Research on Composite Cement with Steel Slag and Fly Ash

By adding small amount of activator to steel slag-fly ash-clinker system,high-strength composite cement with high content of blend materials was successfully prepared.Effects of the granularity of steel slag,mix proportions as well as activator on the properties of SCCC were investigated.Hydration products of steel slag cement and micro structure of hardened paste were investigated by SEM and XRD.The results show that the optimal surface area of steel slag is about 310m2/kg,the activity of steel slag was enhanced significantly and the early properties of steel slag cement was remarkably improved,and the setting time was shorten sharply.But the hydration products of composite cement were influenced slightly.