30 Dec Methods of concreting in winter
In the case of concrete work in the cold period, the main difficulty is to freeze the water contained in concrete. Due to the destruction of the structure of the concrete who did not have time to harden the crystals of ice, his strength characteristics worsen. In order to avoid the deterioration of the quality of concrete, it is necessary to follow the rules of winter concreting. When using a concrete mixture without turning on the anti -control additives, it must be prepared using heated water. To reduce the loss of heat contained in the concrete mixture during transportation, it must be brought directly from the manufacturer, without overload. Loading and unloading should be carried out promptly, and transport containers should be insulated and heated. The base before laying concrete must be thoroughly cleaned and warmed up to a positive temperature. The laying of the concrete mixture should be carried out continuously until the concreting of the entire array is completed.
Street infrared heaters are indispensable when a mobile heat source is required.
They do not require special installation, are easily installed and disassembled, easily transported thanks to their small dimensions and weight. Infrared heaters work on liquefied gas (propane). Infrared heater is one of the safest and most economical methods of heating. They warm with the help of infrared rays, which heat not air, but people and objects in the radius of infrared waves.
Otherwise, the mixture will cool down prematurely, so that the block will not be monolithic. At the end of the laying of the mixture, its surface must be immediately insulated with mats or shields. The concrete mixture can include anti -control additives. In this capacity, Potash, sodium chloride in conjunction with calcium chloride, sodium nitrite and other substances are used. Transportation of concrete containing anti -control additives can be carried out without insulation of the container with the mixture. Before laying the mixture in the formwork, it should be heated with steam or electric current. After laying, concrete can also be heated, including using an infrared heater. When heated, the temperature of the concrete surface should not overheat above ninety degrees Celsius. When the air temperature drops below twenty degrees Celsius, it is recommended to use thermactive formwork to heat concrete to heat concrete.