Composition and correct proportions of concrete

Composition and correct proportions of concrete

The correct proportion of concrete used during construction is the key to its strength and reliability. 

After all, today concrete is used in almost all areas: from the construction and arrangement of small private buildings and infrastructure facilities to large-scale residential and industrial construction. 

Criteria for quality concrete

The unconditional criterion for the quality and strength of screeds, floors, walls, foundations, reinforced concrete structures, coatings, etc. is the correct proportions of concrete. After all, it is the main building material. 

If high-quality materials and the correct mixing technique are used at the concrete pouring stage, the structure will serve for many years. Conversely, if low-quality concrete mortar was used during the construction process, it will eventually develop pores that will allow moisture to enter. As a result, the structure will begin to deteriorate, and the building will become unsafe. 

So, if you know how to make concrete proportions according to the technology, you will get a high-quality concrete mix with such characteristics: 

  1. Uniform gray color. If different parts of the concrete element have different shades, it means that the mortar was poorly mixed, and therefore, some of its quality is unsatisfactory. A brownish tint of concrete indicates an excess of sand in it, i.e., a violation of the proportion, which will definitely affect the strength characteristics. A reddish tint indicates the use of low-quality materials during mixing. Yellow color is a sign of clay impurities. 
  2. Thick and inactive consistency. If the concrete is too thin or too thick after mixing, it means that the proportions have been disturbed. 
  3. Homogeneous appearance. High-quality concrete mortar should not contain lumps of sand or gravel particles. 

Types of concrete 

Depending on the area and conditions in which the future concrete structure will be used, the following types of concrete are distinguished:

  • Standard. It is used for classical both residential and industrial construction. In particular, for creating foundations, floor beams, columns.
  • Hydraulic concrete. Such concrete has enhanced waterproof properties, so it is used at facilities where increased exposure to water and precipitation is expected. For example, in the construction of sewer networks, dams, gateways, and canals. 
  • Concrete for pavement. As its name implies, this type of concrete is used for pavement construction. It has enhanced strength and resistance to heavy loads. Therefore, its scope of application includes airfield pavements, roads, sidewalks, and industrial floors. 
  • Special concrete. It is used in the construction of atypical facilities that require certain special characteristics from concrete. For example, protection against radioactive radiation, enhanced acid resistance, or heat resistance. 

In addition, concrete is characterized by its weight:

  • Lightweight (weighing less than 2 tons/m3)
  • Heavy (weighing more than 2 tons/m3)

Concrete mortars are also classified by their composition: 

  • Binding material (cement, slag, gypsum, lime)
  • structure after drying (large-porous, porous, dense)
  • type of filler (dense, porous, special)

Concrete composition

Classic concrete mortar consists of four main components: cement, crushed stone, sand and water.

To choose the right proportions for concrete, you first need to understand what exactly it is needed for. At the same time, the type of cement used, the quality of sand, and the presence of additives are taken into account. 

How are the proportions of concrete calculated?

To understand which proportion of concrete to screed is the best and which is suitable for pouring the foundation, it is important to know that concrete differs in strength and composition. 

Depending on the load that concrete can withstand, its strength is denoted by the letter M, next to which the load factor is entered. The higher the concrete grade (M), the greater the load that concrete can withstand. For example, M100 concrete can withstand a load of 100 kg/cm3, while M450 concrete can withstand up to 450 kg/cm3. 

The maximum level of strength occurs 28 days after the concrete is poured.

When it comes to proportions, it is also important to mix all the concrete components in a clear and correct order.

Proportions of concrete M200

Concrete of this strength is one of the most popular. It is typically used for flooring and floor screeds. The proportions of m200 concrete mean that it can also be used for the construction of small outbuildings. 

The composition of m200 concrete for mortar preparation is as follows: cement, sifted and dried sand, crushed stone, and water. They are used in the following proportions (when using PC-400 cement): 

cement 1 : sand 2.8 : crushed stone 4.8

This is the ideal proportion of concrete for the screed. 

After mixing, the mixture is gradually filled with water, which should make up approximately 20% of the solution. The solution is constantly stirred until the desired consistency is achieved. 

This mixture can also be supplemented with plasticizers, stabilizers or water repellents to improve the technical parameters of concrete for specific construction needs. 

Proportions of concrete M300

Concrete of this class has enhanced strength, frost resistance, and improved moisture resistance. The proportions of m300 concrete mean that it can withstand heavy loads. Therefore, it is used for the construction of foundations, walls, monolithic stairs and slabs, and various reinforced concrete products. 

The composition of m300 concrete for the preparation of the solution is as follows: cement, sand, crushed stone of large and small fractions, water. They are used in the following proportions (when using PC-400 cement): 

cement 1 : sand 1.9 : crushed stone 3.7

These are the most optimal proportions of concrete for the foundation. After all, the proportion of cement here is much higher than for m200 class concrete. 

Plasticizers are often added to the mixture to increase frost and moisture resistance. To strengthen the strength of structures made of concrete of this class, reinforcement is also poured. 

Why is it worth ordering professional ready-mixed concrete from EFE?

EFE's ready-mixed concrete is of perfect quality. During its production, we strictly adhere to the technology: the proportions of concrete are correct and the composition of materials is selected. 

Our concrete is tested in a laboratory using special equipment directly at the production site. This quality check involves pouring the solution into a special container and leaving it for 28 days in a room with an air temperature of +20°C and humidity of no more than 90%. During this time, the product acquires the required strength. The resulting concrete element is then placed in a laboratory press and compressed. A specialist checks the strength level in accordance with the technical characteristics of the concrete.

We understand that each construction project has its own characteristics and requirements. That is why we have developed specialized concrete mix formulations that allow us to ensure high product quality in various conditions and environments.

At the same time, EFE offers logistics and transportation services that are ideally suited for the construction of residential buildings, commercial buildings, and infrastructure facilities: 

  • For hard concrete, transportation is provided by MAN dump trucks; 
  • For conventional concrete, transportation by MAN concrete mixers is available. 

The service of concrete delivery by MAN concrete pumps at the construction site is also available. 

Another exclusive service of our company is the installation of a mobile concrete plant with a capacity of 50 m³/h. EFE offers interested partners a mobile equipped complex designed to produce concrete directly at the construction site. 

By choosing ready-mixed concrete from EFE, you get a concrete composition that is guaranteed to be reliable, high-quality and durable. This means that it will definitely withstand the planned loads.