BARCA identifies a significant potential for transition to a more sustainable supply chain by focusing on the intermediate layer of roadways in particular.
While pavement materials (pavers, tiles, and bricks) are popular products in reuse chains, and road foundations have long been made from low-quality construction debris, the intermediate layer still lacks a circular alternative. Primary materials, such as river sand and crushed stone, continue to dominate this field.

BARCA proposes a circular alternative for this intermediate layer, utilizing concrete aggregates that can meet all technical requirements. These fine fractions, being less commonly used in the concrete industry, represent a substantial available resource.

BARCA suggests creating a temporary company to purchase the material, as well as to conduct research and develop a pop-up store with workshops. Additionally, an exhibition or publication will be established to document these activities.