Why is the lime gypsum, water glass glue was air hardening material
Gypsum is a monoclinic mineral, a hydrate whose main chemical component is calcium sulfate (CaSO4). Gypsum is a wide range of industrial materials and building materials. It can be used as cement retarder, gypsum building product, model making, medical food additive, sulphuric acid production, paper packing, paint filling, etc..
A rigid inorganic cementitious material consisting mainly of calcium oxide. Lime is a product of calcium carbonate, such as limestone, dolomite, chalk and shell, which is calcined at 900~1100 degrees centigrade. Lime is one of the earliest cementitious materials used in human life. Lime is widely used in civil engineering and can be used in medicine in our country. To this end, the ancient theme of "lime" as the theme of poetry, singing the praises of the ages.
The microporous structure and heat dehydration of gypsum and its products provide excellent sound insulation, heat insulation and fire resistance.Commonly known as sodium silicate [1] base, is a kind of water soluble silicate aqueous solution, commonly known as water glass, is a kind of mineral binder. Its chemical formula is R2O. NSiO2. In the formula, R2O is an alkali metal oxide, and N is the ratio of silica to alkali metal oxide molar number, which is called water glass friction number. Water glass commonly used in building is aqueous solution of sodium silicate (Na2O. NSiO2).
Because they can only harden in air (dry conditions) and maintain or continue to develop their strength of cementitious material. This material is not suitable for use in wet conditions, nor in water.
