Properties of pervious concrete with steel slag as aggregates and different mineral admixtures as binders

As one kind of solid waste produced during steel smelting, steel slag can be used as aggregates to produce pervious concrete. This paper focused on the effect of binder-to-aggregate ratio and different binders on the properties and microstructure of pervious concrete made with steel slag as aggregates. The results show that increasing binder-to-aggregate ratio improves the mechanical properties, but decreases the connected porosity and water permeability coefficient. Compared with those of the reference pervious concrete with only Portland cement as the binder, the compressive strengths of pervious concretes incorporating different binders with ground blast furnace slag, fly ash and/or silica fume to partially replace Portland cement are lower, and the connected porosities are much higher. Different binders assume little impact on the hydration, but can optimize the interface transition zone of pervious concrete. Meanwhile, the connected porosity plays the key role in the properties of pervious concrete. Besides, pervious concretes with steel slag and different binders can assume good comprehensive properties.