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氨主要来自建筑施工中使用的混凝土外加剂
氨主要来自建筑施工中使用的混凝土外加剂：特别是在冬季施工过程中，在混凝土墙体中加入尿素和氨水为主要原料的混凝土防冻剂。这些含有大量氨类物质的外加剂在墙体中随着温湿度等环境因素的变化而被还原成氨气从墙体中缓慢释放出来，造成室内空气中氨的浓度大量增加。
Ammonia mainly comes from the concrete admixture used in the construction: especially in the winter construction process, the concrete antifreeze with urea and ammonia water as the main raw materials is added to the concrete wall. With the change of temperature and humidity and other environmental factors in the wall, these admixtures containing a large amount of ammonia are reduced to ammonia gas and slowly released from the wall, resulting in a large increase in the concentration of ammonia in the indoor air.
Ammonia mainly comes from the concrete admixture used in the construction: especially in the winter construction process, the concrete antifreeze with urea and ammonia water as the main raw materials is added to the concrete wall. With the change of temperature and humidity and other environmental factors in the wall, these admixtures containing a large amount of ammonia are reduced to ammonia gas and slowly released from the wall, resulting in a large increase in the concentration of ammonia in the indoor air.
