Mainly used in the temperature - 10 ℃ above, and artifacts are not large and thick.By heating the air around the concrete members, the heat is transferred to the concrete, or directly heating the concrete, so that the concrete can normally harden under normal temperature conditions.

①Furnace heating.Generally used in smaller sites, the method is simple, but the indoor temperature is not high, relatively dry, and the release of carbon dioxide will make the surface of newly poured concrete carbonization, affect the quality.

②Steam heating.Concrete is made to harden by steam in hot and humid conditions.This method is easy to control and the heating temperature is uniform.But because it needs special boiler equipment, the cost is higher.The heat loss is large and the working conditions are not ideal.

③ electric heating.By using a steel bar as an electrode or an electric heater affixed to a concrete surface, electrical energy is converted into heat energy to raise the temperature of the concrete.This method is simple, convenient, less heat loss, easy to control, the deficiency is large power consumption.

④infrared heating.The concrete is sealed by high temperature electric heater or gas infrared ray generator.

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