Concrete heating technology: features of construction in

19-02-2018

Building

With the onset of cold weather, many construction sites either close down or move on to work that can be performed in a given period of time without disrupting the process. However, installation with the use of liquid mixtures based on cement is sometimes very difficult to postpone without stopping the entire production and cannot be performed at sub-zero temperatures. Therefore, a special technology of concrete heating has been developed, allowing to cope with the task in any frost.

Amateur photo, the process of concreting in the cold, which uses a heated solution that can be seen by evaporation

Kinds

Для начала необходимо сказать о том, что на сегодняшний день существует множество различных методов поддержания температуры в растворе. Все они обладают своими определенными характеристиками и соответствующей стоимостью. Однако профессиональные мастера рекомендуют обратить внимание на четыре наиболее популярных из них (см.также статью «Прогрев бетона в зимнее время: основные методы»).

The need to perform work in the cold season makes it necessary to solve problems related to the time of hardening of concrete structures and their quality.

Reason

First of all, it should be noted that, to begin with, a process map is created for heating concrete with wires or other selected means, which fully describes all the process cycles and the temperature in them.

In this period of the year, it is best to order an already prepared solution with the addition of special additives and heating.

The fact is that all such an operation is performed only in order to speed up the hardening of the mixture and save it from the appearance of air bubbles, which are caused by the freezing of water.
Considering all this, it is necessary not only to heat the composition, but also not to allow the temperature to become too high. Therefore, when using active funds, you need to acquire special regulators and controllers.

Tip! Professional masters recommend not trying to do such work yourself, if there is no appropriate skill or education. It is best to entrust this matter to professionals, the main one of which should be the designer.

Thermos

It is believed that this technological heating of concrete is the simplest and does not require large financial costs.

However, it is not always suitable for severe frosts and does not allow for constant monitoring.

Sawdust often falls asleep on top of a covering film and, when the humidity is low, they start to generate heat and carry out a kind of heating.

It is based on the fact that first waterproofing is placed in the formwork with a reflective surface inside. Also in advance prepare the same material for covering the structure.
After that, the solution is heated to a temperature of 75 degrees and, adding antifreeze additives to it, is poured into the mold..

This method is great for small constructions or vertical products.

At the next stage, the installation manual requires closing the surface with maximum tightness, which will create a thermos effect.

Tip! You can also put on the rags soaked in ammonia solution, which also increases the rate of hardening of the composition.

Warm formwork

This method is based on the fact that when creating a mold for casting use special panels that have the ability to raise and maintain the temperature.

It is worth noting that on such a warming up of concrete flow chart is not required. It is very conditional and is suitable only for products with small dimensions.
Special attention is given to the fact that there are special panels for such use, which are reusable and have a certain shape.

Tip! This method is very well suited in the manufacture of staircases, since some companies create special panels of such geometric proportions, as well as marches. They are easy to use and quite practical.

The PNSV wire is specially designed for heating concrete during its pouring and subsequent cooling.

Cable heating

It is worth saying that the price of this method is quite high, but it is he who is the most efficient and reliable.

Thanks to him, all constructions were built in modern Moscow, not paying attention to the season and cold weather.

Quite often for this type of work they use a KDBS cable, which has a high cost, but it has good flexibility and it tolerates minor voltage drops well.

This method requires a pre-prepared project, which must indicate the brand of cables and control devices used.
The essence of this heating is that the heating elements are placed in the formwork in a certain way, using coils or a spiral. After that, they are connected to the control equipment.

Special equipment designed to control the temperature and supply a certain voltage to the cable according to a given program

It should be noted that this method is better not to be reproduced with your own hands. It requires a certain amount of heating at a specific rate of temperature rise and the same cooling. It is important to constantly ensure that the process proceeds evenly and in the same parameters.
It is important to remember that after hardening the cable will remain inside the structure and will become a kind of reinforcement.

Tip! This method is better not to use when creating reinforced products or to wrap the heating element directly on its structure, since iron has a greater degree of expansion when heated, and may appear tightening or cracking.

The control and voltage supply equipment must be located in sealed cabinets and access to it must be restricted

Electrode method

The principle of operation of this method is based on the use of electric current, which will be directed from one electrode to another.

At the same time, it is not necessary to use diamond drilling of holes in concrete or other principles of fixation, since they fix the contacts on special stands or directly on the formwork.

It should be noted that this technique is also very effective and does not require large financial expenditures. However, in order to create the necessary magnetic field that would heat the solution, it is necessary to precisely place all the electrodes in the correct position and at a certain distance from each other.
It is worth noting that some types of such contacts imply a subsequent withdrawal from the structure, although they mostly remain inside the product, which should be taken into account if later it is planned to cut the reinforced concrete with diamond circles.

Tip! This technique uses open currents that can affect various devices and even simple wires inside the building. It is therefore very important to comply with all safety requirements and strictly follow the instructions of the manual.

Warming up with electrodes is suitable for creating small products or when working with sections.

Recommendations

When using a cable for heating, professional craftsmen try to lay it right out of the reel with coils to prevent kinks or breaks.
When warm formwork is used, it is recommended to wrap it in heat-resistant film in order to prolong the life of this structure.
The thermos method is best combined with other heating systems in order to achieve maximum effect even in the most severe frosts.
Quite often on the construction site there are large voltage drops. Therefore, experts advise using a voltage regulator to protect the system and be able to make adjustments.

If for these works not to use special stations, then it is worth including various protective devices and grounding in the circuit

Conclusion

After reviewing the video in this article, you can get more detailed information about this type of manufacturing of concrete structures. Also, taking into account the article proposed above, it should be concluded that such work can be performed even at sub-zero temperatures, which is very effective in some regions of the country (find out here how concrete is used at the construction site).