粉煤灰活性激发方法探讨

试验研究了粉煤灰活性的物理激发机理以及粉磨时间，助磨剂，化学激发剂对粉煤灰活性的影响，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，粉煤灰的水化首行从玻璃体的断裂面开始。对粉煤灰进行磨细加工既增大了粉煤类的比表面积，又增加了粉煤灰玻璃体的断裂面，可以明显提高其水化活性，粉煤灰高细粉磨需要掺合适品种的助磨剂，不同助磨剂对物料适应性不同，掺加适当的激发剂也有助于促进水泥和粉煤灰的早期强度。

Discussion on activating method of fly ash

The mechanism of physical activatin g of fly ash and the effect of grinding time,grinding aid and chemical activator on reactivity of fly ash were studied.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.Fine grinding can improve the hydration activity of fly ash ow ing to increased specif-ic surface area and glass fracture su rface.Proper type of grinding aid is needed in fine grinding of fly ash.Di fferent grinding aids have different adaptability to grinding material.Adding proper activator to fly ash redounds to raisin g early strength of ce-ment.