Towards Circular Concrete

Abstract

The construction industry significantly contributes to environmental degradation, primarily through concrete production, which accounts for substantial CO₂ emissions, resource depletion, and waste generation. This dissertation investigates the use of recycled aggregates within a circular economy framework as a sustainable alternative to natural aggregates. It employs innovative recycling technologies to enhance aggregate quality and validate the feasibility of fully replacing natural aggregates while ensuring comparable mechanical and durability properties under both laboratory and industrial-scale conditions. Additionally, it examines the impact of residual mortar on the performance of recycled coarse aggregates and analyzes the influence of contaminants on aggregate classification and concrete performance. A novel aspect of this research is the introduction of RFID-based material passports to enhance traceability, transparency, and quality control in the circular supply chain. By demonstrating the technical feasibility and industrial applicability of recycled aggregates, this dissertation advances circular construction practices. Ultimately, it contributes to reducing resource depletion and carbon emissions in concrete construction, aligning with global sustainability goals.