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Recycled concrete aggregate (RCA) is a typical construction and demolition (CD) material generated in civil engineering activities and has been widely used as the coarse-grained filler added to sand for roadbed fillings. The effect of RCA content on the mechanical behavior of sand-RCA mixtures is complicated and still not fully understood. To explore the effect of RCA content on the macroscale and microscopic behavior of the sand-RCA mixtures with various RCA contents, laboratory direct shear tests and numerical simulations using t