碱对粉煤灰活性激发的研究

A Study on the Activation of Fly Ash Exited by Alkal

粉煤灰活性较低，与ＣａＯ反应极慢，在强碱条件下，可与Ｍ＾＋反应生成活性Ｍ２Ｏ．ＸＳｉＯ２．ａｑ；然后再与液相中ＣａＯ反应生成水化产物并释放出Ｍ＾＋，Ｍ＾＋继续与粉煤灰反应，重复进行上述反应，直至水化完毕，上述反应进行较慢，直至７ｄ才明显发生，因此，提高粉煤灰将体早期强度的途径之一，应是引入合适的早强组分。

With lower activition,flyash reracts on CaO very slowly.Active M2O·XSiO_2·aq can be produced by the reaction of fly ash on M￣+ in alkaline condition,reaction on CaO in liquid phase to prpoducehydrate and to release M￣+ which react on fly ash.The above reaction is repeated till the hydration iscompleted. The reaction is relatively slow, not happening abviously until 7d. As a result, one of the way to improve the early strength of the paste of fly ash system is to introduce early strength component.