The first experimental study on mechanical properties of slag aggregate concrete (SAC) prepared with coarse slag aggregates of different size.

The size of coarse aggregates influences the properties of both normal- and high-strength SACs.

Concretes prepared with larger slag aggregates exhibit higher mechanical properties than those with smaller aggregates.

The compressive strength, elastic modulus, and splitting tensile strength of SACs decrease with increasing slag aggregate content.

This reduction is not very significant in normal-strength concrete even at full replacement of natural aggregates with slag aggregates.