Today, concrete is often used in construction, but the construction process itself is carried out not only in the warm season, but also in winter, which comes to Russia strictly according to the calendar and lasts a long time. Therefore, the features of the performance of concrete work in the winter season should be told separately.“Winter conditions” in construction occurs at a time when the average daily ambient temperature drops below “plus” 5 degrees Celsius, which happens at the end of September, when at night, it becomes quite cool. If the ambient temperature is shown by a negative mark, then the water that did not react with the cement naturally freezes and turns into the ice, that the quality of the concrete mixture does not add.
One of the most common methods in St. Petersburg at the moment heating concrete in winter is its electric heating. In this case, an electric current is passed through the mixture, for this, special electrodes are immersed in concrete, which conduct an electric current into the mixture.
There is another type of heating of concrete shift, which is carried out using induction heating. In this case, heat is used, which forms reinforcement or steel formwork, to which the electromagnetic field of the coil is connected. In this case, the coil itself is arranged on the outer surface of steel formwork or reinforcement by the turns of the insulated wire.
Use builders and another method of heating the concrete mixture using infrared rays. The following method is based on contact or conductive heating, which is released in the conductor at the time of passing the electric current. Using this method, warming formwork is made. The convective method of heating is also used, which occurs using warm air or hot water steam.