In this paper, a new type of crushed-rock high-polymer composite material is proposed. This material not only retains the porous characteristics of crushed rock but also enhances the integrity of crushed rock and has excellent engineering characteristics in terms of water permeability and scouring resistance. Through the developed indoor scouring test system and pavement permeameter, the scouring resistance and water permeability of the composites were studied, and the effects of the material mixture ratio (high polymer: crushed rock), the particle size of the crushed rock and the flow rate were analysed. The results showed that the crushed-rock high-polymer composites had large pores and good water permeability. The water permeability of the composites increased with the increase in the particle size of the crushed rock and decreased with the increase in the material mixture ratio, but the decrease was insignificant. The high polymer in the composite material made the crushed-rock particles cemented to form a whole from point stability to block stability, which could resist the scouring of high-speed flow and had excellent scouring resistance. With an increase in the particle size of the crushed rock and the material mixture ratio, no erosion occurred in the composites, thereby indicating that increasing the particle size of the crushed rock and the material mixture ratio would improve the scouring resistance of the composites.
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