Assessing the environmental and technical feasibility of re-valorization of demolished road material constructed from dredged sediments

In line with circular economy principles, particularly the concept of “closing the loop”, this study examines the basic physicochemical and short-term mechanical viability of revalorization of waste road materials, specifically recycled sediments (RSD), for secondary use as subbase materials. Geotechnical and environmental characteristics of RSD were analyzed to assess its material evolution in comparison to raw sediments (SD) and to explore its environmental potential under varying pH conditions, applied with the intention of simulating diverse treatment and environmental scenarios. This analysis aimed to provide insight into the differing outcomes of SD valorization and RSD revalorization across the different road types of uses (paved road construction, covered embankments, and unpaved/uncapped road construction). RSD demonstrates enhanced short-term mechanical properties, with higher Immediate California Bearing Ratio (I-CBR) than SD for road use. However, the environmental assessment reveals potential contamination constraints. This research showed that the recycled road material or recycled sediments exhibits enhanced mechanical properties, indicating an increased potential for revalorization despite certain additional environmental constraints.

Graphical abstract