许多建筑物墙面,尤其是雨蓬和墙连结处、屋面排水口处墙面及现浇混凝土梁柱外墙面,也就是在施工过程中浇水多及雨后积水排除缓慢或少量存水处的墙面,待墙面干燥时常常出现一层白硝状的物质,一般称这种现象为“泛碱”或“泛白”。厚度一般为2～3毫米,无论是新交工的或使用多年的建筑物,一般均有此种现象。墙面为什么会泛碱形成不规则的“白硝”状呢?这主要是因为制砖的原材料土壤中含有一定量的可溶性盐类,如硫酸钾、硫酸钠、碳酸钠、碳酸钙和硫酸钙等。这些可 Many building walls, especially the joints between the canopy and the wall, the wall surface at the roof outlet, and the external wall surface of the cast-in-situ concrete beams, that is, watering during the construction process and accumulation of water after the rain are eliminated slowly or in small quantities. At the wall of the water, when the wall is dry, a layer of white nitrite-like material often appears. This phenomenon is generally referred to as “alkaline” or “whitening.” The thickness is generally 2 to 3 mm. This phenomenon generally occurs in buildings that have been newly constructed or used for many years. Why does the efflorescence of the wall form irregular “white nitric oxide”? This is mainly because the raw materials of the brick contain a certain amount of soluble salts such as potassium sulfate, sodium sulfate, sodium carbonate, calcium carbonate and calcium sulfate. Wait. These can be