目前，采用粉煤灰作掺合料的主要问题是早期强度低，加上我国粉煤灰质量不稳定（大部分属于Ⅱ、Ⅲ级灰），需水量大，也成为阻碍粉煤灰高掺的一个大问题。我们对粉煤灰进行了活化处理，同时复合掺加矿渣及减水剂，以期避免上述缺点。１试验原材料（１）水泥：大同云岗Ｐ．... At present, the main problem of using fly ash as admixture is that the early strength is low, and the quality of fly ash in China is unstable (most of them belong to Grade II and Grade III ash), and the water demand is large, which has also become a hindrance to the high admixture of fly ash. A big problem. We activated the fly ash and added the slag and water reducing agent in combination to avoid the above shortcomings. 1 Test raw materials (1) Cement: Datong Yungang P. ...