砖砌体在砌筑1～3个月后,在砖的表面就出现了一种白色的粉末,呈絮团状或絮片状(俗称泛霜)。厚度在0.5～8毫米之间,味咸微苦,易溶于水,粘土砖大都以高岭土为主,主要成分是三氧化二铝和黄铁矿。三氧化二铝是防止石灰爆裂及保证砖稳定性的有效成分。然而高岭土中除含黄铁矿和三氧化二铝外,还有形成泛霜的元素钾和钠。目前砖的焙烧大多以内燃砖为 After bricklaying for 1 to 3 months, a white powder appears on the surface of the brick, showing a floc-like or flaky (commonly known as pan-cream). The thickness is between 0.5 and 8 millimeters. The taste is salty and bitter, and it is easily soluble in water. Clay bricks are mainly based on kaolin. The main components are aluminum trioxide and pyrite. Al2O3 is an effective ingredient for preventing lime burst and ensuring the stability of the brick. However, in addition to pyrite and alumina, kaolin also forms the elements of potassium and sodium. At present, bricks are mostly baked with internal combustion bricks