Commodity concrete - advantages, types, composition and

The use of concrete mix during construction work makes it possible to solve problems of any level. In this case, there are two options - apply dry, which is diluted with water directly on the working platform, or ready, delivered directly to the place by special cars. In this article we will look at the second option, find out what concrete concrete is according to GOST and where it is most often used.

What it is

Ready concrete mix (AAH) is called commodity concrete.

It is obtained by mixing together the necessary components:

• cement (astringent mineral substance);
• placeholder;
• water.

The proportions are determined directly at the plant, which provides the necessary compaction and hardening of a certain type of concrete. This material is an alternative to other cement mortars, which are often prepared with your own hands right at the construction site.

This is due to the fact that the production of ready-mixed concrete takes place with special control at each stage, starting from the preparation of high-quality raw materials to the finished product.

Tip: the greatest benefit from the use of ready-mixed concrete appears when it is laid with a certain time interval and with small amounts of construction work.

Benefits

The product has indisputable advantages over cement mixtures, made directly on construction sites. Its main feature, which is especially appreciated by consumers, is the high quality of the material, which is practically unrealistic to achieve in “field” conditions, from which the cost of ready-mixed concrete is correspondingly higher.

This is possible only at special concrete plants or nodes where it is possible to fulfill certain requirements, in particular:

• prevent dirt from entering the aggregates;
• maintain constant monitoring by the employees of the composition of the mixture at the time of its manufacture;
• maintain the required temperature during the cooking process, regardless of the weather and time of year;
• use only quality ingredients;
• apply the exact ratio of the proportions of all components (sand, gravel, cement, water), which requires instruction;
• follow strictly the order of the technological process.

Tip: You should not spend money on the acquisition, the so-called. ready-mixed concrete, manufactured outside the factory, you just "throw them to the wind." Remember, a product of excellent quality can be purchased only at modern concrete plants, where there is a real opportunity to adjust the technological process that will meet the requirements and standards of GOST.

Kinds

Product classification directly depends on:

• material structures;
• типа placeholder;
• density of cement used.

Also affects the final composition of the scope of concrete and its required strength.

In this regard, the product is divided into:

• heavy type;
• light;
• special purpose.

In turn, in heavy concrete, two types can be distinguished:

• building ordinary;
• especially heavy.

Composition and use

Let us consider in more detail the composition of the material, and where it is most often used:

1. Construction ordinary concrete has a density in the range of 1900 - 2500 kg / m³that corresponds to the brands M-250 and M-300. It is often used in civil and industrial construction sites.

Fillers in it are the most common materials, among which is found:

• gravel;
• diabase;
• limestone.

If the density of concrete with rubble is located in the range of 1600 - 1900 kg / m³This type of product is considered to be lightweight and can often be seen in the construction of private households.

Tip: if you need to dismantle structures made of concrete or reinforced concrete, this is done by cutting reinforced concrete with diamond wheels of special strength.

1. Particularly heavy concrete grades - M400 and M450 are used in construction:

• bridges;
• roads;
• dams

as well as other massive structures and structures. The price of the product is significantly higher than the usual options.

In this case, for the production of very heavy concrete is used:

• barite aggregates;
• iron ore, for example, magnetite and limonite;
• steel filings and shavings.

This makes it possible to ensure the density of the material over 2500 kg / m³. The strongest filler is considered to be granite, which has high rates of water resistance and frost resistance. Thus, the material receives the necessary properties for the construction of the roadway.

1. Lightweight concrete has the mark M100 and M200 and is used to:

• preparatory work;
• create a cement pad under the foundation;
• preparation of the place under the curbstone;
• create a plot before paving the roadway.

Remember, the "lightness" of concrete is determined by the density of its aggregate.

In this case, apply:

• keramzit;
• tuff;
• expanded slag;
• pens

Other porous materials are also used. In the manufacture of cellular building blocks used particularly lightweight concrete, for example, foam concrete or aerated concrete, resulting from special methods of expansion.

Tip: if it is necessary to make technological channels in the wall, ceiling or foundation, diamond drilling of holes in concrete with particularly durable crowns is used.

1. Structural concrete belongs to special materials. It is used to create reinforced concrete products and fill reinforced concrete structures, piles, walls, floor slabs. The use of a steel lattice frame requires a filler of a smaller fraction, the size of which varies from 3 to 10 mm in order to ensure the free passage of the solution through its cells. So it is possible to exclude the formation of air pores and voids.

Conclusion

The article addressed the following issues - what is ready-mixed concrete, its types and use. It is safe to say that it is very different from the usual product, which is made directly on the construction site, where it is not possible to fully comply with the technological standards.

The video in this article will help you find additional information on this topic.