The main thing is that the amount of all components is in one unit of measurement.

This composition is used everywhere. It can be changed – for example, add water so that concrete is better poured the surface.

Concrete proportions for concrete mixer

For Samsosta

Skostka is a waterproof belt around the building. It is constantly undergoing precipitation, so there must be strong. The cement brand for it is M400, and concrete proportions for the kneading mixer:

  • Cement – 1 part;
  • Crushed stone – 5,5 parts;
  • Sand – 4 parts;
  • Water – 0.9 parts.

Concrete proportions for concrete mixer

For pillars of fence

Here the ratio is a little different:

  • Cement – 1 mass or volume fraction;
  • Crushed stone – 4 shares;
  • sand – 2 shares;
  • Water – 0.5 shares.

Concrete proportions for concrete mixer

For foundation

At the initial stage of construction, high strength is required, so the cement M150 is enough. Preparation of the mixture:

  • Cement – 1 part;
  • crushed stone – 7 parts;
  • Sand – 4,6 parts.

For the construction of the main part of the foundation, you need a longer concrete – for example, M300. The proportions are as follows:

  • Cement – 1 part;
  • Crushed stone – 3.7 parts;
  • Sand – 1.9 parts.

Waters need about 0.5 liters.

Concrete proportions for concrete mixer

If the structure should have increased strength, superplasticizers are added to the cement solution. The instructions for their use are indicated on the package, and the required amount depends on the volume of the knead.

If a more durable cement is used (for example, M450), the composition of the mixture will change:

  • Cement – 1 share;
  • Crushed stone – 2.5 shares;
  • Sand – 1.1 share.

In all recipes, the volume of water should be about half of the cement volume.

Of course, this is an approximate recipe. The main goal is to get a dense curl solution, besides enough plastic. And in the desired quantity (for example, exactly 160 liters) so that there is no need to do or have no extra solution.

Concrete proportions for concrete mixer

How to calculate?

When preparing a solution with their own hands, the desired volume of components is taken in standard household buckets of about 10 liters. In some recipes, calculations are presented in kilograms. Therefore, you need to understand their ratio:

  • Cement – 15 kg;
  • Sand – 19 kg;
  • Crushed stone – 17.5 kg.

These are approximate values, real figures depend on humidity, density of the material of the material in the bucket and the size of the fraction.

Concrete proportions for concrete mixer

Concrete proportions for concrete mixer

Concrete proportions for concrete mixer

But you can still calculate the number of components with sufficient accuracy.

For example, you need to do 120 liters for filling the foundation from cement M450. Components such:

  • Cement – 1 share;
  • Crushed stone – 2.5 shares;
  • Sand – 1.1 share.

Then 120 divide the amount of all parts and get 26 liters – the desired number of cement:

  • rubble volume – 26×2,5 = 65 l;
  • Sand volume – 26×1.1 = 29 l;
  • Check – 26 + 65 + 29 = 120 liters.

Concrete proportions for concrete mixer

Concrete proportions for concrete mixer

It should be borne in mind that the finished mixture in volume will be less than the total volume of its components. This is because water and other components occupy areas between rubble. In addition, water evaporates, which leads to a decrease in mass. Then the volume of components need to increase slightly.

Water in the calculations does not participate – most of it will evaporate, and the rest will give a small amount of volume.

This method can calculate the consumption of components for each type of mixture. And any of its volume – 130, 180, 200 liters and more.

When you determine the approximate mass of the components of the concrete, you can start cooking and use. But first a little about how to better knead the mixture.

Concrete proportions for concrete mixer

Concrete proportions for concrete mixer

Concrete proportions for concrete mixer

Recommendations for cooking

It is important not only to competently pick up the composition of the concrete, but also to stir it correctly. This will help you a few tips from specialists.

  • When kneading, do not lean over the machine. When you add the components of the shovel, be careful – rotating blades can hurt the shovel and knock out her. Observe the security technique.
  • When working with dry components, use protective glasses and gloves – cement dust dries the skin of the hands. Do not forget about the respirator.
  • Use only clean materials. Sift sand and cement before work. Check water quality – it should not be garbage. It is best to use distilled water.
  • When working in the cold season, sand and water is desirable to warm.
  • The solution should occupy approximately half the volume of concrete mixer so that it does not fly out of the mixer when stirring.
  • First pour some water into the agitator and turn it on. Water should moisten the walls of the mixer. It is necessary so that the solution does not stick to the walls.
  • Then add most of the rubble. When working, he will break lumps.
  • Add cement, sand and other components.
  • Check the quality of the solution. To do this, pour a small part of it and a shovel Make 4-5 notches. Good concrete will remain smooth, and the peaks between the notches will be saved.
  • Use the finished solution no later than 30-40 minutes, otherwise it solids.
  • Be sure to wash the concrete mixer after use.

Concrete proportions for concrete mixer

Concrete proportions for concrete mixer

Concrete proportions for concrete mixers in the video below.

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