In the construction gypsum dihydrate gypsum is contained in what is the reason?

                   In the construction gypsum dihydrate gypsum is contained in what is the reason?

Shi Xiao second half water gypsum often contains a small amount of water, the main cause of dihydrate gypsum has two: one is calcined half water gypsum when temperature is too low, the center of the granular material 2 water stone side no dehydration, left in the half water gypsum; Second is the half water gypsum deliquescence in transportation, storage of dihydrate gypsum. In gypsum dihydrate gypsum hydration process coagulant function, more make the dihydrate gypsum retarder amount multiplied, they couldn't even adjust the ideal setting time. Single-phase type plaster gypsum production, therefore, must be strictly controlled two water stone 竒 phase, namely adopt the method of burnt when calcination, again through the aging treatment, packaging, transportation and storage are strictly forbidden to be affected with damp be affected with damp, in the event of a half water gypsum deliquescence, cannot be used for plastering gypsum.