Study on improving the durability of concretes with slag and activator

An equivalent amount of metallurgical slag, water-quenched slag powder and activator was substituted for a part of the cement to prepare concretes at strength grades of C25, C30 and C40. Due to the filling effect, pozzolanic effect, micro-aggregate effect, and improvement of pore structure, the prepared concretes not only had greater strength compared with reference concrete, but also had greater impermeability and frostresistance. Moreover, the expansion reactions between alkali and aggregates were effectively inhibited. The slag and activator can serve as the raw materials for green concretes.