Abstract
Recycling construction waste into subgrade materials is an effective way to build eco-friendly highways. To assess the saturation and leaching characteristics of recycled aggregates in subgrade application scenario, leaching tests were conducted, and a numerical model was used to analyze pollution migration. Results showed that three selected typical hazardous elements (Cd, Pb, and As) exhibited different characteristics in various physical conditions, but all their concentrations remained within safe limits. Moreover, the compaction degree demonstrated an inverse relationship with initial concentrations in the multilayer leaching process. During the migration of pollutants in the subgrade, pollutants accumulated near the slope initially and gradually diffused to the bottom, then penetrated into the foundation with a migration interface in an arc shape approximately, ultimately leading to a significant accumulation area with high concentrations. The initial concentration and subgrade dispersion coefficients showed opposite effects on the pollutants migration.
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