| a | Curve-fitting parameters in equation (1) of constitutive equation |
| fcu | Cube compressive strength |
| NAC | Natural aggregates concrete |
| r | Recycled coarse aggregates replacement ratio [%] |
| RAC | Recycled aggregate concrete |
| RAC-r | Recycled aggregate concrete with various coarse replacement ratios |
| Rs | Residual strength of concrete |
| Rsr | Residual strength of concrete with various coarse replacement ratios |
| R0 | Residual strength of natural aggregate concrete |
| s | Displacement of direct shear |
| t | Age of concrete |
| V | Shear force |
| Vt | Shear force of specimen at various days of age |
| Vu | Peak shear force |
| V28 | Shear force of specimen at 28 days of age |
| ξ | Compression-shear coefficient |
| τu | Shear strength of concrete |
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