Quality control of concrete. checking the installation of

The durability and safety of operation of an object under construction completely depends on the provision of high-quality concrete and metal structures. By this is meant a versatile concept, which depends on the properties of the elements that are in the composition of the mixture. We will discuss further what is quality control of concrete at the construction site.

This also applies to the exact observance of the production process, from a technical point of view, and the proper care of the hardening mixture. Each stage of concrete production needs careful control, the price of the finished mixture depends on it.

Required materials for concrete mix and control over them

Enterprises that are engaged in the production of building mortars, use input control, which includes the following:

• verification of documents: passports, forms, certification forms that certify the quality of the supplied solution;
• acceptance of the initial components of all solutions, for which there are rules for monitoring the strength of concrete in accordance with GOST 18105 86 and TU, as well as the insulation of doubtful materials up to the full explanation of the reasons;
• registration of materials in a particular magazine;
• withdrawal of probes for further research and testing;
• consideration of cases when there is a poor-quality product or material;
• issuing an opinion regarding the quality of the solutions. In case of defects, documents must be transferred to certain departments in the enterprise.

Tip: if you made the solution with your own hands for insignificant structures, it is not necessary to carry out quality control.

Concrete transportation is an important process that requires attentiveness, because it is a guarantee that it will not get sunshine, precipitation or wind. During transport, care must be taken to ensure that the mixture does not harden or disintegrate into individual components.

Tip: if you are engaged in construction work and get a concrete solution in a specialized transport, then it must be used as soon as possible to avoid the same hardening or decay.

Such control concerns not only concrete solutions, but also metal products, fittings, proper installation work, and high-quality formwork.

Before you start laying the mixture or mortar, the instruction requires:

• compare formwork size;
• check its correct location;
• joint density;
• the correct ratio of formwork with reinforcement.

It should be clean and the lubrication should be good. In winter, it is necessary to check it for the presence of snow and ice.

Full control of laying mixtures

In the process of concrete laying, you must adhere to the following rules:

• continuously monitor the state of the formwork;
• you should not dump concrete from a height of more than two meters, concreting occurs at a height of 1 m, as for the columns on both sides, the height is from 0.5 to 5 m;
• for the descent of the mixture, you must use the chute or trunk.

Tip: if the formwork has shifted in any direction, the work is stopped, and the design returns to its original position, with great need you can resort to reinforcement.

The quality check of the density of a concrete mix is ​​checked in several ways:

1. Using a radioisotope density meter based on the change in the absorption level of certain radiations in accordance with the density of materials.
2. Using an electric transducer. More suitable for testing large elements of concrete, in this case, the sensor is installed in the vibration zone. When the proper density is reached, a certain signal arises, it can be light or sound.

Check the quality of the finished concrete

1. Fully hardened concrete must be checked with special samples in the form of cubes, which are made at the same time and left to harden under the same conditions.
2. Such a check of the quality of the hardened material is carried out in the laboratory, the data can be found by making a call there.

Tip: Self-determination is a difficult and expensive procedure.

If the installation takes place during the winter period, while using the formwork withstanding the effects of temperatures, it is difficult to contain the sample cubes in the same conditions as the main mixture. In such a situation, conditions must be created artificially, which will be close to real, in order to accurately assess the quality of the concrete pavement, as well as to determine other indicators.

Core drilling using a specific device is used when it is necessary to obtain accurate data on the strength of concrete. The removed specimen is then checked for strength.

All of the above refers to destructive methods of testing quality and strength.

But there are also non-destructive testing methods: ultrasound and mechanics.

1. In the mechanical verification method, experts use a Kashkarov hammer.
2. It is equipped with a special ball, which is pressed against the concrete, then it is struck with an ordinary hammer.
3. After the impact, one imprint of the ball remains on the concrete, and a second imprint appears on the reference rod.
4. Then the obtained prints are compared, the general ratio is found, and then the hardness is determined from the curved lines..

The method of ultrasound diagnostics is based on the fact that the rate of passage of the output waves through the concrete varies. Calibration curves are the main components in assessing the level of strength.

Conclusion

Any construction is a difficult and dangerous event, which depends on the quality of building materials. Therefore, at many sites, in order to carry out all the required procedures for quality control and strength, certain acts are drawn up that are presented to the admissions committee.

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