对凝结非常迅速而不利于施工的半水石膏而言，杂质的缓凝具有利用价值。
The fast setting of most building gypsum is unfavourable for construction. So the retarding effect of impurities can be utilized positively.
选取硫酸钾作为激发剂对天然硬石膏进行活性激发，并分别掺入硅酸盐水泥与半水石膏进行改性。
Choosing potassium sulfate as an activator to stimulate the activity of natural anhydrite, and modified its properties by adding Portland cement and hemihydrate gypsum respectively.
干热养护是半水石膏粉煤灰胶结材硬化体的最佳工业养护方式；半水石膏粉煤灰胶结材硬化体最适合干湿循环热养护。
Hot curing in 70 C dry-air is the optimal industrial curing mode and the best curing mode is hot wet-dry cycle curing of hardened hemihydrate gypsum-fly ash paste.
半水石膏凝结硬化很快，其初终凝时间为6 ~30分钟，可操作时间只有5 ~10分钟，往往不能满足石膏基材料的成型与施工的需要。
Setting time of gypsum plaster is very short, usually only 6 ~ 30 min, and operation time is only 5-10 min, which cannot satisfy the practical plastering and construction of gypsum-based material.
半水物硫酸钙可以用来代替石膏。
半水物硫酸钙可以用来代替石膏。
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