Enhancing the chemical performance of phosphogypsum as a road base material by blending with common aggregates

•Increased PG production demands a sustainable alternative disposal scenario.•PG-aggregate base blends reduced total and leachable constituent concentrations.•Total and leachable concentrations from blends vary with source and aggregate.•Blending provides a more chemically suitable base material than PG alone.•Valorization of PG as a construction material enhances sustainability.