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远红外线就是波长为2.5～1000μm的电磁波。电热远红外线养护混凝土工艺,就是将涂有远红外线辐射材料的辐射器,安装于混凝土表面或混凝土制品底模下,通电后,利用电能通过高温电热远红外线辐射器发出的远红外线电磁波直接对混凝土辐射传热或隔模辐射传热。因远红外线电磁波在穿透空气时以每秒30万km的速度传热,几乎没有热能损失。它同可见光一样,具有辐射定向、穿透、反射和吸收等基本性能,同时混凝土内水分子波长在2.5～3.5μm、5～7μm和14～16μm各有一个很强的吸收峰带。当混凝土内部接受高温远红外线电磁波辐射后,很快将其吸收,消除了自身水化过程中产生的温度梯度,使水分均匀分散在混凝土内部,从而保证湿润养护条件。此外,模板和介质也能吸收能量,并以对流和传导方式传给混凝土体,使其内部温度进一步升高,加速了水化反应,促使了制品早强。电热远红外线养护工艺尤其适用于平窑和折线
Far-infrared rays are electromagnetic waves with a wavelength of 2.5 to 1000 μm. Electric far-infrared rays curing concrete technology is to install the radiator coated with far-infrared radiation material under the concrete surface or under the bottom mold of the concrete product. After the electricity is turned on, the far-infrared electromagnetic wave emitted from the far-infrared radiator by electric energy through electric energy is directly applied to the concrete. Radiative heat transfer or radiant heat transfer across the mold. Since far-infrared electromagnetic waves transmit heat at a speed of 300,000 kilometers per second, there is almost no heat loss. Like visible light, it has basic properties such as radiation orientation, penetration, reflection, and absorption. At the same time, the water molecules in concrete have a strong absorption peak at wavelengths of 2.5 to 3.5 μm, 5 to 7 μm, and 14 to 16 μm, respectively. When the interior of a concrete receives high-temperature far-infrared electromagnetic wave radiation, it is quickly absorbed, eliminating the temperature gradient generated in its own hydration process, so that the water is evenly dispersed inside the concrete, thus ensuring the moist curing conditions. In addition, the template and the medium can also absorb energy, and transmit convection and conduction to the concrete body, so that the internal temperature is further increased, the hydration reaction is accelerated, and the product is promoted early. Electric far-infrared curing process is especially suitable for flat kiln and fold line