Fig. 1: Design gradation curve of the materials and statistical correlations of the laboratory test results.

a Aggregate gradation of PCBM (cumulative mass percentage). b Results of the correlation analysis of the various indices of PCBMs. Where PCBM represents permeable cement-stabilized base material, K represents the coefficient of permeability, P represents the porosity, F represents the compaction force, C represents the cement content, and \({{{{{\rm{\sigma }}}}}}\) represents the unconfined compressive strength.