The results show that the glass of ra w fly ash has an inert surface and low h ydration activi-ty.The hydration starts from fractu re surface.

• 结果表明,原状粉煤灰的玻璃体表面存在一层惰性表面层,水化活性很低,粉煤灰的水化首先从玻璃体的断裂面开始。